Web traffic anonymizers for analysts.

• Anonymouse.org - A free, web based anonymizer.
• OpenVPN - VPN software and hosting solutions.
• Privoxy - An open source proxy server with some
  privacy features.
• Tor - The Onion Router, for browsing the web
  without leaving traces of the client IP.

Trap and collect your own samples.

• Conpot - ICS/SCADA honeypot.
• Cowrie - SSH honeypot, based
  on Kippo.
• DemoHunter - Low interaction Distributed Honeypots.
• Dionaea - Honeypot designed to trap malware.
• Glastopf - Web application honeypot.
• Honeyd - Create a virtual honeynet.
• HoneyDrive - Honeypot bundle Linux distro.
• Honeytrap - Opensource system for running, monitoring and managing honeypots.
• MHN - MHN is a centralized server for management and data collection of honeypots. MHN allows you to deploy sensors quickly and to collect data immediately, viewable from a neat web interface.
• Mnemosyne - A normalizer for
  honeypot data; supports Dionaea.
• Thug - Low interaction honeyclient, for
  investigating malicious websites.

Malware samples collected for analysis.

• Clean MX - Realtime
  database of malware and malicious domains.
• Contagio - A collection of recent
  malware samples and analyses.
• Exploit Database - Exploit and shellcode
  samples.
• Infosec - CERT-PA - Malware samples collection and analysis.
• InQuest Labs - Evergrowing searchable corpus of malicious Microsoft documents.
• Javascript Mallware Collection - Collection of almost 40.000 javascript malware samples
• Malpedia - A resource providing
  rapid identification and actionable context for malware investigations.
• Malshare - Large repository of malware actively
  scrapped from malicious sites.
• Ragpicker - Plugin based malware
  crawler with pre-analysis and reporting functionalities
• theZoo - Live malware samples for
  analysts.
• Tracker h3x - Agregator for malware corpus tracker
  and malicious download sites.
• vduddu malware repo - Collection of
  various malware files and source code.
• VirusBay - Community-Based malware repository and social network.
• ViruSign - Malware database that detected by
  many anti malware programs except ClamAV.
• VirusShare - Malware repository, registration
  required.
• VX Vault - Active collection of malware samples.
• Zeltser's Sources - A list
  of malware sample sources put together by Lenny Zeltser.
• Zeus Source Code - Source for the Zeus
  trojan leaked in 2011.
• VX Underground - Massive and growing collection of free malware samples.

Harvest and analyze IOCs.

• AbuseHelper - An open-source
  framework for receiving and redistributing abuse feeds and threat intel.
• AlienVault Open Threat Exchange - Share and
  collaborate in developing Threat Intelligence.
• Combine - Tool to gather Threat
  Intelligence indicators from publicly available sources.
• Fileintel - Pull intelligence per file hash.
• Hostintel - Pull intelligence per host.
• IntelMQ -
  A tool for CERTs for processing incident data using a message queue.
• IOC Editor -
  A free editor for XML IOC files.
• iocextract - Advanced Indicator
  of Compromise (IOC) extractor, Python library and command-line tool.
• ioc_writer - Python library for
  working with OpenIOC objects, from Mandiant.
• MalPipe - Malware/IOC ingestion and
  processing engine, that enriches collected data.
• Massive Octo Spice -
  Previously known as CIF (Collective Intelligence Framework). Aggregates IOCs
  from various lists. Curated by the
  CSIRT Gadgets Foundation.
• MISP - Malware Information Sharing
  Platform curated by The MISP Project.
• Pulsedive - Free, community-driven threat intelligence platform collecting IOCs from open-source feeds.
• PyIOCe - A Python OpenIOC editor.
• RiskIQ - Research, connect, tag and
  share IPs and domains. (Was PassiveTotal.)
• threataggregator -
  Aggregates security threats from a number of sources, including some of
  those listed below in other resources.
• ThreatConnect - TC Open allows you to see and
  share open source threat data, with support and validation from our free community.
• ThreatCrowd - A search engine for threats,
  with graphical visualization.
• ThreatIngestor - Build
  automated threat intel pipelines sourcing from Twitter, RSS, GitHub, and
  more.
• ThreatTracker - A Python
  script to monitor and generate alerts based on IOCs indexed by a set of
  Google Custom Search Engines.
• TIQ-test - Data visualization
  and statistical analysis of Threat Intelligence feeds.

Threat intelligence and IOC resources.

• Autoshun (list) -
  Snort plugin and blocklist.
• Bambenek Consulting Feeds -
  OSINT feeds based on malicious DGA algorithms.
• Fidelis Barncat -
  Extensive malware config database (must request access).
• CI Army (list) -
  Network security blocklists.
• Critical Stack- Free Intel Market - Free
  intel aggregator with deduplication featuring 90+ feeds and over 1.2M indicators.
• Cybercrime tracker - Multiple botnet active tracker.
• FireEye IOCs - Indicators of Compromise
  shared publicly by FireEye.
• FireHOL IP Lists - Analytics for 350+ IP lists
  with a focus on attacks, malware and abuse. Evolution, Changes History,
  Country Maps, Age of IPs listed, Retention Policy, Overlaps.
• HoneyDB - Community driven honeypot sensor data collection and aggregation.
• hpfeeds - Honeypot feed protocol.
• Infosec - CERT-PA lists (IPs - Domains - URLs) - Blocklist service.
• InQuest REPdb - Continuous aggregation of IOCs from a variety of open reputation sources.
• InQuest IOCdb - Continuous aggregation of IOCs from a variety of blogs, Github repos, and Twitter.
• Internet Storm Center (DShield) - Diary and
  searchable incident database, with a web API.
  (unofficial Python library).
• malc0de - Searchable incident database.
• Malware Domain List - Search and share
  malicious URLs.
• MetaDefender Threat Intelligence Feed -
  List of the most looked up file hashes from MetaDefender Cloud.
• OpenIOC - Framework for sharing threat intelligence.
• Proofpoint Threat Intelligence -
  Rulesets and more. (Formerly Emerging Threats.)
• Ransomware overview -
  A list of ransomware overview with details, detection and prevention.
• STIX - Structured Threat Information eXpression -
  Standardized language to represent and share cyber threat information.
  Related efforts from MITRE:
  • CAPEC - Common Attack Pattern Enumeration and Classification
  • CybOX - Cyber Observables eXpression
  • MAEC - Malware Attribute Enumeration and Characterization
  • TAXII - Trusted Automated eXchange of Indicator Information
• SystemLookup - SystemLookup hosts a collection of lists that provide information on
  the components of legitimate and potentially unwanted programs.
• ThreatMiner - Data mining portal for threat
  intelligence, with search.
• threatRECON - Search for indicators, up to 1000
  free per month.
• ThreatShare - C2 panel tracker
• Yara rules - Yara rules repository.
• YETI - Yeti is a platform meant to organize observables, indicators of compromise, TTPs, and knowledge on threats in a single, unified repository.
• ZeuS Tracker - ZeuS
  blocklists.

Antivirus and other malware identification tools

• AnalyzePE - Wrapper for a
  variety of tools for reporting on Windows PE files.
• Assemblyline - A scalable file triage and malware analysis system integrating the cyber security community's best tools..
• BinaryAlert - An open source, serverless
  AWS pipeline that scans and alerts on uploaded files based on a set of
  YARA rules.
• capa - Detects capabilities in executable files.
• chkrootkit - Local Linux rootkit detection.
• ClamAV - Open source antivirus engine.
• Detect It Easy(DiE) - A program for
  determining types of files.
• Exeinfo PE - Packer, compressor detector, unpack
  info, internal exe tools.
• ExifTool - Read, write and
  edit file metadata.
• File Scanning Framework -
  Modular, recursive file scanning solution.
• fn2yara - FN2Yara is a tool to generate
  Yara signatures for matching functions (code) in an executable program.
• Generic File Parser - A Single Library Parser to extract meta information,static analysis and detect macros within the files.
• hashdeep - Compute digest hashes with
  a variety of algorithms.
• HashCheck - Windows shell extension
  to compute hashes with a variety of algorithms.
• Loki - Host based scanner for IOCs.
• Malfunction - Catalog and
  compare malware at a function level.
• Manalyze - Static analyzer for PE
  executables.
• MASTIFF - Static analysis
  framework.
• MultiScanner - Modular file
  scanning/analysis framework
• Nauz File Detector(NFD) - Linker/Compiler/Tool detector for Windows, Linux and MacOS.
• nsrllookup - A tool for looking
  up hashes in NIST's National Software Reference Library database.
• packerid - A cross-platform
  Python alternative to PEiD.
• PE-bear - Reversing tool for PE
  files.
• PEframe - PEframe is an open source tool to perform static analysis on Portable Executable malware and malicious MS Office documents.
• PEV - A multiplatform toolkit to work with PE
  files, providing feature-rich tools for proper analysis of suspicious binaries.
• PortEx - Java library to analyse PE files with a special focus on malware analysis and PE malformation robustness.
• Quark-Engine - An Obfuscation-Neglect Android Malware Scoring System
• Rootkit Hunter - Detect Linux rootkits.
• ssdeep - Compute fuzzy hashes.
• totalhash.py -
  Python script for easy searching of the TotalHash.cymru.com
  database.
• TrID - File identifier.
• YARA - Pattern matching tool for
  analysts.
• Yara rules generator - Generate
  yara rules based on a set of malware samples. Also contains a good
  strings DB to avoid false positives.
• Yara Finder - A simple tool to yara match the file against various yara rules to find the indicators of suspicion.

Web-based multi-AV scanners, and malware sandboxes for automated analysis.

• anlyz.io - Online sandbox.
• any.run - Online interactive sandbox.
• AndroTotal - Free online analysis of APKs
  against multiple mobile antivirus apps.
• BoomBox - Automatic deployment of Cuckoo
  Sandbox malware lab using Packer and Vagrant.
• Cryptam - Analyze suspicious office documents.
• Cuckoo Sandbox - Open source, self hosted
  sandbox and automated analysis system.
• cuckoo-modified - Modified
  version of Cuckoo Sandbox released under the GPL. Not merged upstream due to
  legal concerns by the author.
• cuckoo-modified-api - A
  Python API used to control a cuckoo-modified sandbox.
• DeepViz - Multi-format file analyzer with
  machine-learning classification.
• detux - A sandbox developed to do
  traffic analysis of Linux malwares and capturing IOCs.
• DRAKVUF - Dynamic malware analysis
  system.
• filescan.io - Static malware analysis, VBA/Powershell/VBS/JS Emulation
• firmware.re - Unpacks, scans and analyzes almost any
  firmware package.
• HaboMalHunter - An Automated Malware
  Analysis Tool for Linux ELF Files.
• Hybrid Analysis - Online malware
  analysis tool, powered by VxSandbox.
• Intezer - Detect, analyze, and categorize malware by
  identifying code reuse and code similarities.
• IRMA - An asynchronous and customizable
  analysis platform for suspicious files.
• Joe Sandbox - Deep malware analysis with Joe Sandbox.
• Jotti - Free online multi-AV scanner.
• Limon - Sandbox for Analyzing Linux Malware.
• Malheur - Automatic sandboxed analysis
  of malware behavior.
• malice.io - Massively scalable malware analysis framework.
• malsub - A Python RESTful API framework for
  online malware and URL analysis services.
• Malware config - Extract, decode and display online
  the configuration settings from common malwares.
• MalwareAnalyser.io - Online malware anomaly-based static analyser with heuristic detection engine powered by data mining and machine learning.
• Malwr - Free analysis with an online Cuckoo Sandbox
  instance.
• MetaDefender Cloud - Scan a file, hash, IP, URL or
  domain address for malware for free.
• NetworkTotal - A service that analyzes
  pcap files and facilitates the quick detection of viruses, worms, trojans, and all
  kinds of malware using Suricata configured with EmergingThreats Pro.
• Noriben - Uses Sysinternals Procmon to
  collect information about malware in a sandboxed environment.
• PacketTotal - PacketTotal is an online engine for analyzing .pcap files, and visualizing the network traffic within.
• PDF Examiner - Analyse suspicious PDF files.
• ProcDot - A graphical malware analysis tool kit.
• Recomposer - A helper
  script for safely uploading binaries to sandbox sites.
• sandboxapi - Python library for
  building integrations with several open source and commercial malware sandboxes.
• SEE - Sandboxed Execution Environment (SEE)
  is a framework for building test automation in secured Environments.
• SEKOIA Dropper Analysis - Online dropper analysis (Js, VBScript, Microsoft Office, PDF).
• VirusTotal - Free online analysis of malware
  samples and URLs
• Visualize_Logs - Open source
  visualization library and command line tools for logs. (Cuckoo, Procmon, more
  to come...)
• Zeltser's List - Free
  automated sandboxes and services, compiled by Lenny Zeltser.

Inspect domains and IP addresses.

• AbuseIPDB - AbuseIPDB is a project dedicated
  to helping combat the spread of hackers, spammers, and abusive activity on the internet.
• badips.com - Community based IP blacklist service.
• boomerang - A tool designed
  for consistent and safe capture of off network web resources.
• Cymon - Threat intelligence tracker, with IP/domain/hash
  search.
• Desenmascara.me - One click tool to retrieve as
  much metadata as possible for a website and to assess its good standing.
• Dig - Free online dig and other
  network tools.
• dnstwist - Domain name permutation
  engine for detecting typo squatting, phishing and corporate espionage.
• IPinfo - Gather information
  about an IP or domain by searching online resources.
• Machinae - OSINT tool for
  gathering information about URLs, IPs, or hashes. Similar to Automator.
• mailchecker - Cross-language
  temporary email detection library.
• MaltegoVT - Maltego transform
  for the VirusTotal API. Allows domain/IP research, and searching for file
  hashes and scan reports.
• Multi rbl - Multiple DNS blacklist and forward
  confirmed reverse DNS lookup over more than 300 RBLs.
• NormShield Services - Free API Services
  for detecting possible phishing domains, blacklisted ip addresses and breached
  accounts.
• PhishStats - Phishing Statistics with search for
  IP, domain and website title
• Spyse - subdomains, whois, realted domains, DNS, hosts AS, SSL/TLS info,
• SecurityTrails - Historical and current WHOIS,
  historical and current DNS records, similar domains, certificate information
  and other domain and IP related API and tools.
• SpamCop - IP based spam block list.
• SpamHaus - Block list based on
  domains and IPs.
• Sucuri SiteCheck - Free Website Malware
  and Security Scanner.
• Talos Intelligence - Search for IP, domain
  or network owner. (Previously SenderBase.)
• TekDefense Automater - OSINT tool
  for gathering information about URLs, IPs, or hashes.
• URLhaus - A project from abuse.ch with the goal
  of sharing malicious URLs that are being used for malware distribution.
• URLQuery - Free URL Scanner.
• urlscan.io - Free URL Scanner & domain information.
• Whois - DomainTools free online whois
  search.
• Zeltser's List - Free
  online tools for researching malicious websites, compiled by Lenny Zeltser.
• ZScalar Zulu - Zulu URL Risk Analyzer.

Analyze malicious URLs. See also the domain analysis and
documents and shellcode sections.

• Bytecode Viewer - Combines
  multiple Java bytecode viewers and decompilers into one tool, including
  APK/DEX support.
• Firebug - Firefox extension for web development.
• Java Decompiler - Decompile and inspect Java apps.
• Java IDX Parser - Parses Java
  IDX cache files.
• JSDetox - JavaScript
  malware analysis tool.
• jsunpack-n - A javascript
  unpacker that emulates browser functionality.
• Krakatau - Java decompiler,
  assembler, and disassembler.
• Malzilla - Analyze malicious web pages.
• RABCDAsm - A "Robust
  ActionScript Bytecode Disassembler."
• SWF Investigator -
  Static and dynamic analysis of SWF applications.
• swftools - Tools for working with Adobe Flash
  files.
• xxxswf - A
  Python script for analyzing Flash files.

Analyze malicious JS and shellcode from PDFs and Office documents. See also
the browser malware section.

• AnalyzePDF - A tool for
  analyzing PDFs and attempting to determine whether they are malicious.
• box-js - A tool for studying JavaScript
  malware, featuring JScript/WScript support and ActiveX emulation.
• diStorm - Disassembler for analyzing
  malicious shellcode.
• InQuest Deep File Inspection - Upload common malware lures for Deep File Inspection and heuristical analysis.
• JS Beautifier - JavaScript unpacking and deobfuscation.
• libemu - Library and tools for x86 shellcode
  emulation.
• malpdfobj - Deconstruct malicious PDFs
  into a JSON representation.
• OfficeMalScanner - Scan for
  malicious traces in MS Office documents.
• olevba - A script for parsing OLE
  and OpenXML documents and extracting useful information.
• Origami PDF - A tool for
  analyzing malicious PDFs, and more.
• PDF Tools - pdfid,
  pdf-parser, and more from Didier Stevens.
• PDF X-Ray Lite - A PDF analysis tool,
  the backend-free version of PDF X-RAY.
• peepdf - Python
  tool for exploring possibly malicious PDFs.
• QuickSand - QuickSand is a compact C framework
  to analyze suspected malware documents to identify exploits in streams of different
  encodings and to locate and extract embedded executables.
• Spidermonkey -
  Mozilla's JavaScript engine, for debugging malicious JS.

For extracting files from inside disk and memory images.

• bulk_extractor - Fast file
  carving tool.
• EVTXtract - Carve Windows
  Event Log files from raw binary data.
• Foremost - File carving tool designed
  by the US Air Force.
• hachoir3 - Hachoir is a Python library
  to view and edit a binary stream field by field.
• Scalpel - Another data carving
  tool.
• SFlock - Nested archive
  extraction/unpacking (used in Cuckoo Sandbox).

Reverse XOR and other code obfuscation methods.

• Balbuzard - A malware
  analysis tool for reversing obfuscation (XOR, ROL, etc) and more.
• de4dot - .NET deobfuscator and
  unpacker.
• ex_pe_xor
  & iheartxor -
  Two tools from Alexander Hanel for working with single-byte XOR encoded
  files.
• FLOSS - The FireEye Labs Obfuscated
  String Solver uses advanced static analysis techniques to automatically
  deobfuscate strings from malware binaries.
• NoMoreXOR - Guess a 256 byte
  XOR key using frequency analysis.
• PackerAttacker - A generic
  hidden code extractor for Windows malware.
• PyInstaller Extractor -
  A Python script to extract the contents of a PyInstaller generated Windows
  executable file. The contents of the pyz file (usually pyc files) present
  inside the executable are also extracted and automatically fixed so that a
  Python bytecode decompiler will recognize it.
• uncompyle6 - A cross-version
  Python bytecode decompiler. Translates Python bytecode back into equivalent
  Python source code.
• un{i}packer - Automatic and
  platform-independent unpacker for Windows binaries based on emulation.
• unpacker - Automated malware
  unpacker for Windows malware based on WinAppDbg.
• unxor - Guess XOR keys using
  known-plaintext attacks.
• VirtualDeobfuscator -
  Reverse engineering tool for virtualization wrappers.
• XORBruteForcer -
  A Python script for brute forcing single-byte XOR keys.
• XORSearch & XORStrings -
  A couple programs from Didier Stevens for finding XORed data.
• xortool - Guess XOR key length, as
  well as the key itself.

Disassemblers, debuggers, and other static and dynamic analysis tools.

• angr - Platform-agnostic binary analysis
  framework developed at UCSB's Seclab.
• bamfdetect - Identifies and extracts
  information from bots and other malware.
• BAP - Multiplatform and
  open source (MIT) binary analysis framework developed at CMU's Cylab.
• BARF - Multiplatform, open
  source Binary Analysis and Reverse engineering Framework.
• binnavi - Binary analysis IDE for
  reverse engineering based on graph visualization.
• Binary ninja - A reversing engineering platform
  that is an alternative to IDA.
• Binwalk - Firmware analysis tool.
• BluePill - Framework for executing and debugging evasive malware and protected executables.
• Capstone - Disassembly framework for
  binary analysis and reversing, with support for many architectures and
  bindings in several languages.
• codebro - Web based code browser using
   clang to provide basic code analysis.
• Cutter - GUI for Radare2.
• DECAF (Dynamic Executable Code Analysis Framework)
  - A binary analysis platform based   on QEMU. DroidScope is now an extension to DECAF.
• dnSpy - .NET assembly editor, decompiler
  and debugger.
• dotPeek - Free .NET Decompiler and
  Assembly Browser.
• Evan's Debugger (EDB) - A
  modular debugger with a Qt GUI.
• Fibratus - Tool for exploration
  and tracing of the Windows kernel.
• FPort - Reports
  open TCP/IP and UDP ports in a live system and maps them to the owning application.
• GDB - The GNU debugger.
• GEF - GDB Enhanced Features, for exploiters
  and reverse engineers.
• Ghidra - A software reverse engineering (SRE) framework created and maintained by the National Security Agency Research Directorate.
• hackers-grep - A utility to
  search for strings in PE executables including imports, exports, and debug
  symbols.
• Hopper - The macOS and Linux Disassembler.
• IDA Pro - Windows
  disassembler and debugger, with a free evaluation version.
• IDR - Interactive Delphi Reconstructor
  is a decompiler of Delphi executable files and dynamic libraries.
• Immunity Debugger - Debugger for
  malware analysis and more, with a Python API.
• ILSpy - ILSpy is the open-source .NET assembly browser and decompiler.
• Kaitai Struct - DSL for file formats / network protocols /
  data structures reverse engineering and dissection, with code generation
  for C++, C#, Java, JavaScript, Perl, PHP, Python, Ruby.
• LIEF - LIEF provides a cross-platform library
  to parse, modify and abstract ELF, PE and MachO formats.
• ltrace - Dynamic analysis for Linux executables.
• mac-a-mal - An automated framework
  for mac malware hunting.
• objdump - Part of GNU binutils,
  for static analysis of Linux binaries.
• OllyDbg - An assembly-level debugger for Windows
  executables.
• OllyDumpEx - Dump memory
  from (unpacked) malware Windows process and store raw or rebuild PE file.
  This is a plugin for OllyDbg, Immunity Debugger, IDA Pro, WinDbg, and x64dbg.
• PANDA - Platform for Architecture-Neutral
  Dynamic Analysis.
• PEDA - Python Exploit Development
  Assistance for GDB, an enhanced display with added commands.
• pestudio - Perform static analysis of Windows
  executables.
• Pharos - The Pharos binary analysis framework
  can be used to perform automated static analysis of binaries.
• plasma - Interactive
  disassembler for x86/ARM/MIPS.
• PPEE (puppy) - A Professional PE file Explorer for
  reversers, malware researchers and those who want to statically inspect PE
  files in more detail.
• Process Explorer -
  Advanced task manager for Windows.
• Process Hacker - Tool that monitors
  system resources.
• Process Monitor -
  Advanced monitoring tool for Windows programs.
• PSTools - Windows
  command-line tools that help manage and investigate live systems.
• Pyew - Python tool for malware
  analysis.
• PyREBox - Python scriptable reverse
  engineering sandbox by the Talos team at Cisco.
• Qiling Framework - Cross platform emulation and sanboxing
  framework with instruments for binary analysis.
• QKD - QEMU with embedded WinDbg
  server for stealth debugging.
• Radare2 - Reverse engineering framework, with
  debugger support.
• RegShot - Registry compare utility
  that compares snapshots.
• RetDec - Retargetable machine-code decompiler with an
  online decompilation service and
  API that you can use in your tools.
• ROPMEMU - A framework to analyze, dissect
  and decompile complex code-reuse attacks.
• Scylla Imports Reconstructor - Find and fix
  the IAT of an unpacked / dumped PE32 malware.
• ScyllaHide - An Anti-Anti-Debug library
  and plugin for OllyDbg, x64dbg, IDA Pro, and TitanEngine.
• SMRT - Sublime Malware Research Tool, a
  plugin for Sublime 3 to aid with malware analyis.
• strace - Dynamic analysis for
  Linux executables.
• StringSifter - A machine learning tool
  that automatically ranks strings based on their relevance for malware analysis.
• Triton - A dynamic binary analysis (DBA) framework.
• Udis86 - Disassembler library and tool
  for x86 and x86_64.
• Vivisect - Python tool for
  malware analysis.
• WinDbg - multipurpose debugger for the Microsoft Windows computer operating system, used to debug user mode applications, device drivers, and the kernel-mode memory dumps.
• X64dbg - An open-source x64/x32 debugger for windows.

Analyze network interactions.

• Bro - Protocol analyzer that operates at incredible
  scale; both file and network protocols.
• BroYara - Use Yara rules from Bro.
• CapTipper - Malicious HTTP traffic
  explorer.
• chopshop - Protocol analysis and
  decoding framework.
• CloudShark - Web-based tool for packet analysis
  and malware traffic detection.
• FakeNet-NG - Next generation
  dynamic network analysis tool.
• Fiddler - Intercepting web proxy designed
  for "web debugging."
• Hale - Botnet C&C monitor.
• Haka - An open source security oriented
  language for describing protocols and applying security policies on (live)
  captured traffic.
• HTTPReplay - Library for parsing
  and reading out PCAP files, including TLS streams using TLS Master Secrets
  (used in Cuckoo Sandbox).
• INetSim - Network service emulation, useful when
  building a malware lab.
• Laika BOSS - Laika BOSS is a file-centric
  malware analysis and intrusion detection system.
• Malcolm - Malcolm is a powerful, easily
  deployable network traffic analysis tool suite for full packet capture artifacts
  (PCAP files) and Zeek logs.
• Malcom - Malware Communications
  Analyzer.
• Maltrail - A malicious traffic
  detection system, utilizing publicly available (black)lists containing
  malicious and/or generally suspicious trails and featuring an reporting
  and analysis interface.
• mitmproxy - Intercept network traffic on the fly.
• Moloch - IPv4 traffic capturing, indexing
  and database system.
• NetworkMiner - Network
  forensic analysis tool, with a free version.
• ngrep - Search through network traffic
  like grep.
• PcapViz - Network topology and
  traffic visualizer.
• Python ICAP Yara - An
  ICAP Server with yara scanner for URL or content.
• Squidmagic - squidmagic is a tool
  designed to analyze a web-based network traffic to detect central command
  and control (C&C) servers and malicious sites, using Squid proxy server and
  Spamhaus.
• Tcpdump - Collect network traffic.
• tcpick - Trach and reassemble TCP streams
  from network traffic.
• tcpxtract - Extract files from network
  traffic.
• Wireshark - The network traffic analysis
  tool.

Tools for dissecting malware in memory images or running systems.

• BlackLight - Windows/MacOS
  forensics client supporting hiberfil, pagefile, raw memory analysis.
• DAMM - Differential Analysis of
  Malware in Memory, built on Volatility.
• evolve - Web interface for the
  Volatility Memory Forensics Framework.
• FindAES - Find AES
  encryption keys in memory.
• inVtero.net - High speed memory
  analysis framework developed in .NET supports all Windows x64, includes
  code integrity and write support.
• Muninn - A script to automate portions
  of analysis using Volatility, and create a readable report.
  Orochi - Orochi is an open source framework for
  collaborative forensic memory dump analysis.
• Rekall - Memory analysis framework,
  forked from Volatility in 2013.
• TotalRecall - Script based
  on Volatility for automating various malware analysis tasks.
• VolDiff - Run Volatility on memory
  images before and after malware execution, and report changes.
• Volatility - Advanced
  memory forensics framework.
• VolUtility - Web Interface for
  Volatility Memory Analysis framework.
• WDBGARK -
  WinDBG Anti-RootKit Extension.
• WinDbg -
  Live memory inspection and kernel debugging for Windows systems.

• AChoir - A live incident response
  script for gathering Windows artifacts.
• python-evt - Python
  library for parsing Windows Event Logs.
• python-registry - Python
  library for parsing registry files.
• RegRipper
  (GitHub) -
  Plugin-based registry analysis tool.

• Aleph - Open Source Malware Analysis
  Pipeline System.
• CRITs - Collaborative Research Into Threats, a
  malware and threat repository.
• FAME - A malware analysis
  framework featuring a pipeline that can be extended with custom modules,
  which can be chained and interact with each other to perform end-to-end
  analysis.
• Malwarehouse - Store, tag, and
  search malware.
• Polichombr - A malware analysis
  platform designed to help analysts to reverse malwares collaboratively.
• stoQ - Distributed content analysis
  framework with extensive plugin support, from input to output, and everything
  in between.
• Viper - A binary management and analysis framework for
  analysts and researchers.

• al-khaser - A PoC malware
  with good intentions that aimes to stress anti-malware systems.
• CryptoKnight - Automated cryptographic algorithm reverse engineering and classification framework.
• DC3-MWCP -
  The Defense Cyber Crime Center's Malware Configuration Parser framework.
• FLARE VM - A fully customizable,
  Windows-based, security distribution for malware analysis.
• MalSploitBase - A database
  containing exploits used by malware.
• Malware Museum - Collection of
  malware programs that were distributed in the 1980s and 1990s.
• Malware Organiser - A simple tool to organise large malicious/benign files into a organised Structure.
• Pafish - Paranoid Fish, a demonstration
  tool that employs several techniques to detect sandboxes and analysis
  environments in the same way as malware families do.
• REMnux - Linux distribution and docker images for
  malware reverse engineering and analysis.
• Tsurugi Linux - Linux distribution designed to support your DFIR investigations, malware analysis and OSINT (Open Source INTelligence) activities.
• Santoku Linux - Linux distribution for mobile
  forensics, malware analysis, and security.

Resources

Essential malware analysis reading material.

• Learning Malware Analysis - Learning Malware Analysis: Explore the concepts, tools, and techniques to analuze and investigate Windows malware
• Malware Analyst's Cookbook and DVD -
  Tools and Techniques for Fighting Malicious Code.
• Mastering Malware Analysis - Mastering Malware Analysis: The complete malware analyst's guide to combating malicious software, APT, cybercime, and IoT attacks
• Mastering Reverse Engineering - Mastering Reverse Engineering: Re-engineer your ethical hacking skills
• Practical Malware Analysis - The Hands-On
  Guide to Dissecting Malicious Software.
• Practical Reverse Engineering -
  Intermediate Reverse Engineering.
• Real Digital Forensics - Computer
  Security and Incident Response.
• Rootkits and Bootkits - Rootkits and Bootkits: Reversing Modern Malware and Next Generation Threats
• The Art of Memory Forensics - Detecting
  Malware and Threats in Windows, Linux, and Mac Memory.
• The IDA Pro Book - The Unofficial Guide
  to the World's Most Popular Disassembler.
• The Rootkit Arsenal - The Rootkit Arsenal:
  Escape and Evasion in the Dark Corners of the System

• APT Notes - A collection of papers
  and notes related to Advanced Persistent Threats.
• Ember - Endgame Malware BEnchmark for Research,
  a repository that makes it easy to (re)create a machine learning model that can be used
  to predict a score for a PE file based on static analysis.
• File Formats posters - Nice visualization
  of commonly used file format (including PE & ELF).
• Honeynet Project - Honeypot tools, papers, and
  other resources.
• Kernel Mode - An active community
  devoted to malware analysis and kernel development.
• Malicious Software - Malware
  blog and resources by Lenny Zeltser.
• Malware Analysis Search -
  Custom Google search engine from Corey Harrell.
• Malware Analysis Tutorials -
  The Malware Analysis Tutorials by Dr. Xiang Fu, a great resource for learning
  practical malware analysis.
• Malware Analysis, Threat Intelligence and Reverse Engineering -
  Presentation introducing the concepts of malware analysis, threat intelligence
  and reverse engineering. Experience or prior knowledge is not required. Labs
  link in description.
• Malware Persistence - Collection
  of various information focused on malware persistence: detection (techniques),
  response, pitfalls and the log collection (tools).
• Malware Samples and Traffic - This
  blog focuses on network traffic related to malware infections.
• Malware Search+++ Firefox extension allows
  you to easily search some of the most popular malware databases
• Practical Malware Analysis Starter Kit -
  This package contains most of the software referenced in the Practical Malware
  Analysis book.
• RPISEC Malware Analysis - These are the
  course materials used in the Malware Analysis course at at Rensselaer Polytechnic
  Institute during Fall 2015.
• WindowsIR: Malware - Harlan
  Carvey's page on Malware.
• Windows Registry specification -
  Windows registry file format specification.
• /r/csirt_tools - Subreddit for CSIRT
  tools and resources, with a
  malware analysis flair.
• /r/Malware - The malware subreddit.
• /r/ReverseEngineering -
  Reverse engineering subreddit, not limited to just malware.

Related Awesome Lists

• Android Security
• AppSec
• CTFs
• Executable Packing
• Forensics
• "Hacking"
• Honeypots
• Industrial Control System Security
• Incident-Response
• Infosec
• PCAP Tools
• Pentesting
• Security
• Threat Intelligence
• YARA

Contributing

Pull requests and issues with suggestions are welcome! Please read the
CONTRIBUTING guidelines before submitting a PR.

Thanks

This list was made possible by:

• Lenny Zeltser and other contributors for developing REMnux, where I
  found many of the tools in this list;
• Michail Hale Ligh, Steven Adair, Blake Hartstein, and Mather Richard for
  writing the Malware Analyst's Cookbook, which was a big inspiration for
  creating the list;
• And everyone else who has sent pull requests or suggested links to add here!

Thanks!