[![Logo](https://www.paloaltonetworks.com/wp-content/uploads/2021/07/PANW_Parent.png)](https://www.paloaltonetworks.com/) [![Unit42 Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/unit42-logo-white.svg)](https://unit42.paloaltonetworks.com/) Menu * [Tools](https://unit42.paloaltonetworks.com/tools/) * [ATOMs](https://unit42.paloaltonetworks.com/atoms/) * [Security Consulting](https://www.paloaltonetworks.com/unit42) * [About Us](https://unit42.paloaltonetworks.com/about-unit-42/) * [**Under Attack?**](https://start.paloaltonetworks.com/contact-unit42.html) * [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") * [Trend Reports](https://unit42.paloaltonetworks.com/category/trend-reports/ "Trend Reports") * [Malware](https://unit42.paloaltonetworks.com/category/malware/ "Malware") [Malware](https://unit42.paloaltonetworks.com/category/malware/) # New Release: Decrypting NetWire C2 Traffic ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 3 min read * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Phil Da Silva](https://unit42.paloaltonetworks.com/author/phil-da-silva/) * [Rob Downs](https://unit42.paloaltonetworks.com/author/rob-downs/) * [Ryan Olson](https://unit42.paloaltonetworks.com/author/ryan-olson/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:August 4, 2014 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Malware](https://unit42.paloaltonetworks.com/category/malware/) * [Trend Reports](https://unit42.paloaltonetworks.com/category/trend-reports/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [419 Scam](https://unit42.paloaltonetworks.com/tag/419-scam/) * [NetWire](https://unit42.paloaltonetworks.com/tag/netwire/) * [Research](https://unit42.paloaltonetworks.com/tag/research/) * [Tool](https://unit42.paloaltonetworks.com/tag/tool/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/new-release-decrypting-netwire-c2-traffic/?pdf=download&lg=en&_wpnonce=c280d701ab "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/new-release-decrypting-netwire-c2-traffic/?pdf=print&lg=en&_wpnonce=c280d701ab "Click here to print") Share![Down arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/down-arrow.svg) * ![Link 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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=New%20Release:%20Decrypting%20NetWire%20C2%20Traffic%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fnew-release-decrypting-netwire-c2-traffic%2F "Share in Mastodon") On July 22, Palo Alto Networks threat intelligence team, Unit 42, released our first report on the evolution of "[Silver Spaniel](https://connect.paloaltonetworks.com/adversary-report)" 419 scammers. Of particular note is how these actors use a Remote Administration Tool (RAT) named NetWire (part of the NetWiredRC malware family). This RAT gives a remote attacker complete control over a Windows, Mac OS X, or Linux system through a simple graphical user interface. To better understand this RAT, our team reverse engineered the communication protocol that NetWire uses. Today we have released [a tool](https://github.com/pan-unit42/public_tools/tree/master/netwire) that decrypts NetWire traffic and outputs any commands issued by the attacker. ### NetWire Encrytion Protocol NetWire uses a custom, TCP-based protocol. The producer of the NetWire WorldWiredLabs, states that the tool uses [256-bit AES encryption](https://www.worldwiredlabs.com/netwire-features/security/), which we found to be accurate. The tool generates two encryption keys using a static password that the attacker chooses when creating the NetWire binary. Each packet has the following structure: \< 4 Byte Little-Endian length \> \< 1 Byte Command \> \< Data \> The shortest possible packet is the "HeartBeat" command, which NetWire generates every 10 seconds. ![pic 1](https://unit42.paloaltonetworks.com/wp-content/uploads/2014/08/pic-1.png) ### Key Generation The initial packet from the client to the server shows a data and command length of 65 bytes (0x41 listed at the beginning of the packet) with a command byte of 0x03. ![pic 2\_](http://blog.paloaltonetworks.com/wp-content/uploads/2014/08/pic-2_-500x132.png) Within that data is a 32-byte seed value followed by a 16-byte initialization vector (IV) value. The client then combines the 32-byte seed value with the static password in a predetermined fashion to form an AES key. Upon receiving the initial packet, the server uses the seed value and password to generate the client's session key. It then generates its own 32-byte seed value to create it's own session key and sends the seed value to the client. The client combines this with the password and generates the same key. At this point, the key exchange is complete and both client and server hold the same two keys, which they can use to encrypt and decrypt traffic. With the two keys in place, the malware uses the AES algorithm to encrypt traffic using Output Feedback (OFB) mode (Picture courtesy of Wikipedia). The output of the block cipher encryption is eXclusive OR'ed (XOR'd) with 16 bytes of ciphertext to decrypt. Each subsequent block of ciphertext will use the previous encrypted data as the IV passed into the block cipher encryption function. ![pic 3](http://blog.paloaltonetworks.com/wp-content/uploads/2014/08/pic-3-500x201.png) ### Command Parsing The malware has a full suite of possible commands, 76 to be exact. Upon receipt of a command from the server, a single function is called to decrypt the payload data and execute the received instruction. The value in the command byte determines which of the commands is run through a 76 way switch statement. A complete list of the possible commands available in NetWire was [documented by CIRCL](https://www.circl.lu/pub/tr-23/) in April. ![pic 4](http://blog.paloaltonetworks.com/wp-content/uploads/2014/08/pic-4-500x110.png) ### NetWire Decoder The [NetWire decoder](https://github.com/pan-unit42/public_tools/tree/master/netwire) uses data from a packet capture file to generate the client and server session keys then decode the remaining encrypted packets. The user needs to know the IP of the infected client, the port used by malware and the encryption password to properly decode the traffic. This password is set to "Password" by default, but can be retrieved from NetWire binaries if the attacker used something more secure. The usage for the tool is show below. ![pic 5](http://blog.paloaltonetworks.com/wp-content/uploads/2014/08/pic-5-500x205.png) At this time the tool works against the latest version of NetWire, 1.5c. We hope this tool will be valuable to incident responders and others who are plagued by NetWire infections. Back to top ### Tags * [419 Scam](https://unit42.paloaltonetworks.com/tag/419-scam/ "419 Scam") * [NetWire](https://unit42.paloaltonetworks.com/tag/netwire/ "NetWire") * [Research](https://unit42.paloaltonetworks.com/tag/research/ "Research") * [Tool](https://unit42.paloaltonetworks.com/tag/tool/ "Tool") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Meet the Unit 42 Team at Black Hat 2014](https://unit42.paloaltonetworks.com/meet-unit-42-team-black-hat-2014/ "Meet the Unit 42 Team at Black Hat 2014") ### Related Articles * [Open Source Tool Release: Gaining Novel AWS Access With EBS Direct APIs](https://unit42.paloaltonetworks.com/aws-ebs-direct-apis/ "article - table of contents") * [GuLoader: Malspam Campaign Installing NetWire RAT](https://unit42.paloaltonetworks.com/guloader-installing-netwire-rat/ "article - table of contents") * [SilverTerrier: 2019 Nigerian Business Email Compromise Update](https://unit42.paloaltonetworks.com/silverterrier-2019-update/ "article - table of contents") ## Related Malware Resources ![Pictorial representation of a pay-per-install threat group campaign prodiving infection service for spreading malware. A close-up of a computer circuit board with a central microchip is depicted. Red digital data streams in the form of glowing binary numbers and arrows appear to flow in and out of the chip, symbolizing data processing and transfer. The scene is illuminated with a futuristic blue and red glow.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/04_Malware_Category_1920x900-6-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) September 9, 2026 [#### Untracked Nightmares: The Threats Hiding Behind Commodity Infrastructure](https://unit42.paloaltonetworks.com/ppi-network-malware-campaign-analysis/) * [ARKTunnel](https://unit42.paloaltonetworks.com/tag/arktunnel/ "ARKTunnel") * [C2](https://unit42.paloaltonetworks.com/tag/c2/ "C2") * [CL-CRI-1171](https://unit42.paloaltonetworks.com/tag/cl-cri-1171/ "CL-CRI-1171") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ppi-network-malware-campaign-analysis/ "Untracked Nightmares: The Threats Hiding Behind Commodity Infrastructure") ![Pictorial representation of attackers using AI tools to target Latin American organizations. 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The scene is illuminated by bright urban lights and digital-like particles, creating a dynamic and futuristic atmosphere.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/AdobeStock_768915868-2-1-786x373.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) September 3, 2026 [#### Attackers Expose Ongoing AI Tool Use Targeting Organizations in Latin America](https://unit42.paloaltonetworks.com/ai-tool-use-targeting-latam-orgs/) * [Agentic AI](https://unit42.paloaltonetworks.com/tag/agentic-ai/ "Agentic AI") * [ChatGPT](https://unit42.paloaltonetworks.com/tag/chatgpt/ "ChatGPT") * [CL-CRI-1131](https://unit42.paloaltonetworks.com/tag/cl-cri-1131/ "CL-CRI-1131") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-tool-use-targeting-latam-orgs/ "Attackers Expose Ongoing AI Tool Use Targeting Organizations in Latin America") ![Pictorial representation of vishing campaigns in Microsoft Teams. A digital image of a skull formed by blue binary code on a black background, with scattered ones and zeros and digital noise, symbolizes how stealthy prompt injection attacks can exploit AI logic to bypass security controls.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/01_Malware_Category_1920x900-5-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 31, 2026 [#### Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/) * [Cloaked Ursa](https://unit42.paloaltonetworks.com/tag/cloaked-ursa/ "Cloaked Ursa") * [Entra ID](https://unit42.paloaltonetworks.com/tag/entra-id/ "Entra ID") * [Microsoft Teams](https://unit42.paloaltonetworks.com/tag/microsoft-teams/ "Microsoft Teams") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/ "Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams") ![Pictorial representation of AI-enabled malware. A vibrant digital interface displaying various icons and graphs, resembling a futuristic network or data analysis dashboard. The scene is illuminated with glowing lights and patterns.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/AdobeStock_1270203474-2-1-786x368.png) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 25, 2026 [#### The State of AI-Enabled Malware August 2026: From Brand Abuse to Agentic Execution](https://unit42.paloaltonetworks.com/ai-enabled-malware-analysis/) * [Backdoor](https://unit42.paloaltonetworks.com/tag/backdoor/ "backdoor") * [Bitcoin](https://unit42.paloaltonetworks.com/tag/bitcoin/ "Bitcoin") * [DLL hijacking](https://unit42.paloaltonetworks.com/tag/dll-hijacking/ "DLL hijacking") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-enabled-malware-analysis/ "The State of AI-Enabled Malware August 2026: From Brand Abuse to Agentic Execution") ![Pictorial representation of identity abuse through trusted communication channels. Close-up view of a digital screen displaying a glitched and pixelated image of a skull-like shape.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/02_Malware_Category_1920x900-2-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 20, 2026 [#### Identity Abuse Through Trusted Communication Channels](https://unit42.paloaltonetworks.com/communication-channel-identity-risks/) * [Authentication](https://unit42.paloaltonetworks.com/tag/authentication/ "authentication") * [Identity theft](https://unit42.paloaltonetworks.com/tag/identity-theft/ "identity theft") * [Malware](https://unit42.paloaltonetworks.com/tag/malware/ "malware") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/communication-channel-identity-risks/ "Identity Abuse Through Trusted Communication Channels") ![Pictorial representation of Kimwolf botnet malware family. Digital screen with a warning sign reading "Malware." The background features lines of computer code and graphics, creating a sense of cybersecurity threat.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/07_Malware_Category_1920x900-3-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 11, 2026 [#### Kimwolf v7: An Evolution of the Kimwolf Botnet](https://unit42.paloaltonetworks.com/kimwolf-v7-botnet-malware/) * [Android APK](https://unit42.paloaltonetworks.com/tag/android-apk/ "Android APK") * [Ethereum](https://unit42.paloaltonetworks.com/tag/ethereum/ "Ethereum") * [HTTP](https://unit42.paloaltonetworks.com/tag/http/ "HTTP") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/kimwolf-v7-botnet-malware/ "Kimwolf v7: An Evolution of the Kimwolf Botnet") ![Pictorial representatiom pf Aeternum's blockchain C2. A close-up of a computer circuit board with a central microchip is depicted. Red digital data streams in the form of glowing binary numbers and arrows appear to flow in and out of the chip. The scene is illuminated with a futuristic blue and red glow.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/04_Malware_Category_1920x900-4-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 10, 2026 [#### The Permanent Threat: Analyzing Aeternum's Blockchain-Based C2 Operations and Communications](https://unit42.paloaltonetworks.com/aeternum-blockchain-c2-analysis/) * [Aeternum](https://unit42.paloaltonetworks.com/tag/aeternum/ "Aeternum") * [Infection chain](https://unit42.paloaltonetworks.com/tag/infection-chain/ "infection chain") * [JSON](https://unit42.paloaltonetworks.com/tag/json/ "JSON") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/aeternum-blockchain-c2-analysis/ "The Permanent Threat: Analyzing Aeternum’s Blockchain-Based C2 Operations and Communications") ![Pictorial representation of ChainDrop, a self-propagating npm worm. An artistic depiction of a digital workspace featuring an open laptop with a red virus on the screen.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/03_Malware_Category_1920x900-7-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) August 6, 2026 [#### ChainDrop: Inside a Self-Propagating npm Worm](https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/) * [Blockchain](https://unit42.paloaltonetworks.com/tag/blockchain/ "blockchain") * [ChainDrop](https://unit42.paloaltonetworks.com/tag/chaindrop/ "ChainDrop") * [Claude code](https://unit42.paloaltonetworks.com/tag/claude-code/ "Claude code") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/ "ChainDrop: Inside a Self-Propagating npm Worm") ![Pictorial representation of Token-jacking. A person types on a laptop with multiple digital interface elements projected, including an "AI" icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/AdobeStock_1246251272-2-786x369.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 6, 2026 [#### Token Jacking: Cybercriminals Could Be Stealing Your AI Resources](https://unit42.paloaltonetworks.com/ai-token-jacking/) * [AI API](https://unit42.paloaltonetworks.com/tag/ai-api/ "AI API") * [AI gateway](https://unit42.paloaltonetworks.com/tag/ai-gateway/ "AI gateway") * [API keys](https://unit42.paloaltonetworks.com/tag/api-keys/ "API keys") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-token-jacking/ "Token Jacking: Cybercriminals Could Be Stealing Your AI Resources") ![Pictorial representation of malware bypassing DNS and communicating directly to IP addresses. Futuristic digital cityscape with glowing blue and orange geometric structures, resembling skyscrapers.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/07_DNS_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 4, 2026 [#### Almost Half of Malware Samples Communicate Direct to IP](https://unit42.paloaltonetworks.com/malware-bypass-dns-direct-to-ip/) * [Command and Control](https://unit42.paloaltonetworks.com/tag/command-and-control/ "Command and Control") * [D2IP](https://unit42.paloaltonetworks.com/tag/d2ip/ "D2IP") * [Exfiltration](https://unit42.paloaltonetworks.com/tag/exfiltration/ "exfiltration") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/malware-bypass-dns-direct-to-ip/ "Almost Half of Malware Samples Communicate Direct to IP") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/03/unit42-footer-subscribe-desktop.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Get updates from Unit 42 ## Peace of mind comes from staying ahead of threats. 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