HAMMERTOSS is a backdoor that was used by APT29 in 2015. [1] [2]

ID: S0037
Associated Software: HammerDuke, NetDuke

Platforms: Windows

Version: 1.0

Techniques Used

EnterpriseT1024Custom Cryptographic ProtocolBefore being appended to image files, HAMMERTOSS commands are encrypted with a key composed of both a hard-coded value and a string contained on that day's tweet. To decrypt the commands, an investigator would need access to the intended malware sample, the day's tweet, and the image file containing the command.[1]
EnterpriseT1001Data ObfuscationHAMMERTOSS is controlled via commands that are appended to image files.[1]
EnterpriseT1048Exfiltration Over Alternative ProtocolHAMMERTOSS exfiltrates data by uploading it to accounts created by the actors on Web cloud storage providers for the adversaries to retrieve later.[1]
EnterpriseT1086PowerShellHAMMERTOSS is known to use PowerShell.[1]
EnterpriseT1071Standard Application Layer ProtocolThe "Uploader" variant of HAMMERTOSS visits a hard-coded server over HTTP/S to download the images HAMMERTOSS uses to receive commands.[1]
EnterpriseT1102Web ServiceThe "tDiscoverer" variant of HAMMERTOSS establishes a C2 channel by downloading resources from Web services like Twitter and GitHub. HAMMERTOSS binaries contain an algorithm that generates a different Twitter handle for the malware to check for instructions every day.[1]


Groups that use this software: