Cranefly: Threat Actor Uses Previously Unseen Techniques and Tools in Stealthy Campaign

Symantec, by Broadcom Software, has discovered a previously undocumented dropper that is being used to install a new backdoor and other tools using the novel technique of reading commands from seemingly innocuous Internet Information Services (IIS) logs. The dropper (Trojan.Geppei) is being used by an actor Symantec calls Cranefly to install another piece of hitherto undocumented malware (Trojan.Danfuan) and other tools. The technique of reading commands from IIS logs is not something Symantec researchers have seen being used to date in real-world attacks.

REFERENCE: https://broadcom-software.security.com/blogs/threat-intelligence/cranefly-new-tools-technique-geppei-danfuan

TAGS: pyinstaller, trojan.geppei, trojan.danfuan, wrde, cllo, exco, regeorg, malicious http requests

ADVERSARY: Cranefly

MALWARE FAMILIES: ReGeorg, trojan.geppei, trojan.danfuan

ATT&CK IDS: T1102 - Web Service, T1562 - Impair Defenses, T1059 - Command and Scripting Interpreter, T1014 - Rootkit, T1140 - Deobfuscate/Decode Files or Information, T1564 - Hide Artifacts, T1204 - User Execution

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https://otx.alienvault.com/pulse/638ed3d9f415f438eb189931