RoKRAT Shellcode and Steganographic Threats: Analysis and EDR Response Strategies

2025-08-03 Genians

https://www.genians.co.kr/en/blog/threat_intelligence/rokrat_shellcode_steganographic

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Genians identifies a new RoKRAT variant used by APT37 and delivered in South Korea through a compressed archive containing an unusually large malicious LNK file. The shortcut masquerades as a national intelligence and counterintelligence manuscript and embeds a decoy HWP document, shellcode, PowerShell commands, and a batch script. The execution flow runs batch and PowerShell stages that decode shellcode with XOR operations, produce a 32-bit executable, and inject payloads into hardcoded Windows processes such as mspaint.exe, with a later variant switching to notepad.exe. The embedded PDB path containing InjectShellcode, and later a Weapon directory, gives defenders useful variant-tracking evidence while showing continued fileless and shortcut-based tradecraft tied to APT37.

Indicators of Compromise

Type Value First Seen Last Seen
EMAIL [email protected] 2025-08-03 2026-04-12
HASH ccb6ca4cb385db50dad2e3b7c68a90d… 2025-08-03 2026-01-14
HASH 90bf1f20f962d04f8ae3f936d0f9046… 2025-06-09 2025-08-29
DOMAIN cloud-api.yandex.net 2018-02-27 2025-08-29
HASH 41d9b6d8cf0fff85bf35327d4b94db6… 2025-08-03 2025-08-03
HASH 9eca7ab62e3ad40b79116ad713462e3… 2025-08-03 2025-08-03
HASH ca56720610400d6da773ffa4cce5b24… 2025-08-03 2025-08-03
HASH 7d514021c472e6e17f587ed30555d3f… 2025-08-03 2025-08-03
HASH bf7d5020dcd7777509b7b542255814c… 2025-08-03 2025-08-03
HASH 7ee4326c5d0e6a30c1a9bdec045d670… 2025-08-03 2025-08-03
HASH e27467f7fdfa721e917384542ce10cc… 2025-08-03 2025-08-03
HASH 6a2d984ef3fa0de9b9feb5f55838120… 2025-08-03 2025-08-03
HASH 3fa06c290c477c133ca58512c7852fc… 2025-08-03 2025-08-03
EMAIL [email protected] 2025-08-03 2025-08-03
EMAIL [email protected] 2025-08-03 2025-08-03
EMAIL [email protected] 2025-08-03 2025-08-03

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