RoKRAT 셸코드 및 스테가노그래피 기반 위협 분석과 EDR 대응 방안

2025-08-03 Genians RoKRAT shellcode and steganography-based threat analysis and EDR response strategies

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

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Genians analyzes an APT37 RoKRAT campaign in Korea that used oversized LNK files, malicious HWP/OLE content, DLL side-loading, and JPEG steganography to load payloads. One infection chain hides a decoy HWP document, batch script, PowerShell command, and shellcode inside a shortcut, then uses staged XOR decoding to produce a 32-bit RoKRAT executable and inject it into mspaint.exe or notepad.exe. The final RoKRAT module collects host information, documents, and screenshots, then attempts exfiltration through legitimate cloud services including Yandex and Dropbox using cloud API requests and access tokens. The report also documents RoKRAT hidden inside JPEG resources and reinforces the need to monitor external cloud API traffic, script execution, and fileless loader behavior.

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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