문서파일 취약점을 활용한 파일리스(Fileless) 악성코드의 스텔스 위협

2018-01-04 ESTSecurity Stealth threat from fileless malware exploiting document file vulnerabilities

http://blog.alyac.co.kr/1469

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ESRC analyzed a malicious HWP document disguised as analysis of North Korea’s 2018 New Year address and assessed it as part of an ongoing spear-phishing pattern against Korean targets. The document embeds an Encapsulated PostScript component that runs shellcode, decrypts a C2 reference, and loads a PNG file from 60chicken.co.kr containing additional hidden shellcode. The payload operates in memory as fileless malware, includes anti-VM behavior, and can receive additional commands from overseas cloud services. ESRC connected the attack code to earlier HWP exploit campaigns using political and security-themed lures, including activity observed against Korean institutions, election-related entities, and North Korea-focused organizations.

Indicators of Compromise

Type Value First Seen Last Seen
DOMAIN 60chicken.co.kr 2018-01-04 2018-01-16

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