문서파일 취약점을 활용한 파일리스(Fileless) 악성코드의 스텔스 위협
2018-01-04 • ESTSecurity • Stealth threat from fileless malware exploiting document file vulnerabilities •
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 |