RTF / .DOC malware analysis — malicious · 9fabe6f9fe292e7c

MALICIOUS

RTF / .DOC

471.9 KB

MD5: fc108bd18e133b74c9dc1a1f8ac787c3 SHA-1: b67ee9349c77a008797fbbef0d67f2797f7adef1 SHA-256: 9fabe6f9fe292e7c12167edf88c83d7bfed857921b31c42229b33ebd9cd12be3

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be exploited to execute arbitrary code. The presence of the `RTF_EQUATION_EDITOR` and `CLAMAV_DETECTION` heuristics strongly indicates this exploit. The `RTF_OBJUPDATE` heuristic suggests that the embedded object is designed to be activated automatically. While no specific second-stage payload or network indicators were extracted, the exploit itself is the primary attack vector.

Heuristics 5

Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001e5f.bin` `b55d49a228ed2e0ebe0b826e7aa0783fb8570e0300f94fbd36b763d6f17e6bff`	rtf-objdata-decoded	RTF \objdata at offset 0x1E5F	237607 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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