RTF / .DOC malware analysis — malicious · 103981eaa5271b75

MALICIOUS

RTF / .DOC

318.4 KB

MD5: ac0bedbf6f5271f918acb739039c2011 SHA-1: 33e969681d9232635862f522ca1aa82ed34f8e34 SHA-256: 103981eaa5271b753614a057277af6723814660cfe3150ca994e041718f96ff7

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE object data, specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to allow for arbitrary code execution, typically used to download and run a secondary malicious payload. The presence of the Equation Editor CLSID and the ".objupdate" directive strongly indicate this exploit is active.

Heuristics 6

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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_off00001042.bin` `427d0fee885c768e908a7be6fda53aae44eeff7835cd03951788bfea19c66d59`	rtf-objdata-decoded	RTF \objdata at offset 0x1042	160831 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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