RTF / .DOC malware analysis — malicious · 8f41863057e1e153

MALICIOUS

RTF / .DOC

302.5 KB

MD5: 0c8cf53bfac4bfdd97aa3b44885e695b SHA-1: 32a2d759506a1a992202a8ae35f1467e33a29928 SHA-256: 8f41863057e1e153f0cd2a05c7c508d55dbe6e1e8e0c78b5aea2356a30996c7a

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that decodes to a PE file, leveraging the Equation Editor vulnerability. The ".objupdate" heuristic indicates that the OLE object is designed to be activated automatically, likely to execute the embedded payload. The extracted artifact "objdata_00_off00000044.bin" is also flagged as suspicious. The primary attack vector appears to be exploiting the Equation Editor vulnerability to drop and execute a secondary payload.

Heuristics 4

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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_off00000044.bin` `fec6ebd8e9c657926918b824ae9270f09df084df03b486ac764cda8e8aa6f7b5`	rtf-objdata-decoded	RTF \objdata at offset 0x44	154810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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