RTF / .DOC malware analysis — malicious · a41cc07311efb249

MALICIOUS

RTF / .DOC

1.20 MB

MD5: 3806b0685cb0ab1fbc9b24d86ba5bc06 SHA-1: 3296044518081f77b7a8c88d4e15498d26ecd494 SHA-256: a41cc07311efb249311453af4c1c6426de7867f443d338e5f6ce1c3bbc01aeb0

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an RTF document containing OLE object data, specifically a decoded Equation Editor payload. Heuristics indicate that \objdata and \objupdate force OLE activation, and the excessive hex data likely hides a PE payload. This suggests the file is designed to exploit the Equation Editor vulnerability to download and execute a second-stage payload, as evidenced by the extracted artifact.

Heuristics 5

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1252KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000cb2.bin` `982c1ff938b07e60884f005bb5e092a0c97e8b663e0edc91f8e87f8d7ea2a512`	rtf-objdata-decoded	RTF \objdata at offset 0xCB2	626359 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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