RTF / .DOC malware analysis — malicious · 41640874f967f547

MALICIOUS

RTF / .DOC

300.0 KB

MD5: 2edfb68df09bacb4645a3d2e06d171af SHA-1: b44c27c6c94e9387fa24c5621c0b7f0be4da8fae SHA-256: 41640874f967f5475100ade7ef9bc95027c95856f6829d465abbdd69c53b41ce

122 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 RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. This exploit is designed to download and execute a secondary payload, indicated by the 'RTF_EQUATION_EDITOR' and 'RTF_OBJDATA' heuristic firings. The presence of an extracted PE file further supports the malicious intent. The specific payload and delivery mechanism are not fully discernible from the provided data, leading to an 'unknown family' classification.

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_off00000042.bin` `8dece3855563ab81d4f88f0a123079f29132c2c2a00b2d68d332eab9d6299190`	rtf-objdata-decoded	RTF \objdata at offset 0x42	153429 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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