RTF / .DOC malware analysis — malicious · f8b9d8abdab8eb76

MALICIOUS

RTF / .DOC

235.2 KB

MD5: 73eeb67456abcd0d9ee465dd4d4d2791 SHA-1: 4cce8ecfed478e27aa1e82306ba344e5b8bfadd1 SHA-256: f8b9d8abdab8eb76a376013e55887bfcda18664d7e73ca42e97ffda183d128f1

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The file is an RTF document containing an embedded OLE object that leverages a known vulnerability in the Equation Editor. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates an exploit targeting this component. The `RTF_OBJDATA` heuristic further confirms the embedding of OLE object data, which is likely the payload delivery mechanism. The document body contains only a numerical string, providing no contextual lure, but the technical indicators point to a classic exploit delivery.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off0000004e.bin` `36e25639f0d789dbed5ad4d66a09b1d608edb5de5c6b202c179ed53dd9c6fb9c`	rtf-objdata-decoded	RTF \objdata at offset 0x4E	120320 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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