RTF / .DOC malware analysis — malicious · 9ab75f3c60adc586

MALICIOUS

RTF / .DOC

698.4 KB First seen: 2023-02-01

MD5: 342550e9ccd167df75606545a53e9b0a SHA-1: 30f28411b298aeda401364af8f27f164d634a567 SHA-256: 9ab75f3c60adc58693a916cac8ec6dbe53f32d5355ab5db8587693c0426be40b

182 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains an OLE object specifically crafted to exploit the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to decode and execute a secondary Portable Executable (PE) payload embedded within the object data. The presence of the ".bin" artifact and the critical heuristics strongly indicate this malicious behavior.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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_off00000079.bin` `c6c43aa0b107c79d22f7226171c137ce68ac2024d14413c945bb8d315efea319`	rtf-objdata-decoded	RTF \objdata at offset 0x79	357493 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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