RTF / .DOC malware analysis — malicious · 9fcb464892635ab8

MALICIOUS

RTF / .DOC

311.1 KB

MD5: a6c126a7ae69e9444c9a22f834c3d728 SHA-1: 7ee4aaed7beb0e1f19849468607734d0c2c50ac5 SHA-256: 9fcb464892635ab8d0a47ae0da2d4249771ddf7aa1e559aa5c9011fbf383440c

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The sample is an RTF document that contains embedded OLE object data, specifically a decoded Equation Editor payload. The presence of \objupdate indicates that the document is designed to trigger the OLE object activation, which in turn exploits a vulnerability in the Equation Editor. This exploit likely leads to the download and execution of a secondary payload, as suggested by the critical RTF_EQUATION_EDITOR heuristic. The extracted artifact 'objdata_00_off000011f8.bin' is the decoded 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_off000011f8.bin` `375dc96341b15d3f85ab4cbfc27a757f2a41d89f75bf6f8663d3059922bc11f5`	rtf-objdata-decoded	RTF \objdata at offset 0x11F8	156695 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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