RTF / .DOC malware analysis — malicious · ad9ebcad7f46a153

MALICIOUS

RTF / .DOC

1.60 MB

MD5: 4562052eaa9f3f54829464db8ec4f69d SHA-1: 4cbe87f6776bd806ab1d78f448235b66d118decc SHA-256: ad9ebcad7f46a153dec5c0781f00f0dd14aa112ae1ba33b671df19c528705621

162 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains a decoded Equation Editor payload, indicating it exploits a vulnerability in that component. The presence of OLE object data and excessive hex data suggests the embedding of a malicious executable. The primary attack vector is likely a spearphishing attachment, leading to the execution of a secondary payload.

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 ~1670KB 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_off00000f94.bin` `953fbf1dd44152d2a6d8c2ed7b572cfdda0acc74d095003d603d4bc70753c997`	rtf-objdata-decoded	RTF \objdata at offset 0xF94	835110 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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