RTF / .DOC malware analysis — malicious · d594d9b1a7b9dcc3

MALICIOUS

RTF / .DOC

1.21 MB

MD5: 4d6f561c9c84b98757d4a111bedbec25 SHA-1: 4e09a50736977ee3de1150ecd0b14a3d18dbe2a7 SHA-256: d594d9b1a7b9dcc3efe8566c5533e10cb0fa341e28e0f791d6eb073cd3f166c9

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that is automatically linked and updated, triggering activation. Critical heuristics indicate that this object decodes to a PE file, strongly suggesting exploitation of the Equation Editor vulnerability (CVE-2017-11882). The large amount of hex-encoded data within the OLE object likely hides the malicious payload. No document body text or scripts were extracted, but the heuristics clearly point to a delivery mechanism leveraging a known Equation Editor exploit.

Heuristics 6

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 ~1257KB 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_off00001c6b.bin` `27280f73947bbee2f7eef4f11f1067b6ffbb1f5b28fc045d55b35ebaaf7b5169`	rtf-objdata-decoded	RTF \objdata at offset 0x1C6B	628551 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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