RTF / .DOC malware analysis — malicious · 8e3a7a9951c7f498

MALICIOUS

RTF / .DOC

3.73 MB

MD5: ab8abf6945a003b4b61d85137e1c9321 SHA-1: f6da43c0fa20e9c923a5c6b34795b4cc5e9ef06f SHA-256: 8e3a7a9951c7f498f63af07570a0514139725e85be5a7b11f2d1e9c69f8c97a6

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains embedded OLE object data, specifically a decoded Equation Editor payload. The presence of ".objdata" and ".objupdate" heuristics, along with excessive hex data, strongly indicates the exploitation of the Equation Editor vulnerability (CVE-2017-11882) to execute a secondary payload. No specific family could be identified, but the delivery mechanism is clearly an exploit embedded within a document.

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 ~3910KB 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_off00000044.bin` `703ccdc97a7825fc4bb221c780c62e3ac88c8ca66a5942d5d6aab37b3f9ea129`	rtf-objdata-decoded	RTF \objdata at offset 0x44	1955279 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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