RTF / .DOC malware analysis — malicious · d994f6056feaeaa9

MALICIOUS

RTF / .DOC

300.6 KB

MD5: a16fcf40928723827ab9b7d9de5ad0cc SHA-1: 2cf05041a901ecc437f3475d67046dbc19a07398 SHA-256: d994f6056feaeaa9417b384ebfa6fad79af8cac013e6f044a23d64b52a5021f9

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object with automatically linked data, specifically targeting the Equation Editor. This indicates an attempt to exploit a known vulnerability within the Equation Editor component to execute arbitrary code. The decoded object is a PE file, confirming the delivery 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.
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.
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_off0000004e.bin` `c5f3f7c7f542104cacc0f3afa3b1f61eef75b936c9b1cdd3561b0b44586a1b39`	rtf-objdata-decoded	RTF \objdata at offset 0x4E	153788 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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