RTF / .DOC malware analysis — malicious · c2a91909b7087801

MALICIOUS

RTF / .DOC

617.4 KB

MD5: 17831552ad3a2872f6e92c2fab03f914 SHA-1: a8746baaf0990a43f936882a1ebe73773c43af18 SHA-256: c2a91909b7087801b1ae7689e24623160221a7b165f5beb87ba03afa627524b9

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains an embedded OLE object that decodes to a PE file, specifically targeting the Equation Editor vulnerability. This indicates a likely exploit delivery mechanism. The decoded artifact is a PE file, suggesting it's designed to execute a secondary payload. The presence of the ".DOC" file type and the Equation Editor exploit strongly points to a malicious document designed for initial compromise.

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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00000052.bin` `98edd2b566561e70ae8e86d4dfd34e058ae685a2c8aad963e54c3bbe68215683`	rtf-objdata-decoded	RTF \objdata at offset 0x52	315981 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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