RTF / .DOC malware analysis — malicious · 3f8a93664ff00793

MALICIOUS

RTF / .DOC

309.4 KB

MD5: 3f000eac9c4a8040bf15606b6993ba29 SHA-1: cc3f348c9a3de883aa5b7a4f5c632a20db77111a SHA-256: 3f8a93664ff00793c9a281ab5a836ab6e699f379b096675af863fd9c22afcfb1

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically a decoded Equation Editor payload. Heuristics indicate that \objupdate forces OLE activation, which is a common technique for exploiting vulnerabilities like CVE-2017-11882. The decoded object is a PE file, suggesting it's a downloader or initial stage of a malicious payload. The presence of the Equation Editor exploit points to a delivery mechanism designed to trick the user into opening the document and triggering the exploit, leading to the execution of a secondary payload.

Heuristics 4

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
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_off0000094c.bin` `d186a7079c0fb6f6133fbbb343cd2f5fb0e7dd8a5c83a988da3cc56264789c15`	rtf-objdata-decoded	RTF \objdata at offset 0x94C	156895 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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