RTF / .DOC malware analysis — malicious · 40efd9c35f6f0ffb

MALICIOUS

RTF / .DOC

460.0 KB

MD5: fb871deb61ad117b1b0e425a89149e11 SHA-1: 307407f41936a162cf33c8ae47adb257a481c8cc SHA-256: 40efd9c35f6f0ffbefb57775b3c2cf2b336d10c9401b4294b7f93572aad280e3

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with a suspicious Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive further suggests that the embedded object is designed to be activated automatically. The extracted objdata artifact is likely the malicious payload. No document body text or scripts were available for further analysis, but the heuristics strongly suggest a classic exploit delivery mechanism.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off00001158.bin` `3508674946099d5ae495024100d8f5c211eb31d60793be85713edbdfe056825d`	rtf-objdata-decoded	RTF \objdata at offset 0x1158	233236 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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