RTF / .DOC malware analysis — malicious · cbb4d31e21dff89e

MALICIOUS

RTF / .DOC

310.2 KB

MD5: e838d46ca0f8111081dd11a13ec2a85a SHA-1: 910112f91e10eae721ca91bc1e12a5cf65535bae SHA-256: cbb4d31e21dff89ed5a2acc3096205006fcc2f812fefaa5695c1893f25f1896f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive indicates that the embedded object will be activated automatically upon opening. This suggests the file is designed to exploit this vulnerability to execute arbitrary code, likely leading to the download and execution of a second-stage payload. The high risk score and critical heuristic firing strongly support this conclusion.

Heuristics 5

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
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_off00001096.bin` `0d9c439470a83c60a559254c90e4c66cbbd687939b1bd8b43a933ff2dbc55e77`	rtf-objdata-decoded	RTF \objdata at offset 0x1096	156624 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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