RTF / .DOC malware analysis — malicious · 4caadd38135ab5b1

MALICIOUS

RTF / .DOC

301.4 KB

MD5: 60cd8639fa751aae2797b383518e4014 SHA-1: 521f95888c534e2b6492398840bb9b0b0d135def SHA-256: 4caadd38135ab5b1995f116ddb24e6080cf710882640f444465dc0fc09c2cbf3

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. This vulnerability is known to be used for arbitrary code execution, typically to download and run a second-stage payload. The heuristic 'RTF_EQUATION_EDITOR' directly indicates this exploit vector. The extracted artifact 'objdata_00_off00000043.bin' is the decoded payload from the Equation Editor, which is likely the initial stage of the attack.

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_off00000043.bin` `cdfc49d7fd9909f75fdff7ed5b11fb849235813c84d9a33f2e34b41ce9d2d445`	rtf-objdata-decoded	RTF \objdata at offset 0x43	154198 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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