RTF / .DOC malware analysis — malicious · cd963c7fd68b64c5

MALICIOUS

RTF / .DOC

312.1 KB

MD5: fe1fa3cdb148308b058214cd16c1ab1b SHA-1: 9e91b75553fb43947fab0646e1a96d8884deeb4f SHA-256: cd963c7fd68b64c5ad6ebffe6f720257fc368b5aac5295db7f1a2644eec5c3be

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object that decodes to a PE file, indicating a malicious payload. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly suggests exploitation of the Equation Editor vulnerability to trigger the embedded object. This is a common delivery mechanism for downloading and executing second-stage malware.

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_off000014cb.bin` `1d0e9ac93a6df30087db07184542d39dbec43b3b09d971011f38d16ac2f3cda4`	rtf-objdata-decoded	RTF \objdata at offset 0x14CB	156741 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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