RTF / .DOC malware analysis — malicious · 796f5c2148689cfa

MALICIOUS

RTF / .DOC

313.0 KB

MD5: 53a8a9ef5bbf4be0a2e8c511d96b3843 SHA-1: de5ba0b8a1fa58fcfcbc895276bdd1ce32be8ba3 SHA-256: 796f5c2148689cfa0053e42f574d927db4f33dc959ae5d74e827fdd4988e1dac

162 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

The RTF document contains an embedded OLE object that is automatically linked and updated, triggering activation. Static analysis decodes this object, revealing a PE file originating from the Equation Editor. This indicates an exploitation attempt to execute arbitrary code, likely to download a second-stage payload. The high confidence is due to the clear exploitation chain identified via heuristics.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00001caa.bin` `09978f6474c5183a94d0fb5bc8251f83ecccfcc72078500deb1fb4c3411b6ce5`	rtf-objdata-decoded	RTF \objdata at offset 0x1CAA	156476 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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