RTF / .DOC malware analysis — malicious · ab549899bea83ba5

MALICIOUS

RTF / .DOC

458.6 KB

MD5: 88fb2c962d8027721132b6707ca2f05a SHA-1: 008e00ce5aae149243c86892903e92c9e0a0eee2 SHA-256: ab549899bea83ba5debeecd34c7172a244dc5e270826d2583548621a238115c6

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that decodes to a PE file, indicating a likely exploit targeting the Equation Editor. The critical RTF_EQUATION_EDITOR heuristic confirms this, suggesting the file is designed to execute arbitrary code upon opening. The presence of OLE object data and the objupdate heuristic further support the exploitation of embedded objects. No document body text or scripts were extracted, but the critical heuristic strongly points to a malicious exploit delivery mechanism.

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_off00000ab1.bin` `206cecf1115515331809568f0a7ca9f0cd689c29fa64e50b11b5518936317627`	rtf-objdata-decoded	RTF \objdata at offset 0xAB1	233371 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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