RTF / .DOC malware analysis — malicious · ed061760cfb9c9b1

MALICIOUS

RTF / .DOC

313.1 KB

MD5: ceef832537bd67ca740458be92f9e107 SHA-1: d399ff8f58ff66966b9544935801a10b79aa96a0 SHA-256: ed061760cfb9c9b10a73168e67f689cfc576908e6ac6816363498107c29b10e9

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. The critical RTF_EQUATION_EDITOR heuristic confirms the presence of a decoded Equation Editor payload which is a PE file. This indicates the document is designed to exploit this known vulnerability for initial access, likely leading to further stages of malware execution.

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_off00001ccc.bin` `6847b7b14ce6c817bcd9edda81d4cbacbba4dcf8fdcecabde700ca9980d1db89`	rtf-objdata-decoded	RTF \objdata at offset 0x1CCC	156530 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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