RTF / .DOC malware analysis — malicious · e2e87778c403b28b

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 532f7240f3a6142220e7270c8ce094de SHA-1: f4342fa5b1da0c304818150deafa46fea892a35e SHA-256: e2e87778c403b28b9eac4ca7a6f6376805e3d26d15ce7f41fed105ee9dc462ab

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an RTF document containing an embedded OLE object that decodes to a PE file, indicative of a weaponized document. The RTF_EQUATION_EDITOR heuristic confirms the use of the Equation Editor vulnerability, a common delivery mechanism for malware. The extracted artifact 'objdata_00_off00000946.bin' is the decoded payload, likely responsible for further malicious actions such as downloading additional stages.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1934KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000946.bin` `63acce3b6ab60f40fb2dbbb4c68475e577a7534caebe5e2fe59e60247765ba3f`	rtf-objdata-decoded	RTF \objdata at offset 0x946	967217 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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