RTF / .DOC malware analysis — malicious · d20a0e3379ab7c23

MALICIOUS

RTF / .DOC

311.8 KB

MD5: fba5e22115c2eae98d9c28b3b40d9c23 SHA-1: dda12a4cd2ed15ee8de2846ffb6bb067a525aaf8 SHA-256: d20a0e3379ab7c233f4d324950ee996df3bd2685eb625af245e651fe0b3aba4e

122 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 that contains an embedded OLE object. Heuristics indicate that this object is a decoded Equation Editor payload which is designed to be activated via \objupdate. This mechanism is commonly used to download and execute a second-stage payload, likely a PE file, from a remote source. The presence of the \objdata section and the critical RTF_EQUATION_EDITOR firing strongly suggest exploitation of a known vulnerability.

Heuristics 4

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
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_off00001770.bin` `e16f9137332d1f9f88119db99bee3b26a96b891fccfe74057202b6a0aabe7541`	rtf-objdata-decoded	RTF \objdata at offset 0x1770	156543 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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