RTF / .DOC malware analysis — malicious · 432b290049eacfb7

MALICIOUS

RTF / .DOC

311.3 KB

MD5: f66296096a22606da5c21d723273b095 SHA-1: c52b92f5c7cbf30c254950846fcea4d6463bf6ac SHA-256: 432b290049eacfb77d5f3db0af1b6a20da1af49f37db0fe471b1827db6e205cc

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, specifically decoded Equation Editor payload. The RTF_OBJUPDATE heuristic indicates that the object is designed to be activated automatically, likely leading to the execution of the embedded PE file. This strongly suggests an exploit targeting the Equation Editor vulnerability to download and run a secondary payload.

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_off0000174d.bin` `879095724f3e8611f2d0ae6bc75a16366ff6adf7f35500692293ab8300d0c2e4`	rtf-objdata-decoded	RTF \objdata at offset 0x174D	156352 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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