RTF / .DOC malware analysis — malicious · e9e59ba8a68721d1

MALICIOUS

RTF / .DOC

313.1 KB

MD5: 636149a9946f4d2651f19bc9bd8498b0 SHA-1: a86d2e8a6eec73a8faabd5b9d43c5c79a2b94bfe SHA-256: e9e59ba8a68721d14fb108f92c493acf49bb63a989d8926431a876f69d06322b

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 containing an embedded OLE object that leverages the Equation Editor vulnerability. The RTF_EQUATION_EDITOR heuristic confirms a decoded Equation Editor payload, and RTF_OBJUPDATE indicates that the object is designed to be activated. This suggests the document's primary purpose is to exploit this vulnerability to download and execute a secondary payload, likely a PE file, as indicated by the heuristic 'Decoded Equation Editor payload + PE'.

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_off000019e7.bin` `0b8193edc870cf284cdc9558c54f8cbbd99a81ed6bf202105bf215f349c205b6`	rtf-objdata-decoded	RTF \objdata at offset 0x19E7	156738 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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