Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 90ebc40238645156…

MALICIOUS

RTF / .DOC

314.8 KB
MD5: 3a07d9d474889feb6a209c870ae89fb2 SHA-1: f64cb6a2fa510ab43916e16bb752ee0b4e68009a SHA-256: 90ebc40238645156eb122767a384460e50317435859a2758630bc1df295f9fcb
129 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The RTF document contains OLE object data and an \objupdate directive, indicating it's designed to exploit RTF parsing vulnerabilities. The embedded OLE object, objdata_00_off00000776.bin, is a suspicious artifact. This suggests the document's primary purpose is to trick the user into activating the embedded object, which likely leads to the download and execution of a secondary payload.

Heuristics 3

  • \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.

FilenameKindSourceSize
objdata_00_off00000776.bin
78d9017087769d9b99e109abdf738fa867a0aba4cd57b959f53b00b4a7cbe1ed
rtf-objdata-decoded RTF \objdata at offset 0x776 64051 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.