Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 639aedb92d3fa814…

MALICIOUS

RTF / .DOC

162.8 KB
MD5: f192f19623b557b91493587c8eadb256 SHA-1: 83baf761c13fde834d4ed7da4d2ede734aa645a9 SHA-256: 639aedb92d3fa814549e7719e0e2cf67c4c3ee0fd9fd92619def557b159f9ca0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object with a high entropy stream, indicated by the RTF_OLE10NATIVE_STREAM heuristic. The RTF_OBJUPDATE heuristic suggests that this object is designed to be activated, likely to execute a secondary payload. The extracted artifact 'objdata_00_off000018ae.bin' is suspicious due to its high entropy and is likely the embedded malicious content.

Heuristics 4

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • \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_off000018ae.bin
21c9eda98f03c86029b3d6dda225c08fc4dee86f9b73206799de244d33adbe05
rtf-objdata-decoded RTF \objdata at offset 0x18AE 64063 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.92, consistent with packed or encrypted content.