Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 60d98e96430282fd…

MALICIOUS

RTF / .DOC

383.7 KB
MD5: 92e5ef99993375b8abe210d493f2b36f SHA-1: fed37b17e5aab3578461b7ddf29cdec40ad99f73 SHA-256: 60d98e96430282fddef67a19528b3296b4f836f2fff7b64c9c5fa6bdd0a3109c
200 Risk Score

Malware Insights

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

The RTF document contains OLE object data and triggers ".objupdate" which indicates an attempt to activate embedded objects. Specifically, the presence of a Composite Moniker and the CVE-2017-8570 heuristic strongly suggest the file is designed to drop and execute a script, likely a SCT file, leveraging this known vulnerability for client execution. No document body text was available for further analysis.

Heuristics 6

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • \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 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact medium 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000007d1.bin
4c1e31e1bb15a1df221b7bb72979c438ff1fe885d512b10ebd5da94e9f8e34ee		 rtf-objdata-decoded RTF \objdata at offset 0x7D1 97527 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
objdata_01_off000320d6.bin
ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331		 rtf-objdata-decoded RTF \objdata at offset 0x320D6 2632 bytes
objdata_02_off00033679.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x33679 12297 bytes

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