RTF / .DOC malware analysis — malicious · d18e1170fbfb761e

MALICIOUS

RTF / .DOC

257.1 KB First seen: 2023-01-27

MD5: a8ec8ca52d93a70d932557d1c086af71 SHA-1: f5fc86e48773658fe9a091ee6a275e70f2cbd903 SHA-256: d18e1170fbfb761e9e824519d4b7bebb5cb0eb3cc24d49343d41bded65db88f3

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1559.002 Component Object Model Hijacking

The RTF file contains OLE objects with composite monikers, strongly indicating exploitation of CVE-2017-8570. This vulnerability allows for the dropping and execution of a script, likely a second-stage payload. The embedded OLE object data and related heuristics confirm the exploitation attempt.

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.

Filename	Kind	Source	Size
`objdata_00_off000007d4.bin` `34b0d616e18ca567484224e96c609069ea82dd706483074c678c6ae47814325c`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	35184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00012650.bin` `24fedef2d4fe5e3d6666fae2543850c54134511ad6be8583d5aa0438ef699c5d`	rtf-objdata-decoded	RTF \objdata at offset 0x12650	2632 bytes
`objdata_02_off00013bf3.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x13BF3	12297 bytes

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