RTF / .DOC malware analysis — malicious · c18bc6e272cd38c8

MALICIOUS

RTF / .DOC

216.1 KB First seen: 2022-09-27

MD5: 4e30d8835ea27787c2f51e0f5d1e4c66 SHA-1: c29a1a5121d39c50bde3b3fd3dbd9895d5435198 SHA-256: c18bc6e272cd38c813e31957f86aead59ce378171c3ec0b4df1de502b0602482

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.003 Windows Command Shell

The RTF document contains embedded OLE objects with composite monikers, strongly indicating the exploitation of CVE-2017-8570. This vulnerability allows the embedded object to execute arbitrary code, typically by dropping and running a script. The extracted artifact 'objdata_00_off000007d5.bin' is flagged as a suspicious extracted artifact related to script execution, further supporting this attack vector. The primary goal appears to be the execution of a secondary payload.

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_off000007d5.bin` `59ecb388d7f804cd48111693e5d48d02e01e701ac3bdc05b489de5035b8ac540`	rtf-objdata-decoded	RTF \objdata at offset 0x7D5	14959 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000081fd.bin` `504a1216f00cdb016e51ea14d7ff68ead047e5a4c24c8ad7ca429d9d93fd8ad7`	rtf-objdata-decoded	RTF \objdata at offset 0x81FD	2632 bytes
`objdata_02_off000097a0.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x97A0	12297 bytes

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