RTF malware analysis — malicious · 0fda2ed89ed1c6b3

MALICIOUS

RTF

336.0 KB First seen: 2022-09-19

MD5: c6895e2fa8507e8fa78648f7d5e5e55b SHA-1: 333ad9fc7bfda9df045bcc19b86f60be2c2525cd SHA-256: 0fda2ed89ed1c6b32baab3e7738eed48fcee4699a7d39eb880b791d62177887f

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The RTF file contains embedded OLE objects, with critical heuristics indicating the exploitation of CVE-2017-8570. This vulnerability is known to be used to drop and execute script files, likely for further payload delivery. The presence of multiple objdata sections and specific CLSID further supports this attack vector.

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` `0d976d4ba7390a17ea9a5b11ec381a1bd8bff5af54cb1dacaf4868ba578a06d0`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	74029 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000261ee.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0x261EE	2632 bytes
`objdata_02_off00027791.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x27791	12297 bytes

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