RTF / .DOC malware analysis — malicious · 2b85c5f6980513d4

MALICIOUS

RTF / .DOC

336.0 KB First seen: 2022-09-20

MD5: 689ad4613a369f1331b043301e8abe9d SHA-1: e8ab3810148ac55c2ca039ca4d4efa3246515780 SHA-256: 2b85c5f6980513d4a10c3ab48aee6e1e14498313b8fa8fea81484b843150707b

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious File T1059 Command and Scripting Interpreter

The RTF document contains OLE object data and triggers CVE-2017-8570, which is known to drop and execute SCT scripts. The composite moniker identified in the OLE object data is a strong indicator of this exploit. The embedded OLE objects and the objupdate directive further support the exploitation of this vulnerability.

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` `52f84583c59648cdd9f114fe3cc763b9b20ba6962921516e16a81ccb0cf569b4`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	74045 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00026210.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0x26210	2632 bytes
`objdata_02_off000277b3.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x277B3	12297 bytes

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