RTF malware analysis — malicious · 5dc1511c523b9f44

MALICIOUS

RTF

477.3 KB First seen: 2023-02-06

MD5: c4d46abe171ce13b33ac78deb2ffa795 SHA-1: a58bb2cf552a08c3603e42ab5d245359f5ab2dfd SHA-256: 5dc1511c523b9f44580ede70726f3d2acb439de04feeb5bddd1b037005dc5d50

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF file contains OLE object data and triggers ".objupdate" which are indicative of exploitation. Specifically, the "CVE_2017_8570" heuristic firing points to the use of a Composite Moniker to drop an SCT script, a known technique for executing malicious code. The embedded document body appears to be a fake invoice, suggesting a social engineering lure to trick users into opening the malicious RTF file.

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_off000378b4.bin` `4dcc25acc13956d519deebccf70676fb95d28df1813720363cb16996977cea9b`	rtf-objdata-decoded	RTF \objdata at offset 0x378B4	35148 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000496e6.bin` `24fedef2d4fe5e3d6666fae2543850c54134511ad6be8583d5aa0438ef699c5d`	rtf-objdata-decoded	RTF \objdata at offset 0x496E6	2632 bytes
`objdata_02_off0004ac89.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x4AC89	12297 bytes

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