RTF malware analysis — malicious · 3c5676b6bb2f4e35

MALICIOUS

RTF

232.7 KB First seen: 2023-07-19

MD5: 2891b742d6d04d77ed07e50d9b75f57d SHA-1: 5a924c39b41acba05658f957554acfb8268a368e SHA-256: 3c5676b6bb2f4e3540dea95eeb51a3f3e208f18e851b71b03ce7cb942408fde8

180 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF file contains embedded OLE objects and triggers an ".objupdate" directive, indicating an attempt to activate embedded content. Heuristics specifically identify the use of a Composite Moniker related to CVE-2017-8570, which is known to drop SCT scripts. This suggests the file is designed to exploit this vulnerability to execute a script, likely leading to a second-stage payload.

Heuristics 5

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007bc.bin` `c07a9e543e612ccd7d578f799ead56697eed42a17be001c4c29bc427f27c216b`	rtf-objdata-decoded	RTF \objdata at offset 0x7BC	23153 bytes
`objdata_01_off0000c478.bin` `2f4e481fc703308b3ea4be7a52293e9bb733c26dcf8c28b432fb99357e0cfb38`	rtf-objdata-decoded	RTF \objdata at offset 0xC478	2632 bytes
`objdata_02_off0000da1b.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDA1B	12297 bytes

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