Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b7c30942928b37d6…

MALICIOUS

RTF / .DOC

236.4 KB First seen: 2023-08-02
MD5: d48d1e3db15e83cc40de753fbe864352 SHA-1: 97fe2d0694bd16da638602d7197555431c8fed01 SHA-256: b7c30942928b37d659e6cc65e0bb039ec3a47cde253eb234b0c4424da3ded520
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-8570 vulnerability. This vulnerability is known to be used to drop and execute script files, likely for further malicious activity. The presence of multiple OLE object data sections and the activation via \objupdate strongly indicate an exploit attempt.

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.

FilenameKindSourceSize
objdata_00_off000007bc.bin
00756a999161c49e5bc68c1bf8b8d0f59311abe71f7519518844f683e340fb89		 rtf-objdata-decoded RTF \objdata at offset 0x7BC 25000 bytes
objdata_01_off0000d37a.bin
2f4e481fc703308b3ea4be7a52293e9bb733c26dcf8c28b432fb99357e0cfb38		 rtf-objdata-decoded RTF \objdata at offset 0xD37A 2632 bytes
objdata_02_off0000e91d.bin
142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78		 rtf-objdata-decoded RTF \objdata at offset 0xE91D 12297 bytes

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