Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 71c56b9fa609c6d6…

MALICIOUS

RTF / .DOC

223.7 KB First seen: 2022-08-02
MD5: b11d518a9357ecac0f2e416178c31ed6 SHA-1: cf092888067b7fd465aacbcd42fda8988e679ee2 SHA-256: 71c56b9fa609c6d68f9ce52130003f1ae7117da9218589736dc32fa0c79a3d6e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File

The RTF document contains embedded OLE objects with composite monikers, specifically triggering the CVE-2017-8570 vulnerability. This vulnerability is known to drop and execute SCT scripts, indicating a likely multi-stage attack where this RTF file serves as the initial dropper. The embedded objects and heuristics strongly suggest an exploit designed for arbitrary script execution.

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_off000007d2.bin
e135a30719d1feeaec20f6973d9b3908dc90dd7bf5ba547fa20bfcd7ea4fb114		 rtf-objdata-decoded RTF \objdata at offset 0x7D2 18749 bytes
objdata_01_off0000a0c7.bin
3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc		 rtf-objdata-decoded RTF \objdata at offset 0xA0C7 2632 bytes
objdata_02_off0000b66a.bin
142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78		 rtf-objdata-decoded RTF \objdata at offset 0xB66A 12297 bytes

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