Malicious RTF — malware analysis report

Static analysis result for SHA-256 00051c72d8634f75…

MALICIOUS

RTF

220.6 KB First seen: 2022-03-31
MD5: d3426b30a225758d0de9fad3eef6d9f4 SHA-1: 96a908b47a813405db1a571729a09dfdd253d4c1 SHA-256: 00051c72d8634f750b166cca0ab1399f3616b325c73d25331a4a491e02a25e3c
180 Risk Score

Malware Insights

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

The RTF file contains OLE object data with a composite moniker, indicating exploitation of CVE-2017-8570. This vulnerability allows for the dropping and execution of a script, likely a second-stage payload. The embedded OLE objects and the specific heuristic firings strongly suggest this attack vector.

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_off000007d0.bin
bd01ae477076fc92bc41a20fb999970e9d464592113df8d60e5bff07a83a0f4b		 rtf-objdata-decoded RTF \objdata at offset 0x7D0 17235 bytes
objdata_01_off00009476.bin
d96306b20df67b297ae373555600b5ea693bd0b69df05a560b4d2ebff69ae93d		 rtf-objdata-decoded RTF \objdata at offset 0x9476 2632 bytes
objdata_02_off0000aa19.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xAA19 12297 bytes

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