Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 dd6f2ad2370d52c7…

MALICIOUS

RTF / .DOC

242.3 KB First seen: 2023-03-17
MD5: 364dc6c0e8a18b796aa535516d04cb53 SHA-1: da1e74c37691d9fd57eb2e73ef89b3aacbaa23d2 SHA-256: dd6f2ad2370d52c77db8f3659c116f15c1897e2528694fe9f046be45928a2608
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious File T1059 Command and Scripting Interpreter

The sample is an RTF document that leverages CVE-2017-8570, a vulnerability associated with composite monikers in OLE objects. The document body contains a common social engineering lure, instructing the user to 'Enable Editing' to view the content. This suggests the file is designed to exploit the vulnerability upon user interaction, likely to download and execute a secondary payload.

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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000ba6.bin
9a67cc2bd2acaa5041e98b469fa04516cdfffbfb1bb5c4e717c1c088fbc6f872		 rtf-objdata-decoded RTF \objdata at offset 0xBA6 27423 bytes
objdata_01_off0000eb14.bin
a6611d501e579ac96404a9c19f7f70ee1bd26c5f4967cc103af51e1fde90fca8		 rtf-objdata-decoded RTF \objdata at offset 0xEB14 2632 bytes
objdata_02_off000100b7.bin
142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78		 rtf-objdata-decoded RTF \objdata at offset 0x100B7 12297 bytes

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