Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 935a394128e7c42b…

MALICIOUS

RTF / .DOC

281.0 KB Created: 2023-08-07 08:57:00 First seen: 2023-08-15
MD5: 117d9138f0db7fa7373f336234472248 SHA-1: 24bdaa4d25737a79190c8a36c5a22cb159c118fb SHA-256: 935a394128e7c42b915d94309d81b6c5111641651cfaa1b8c6db2e0095b7110f
242 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1059 Command and Scripting Interpreter T1137 Exploitation for Client Execution T1137.003 DLL Side-Loading

The RTF document contains embedded OLE objects that trigger vulnerabilities CVE-2017-8570 and CVE-2017-8759. These vulnerabilities allow for the execution of arbitrary code, likely to download and execute a second-stage payload. The use of Composite Monikers and OLE activation points directly to these specific exploits.

Heuristics 7

  • 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.
  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000aa91.bin
ac65f867a5682d24bc9de115112c01477a3e087b8516766f3a81387aaa663f1d		 rtf-objdata-decoded RTF \objdata at offset 0xAA91 26916 bytes
objdata_01_off000185df.bin
bab0c23e2be01bc86c53ff980665b71f5d0fd194befd01a135fc687d3a12bc09		 rtf-objdata-decoded RTF \objdata at offset 0x185DF 2632 bytes
objdata_02_off00019b82.bin
142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78		 rtf-objdata-decoded RTF \objdata at offset 0x19B82 12297 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.