Malicious RTF — malware analysis report

Static analysis result for SHA-256 14abb6493254bc4a…

MALICIOUS

RTF

831.6 KB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: fb83b70d2dabd66c68fe3ce7680ae2b4 SHA-1: 68664cb5d2e13865bd14e151a8f3fde86614684d SHA-256: 14abb6493254bc4a102951505f116433048617e6d6b0080c61f57f07b8afbd7d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that is activated via \objupdate, triggering the CVE-2017-8759 vulnerability. This exploit is known to be used for downloading and executing arbitrary code, indicating a likely initial access vector via spearphishing attachment. No specific family could be identified.

Heuristics 5

  • 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.
  • \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 1 \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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000c2314.bin rtf-objdata-decoded RTF \objdata at offset 0xC2314 1413 bytes
SHA-256: 1f05d186099afe7a31b526d38fe3d327e0ccb3e0eab649e55a1ff9f8687fa70f

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