Malicious RTF — malware analysis report

Static analysis result for SHA-256 cb30058013faed16…

MALICIOUS

RTF

2.43 MB Created: 2019-09-17 13:59:00
MD5: 6601211ba6533afdf6a2414a90b1f374 SHA-1: 9d14e0e030f1af92a168662ef2556c99371fd256 SHA-256: cb30058013faed163ca721e3818ae8c1429adeb96b74e53db2640cf27432da83
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The RTF document contains OLE object data and triggers OLE activation via \objupdate, indicating an attempt to exploit vulnerabilities. Specifically, the critical heuristic firing for CVE-2017-8759 confirms the exploitation of MSXML SAX OLE activation. This suggests the document is designed to deliver a malicious payload by leveraging this known vulnerability.

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off002642e0.bin
37cdb3eb66e666e80ac1fbd17a3cfee1bd3ed84421ef19bd5f400499dc44ba61		 rtf-objdata-decoded RTF \objdata at offset 0x2642E0 1435 bytes

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