Malicious RTF — malware analysis report

Static analysis result for SHA-256 2781526f6b302da0…

MALICIOUS

RTF

3.73 MB Created: 2017-06-01 18:31:00 First seen: 2018-09-04
MD5: a5173e435b47cfa73c0c01d58abe28da SHA-1: a900f555031d1bb53102b5f747fc471a3118654a SHA-256: 2781526f6b302da00661b9a6a625a5a6ecf4ffccafa61202e9b0e9b61b657867
202 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects, specifically a package object, which is a strong indicator of malicious intent. The critical heuristic firing for CVE-2017-8759 confirms that the file exploits this vulnerability for client execution. The ClamAV detection further supports the malicious classification. The embedded URL is benign and likely a red herring.

Heuristics 6

  • 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.
  • ClamAV: Win.Phishing.Suspicious-6355521-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Phishing.Suspicious-6355521-4
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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_off003a755a.bin rtf-objdata-decoded RTF \objdata at offset 0x3A755A 3265 bytes
SHA-256: 4e129f49d43df5666a854e84ee460134dece92de9489472afc4931a520a156c5

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