Malicious RTF — malware analysis report

Static analysis result for SHA-256 ffebcc4d2e851bae…

MALICIOUS

RTF

3.85 MB Created: 2017-06-08 18:20:00 First seen: 2019-04-18
MD5: c0eba408923c9c60fd4b02fa49c2c8fb SHA-1: 132ba0781eb8483d1bafa5d7b22f44599523d852 SHA-256: ffebcc4d2e851baecd89bf11103e3c9de86f428fdeaf0f8b33d9ea6f5ef56685
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 exploitation of a known vulnerability in MSXML SAX OLE activation. This vulnerability is commonly used to execute arbitrary code, likely leading to the download and execution of a secondary payload, as suggested by the ClamAV detection name 'Win.Phishing.Suspicious'.

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.co In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off003c6904.bin rtf-objdata-decoded RTF \objdata at offset 0x3C6904 3255 bytes
SHA-256: bd6e19a540a9f3b6e81775f82e401f295c7b936bff3c6d8eab338ec4bbf9147c

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