Malicious RTF — malware analysis report

Static analysis result for SHA-256 39a3f26ff7a02c43…

MALICIOUS

RTF

4.09 MB Created: 2017-06-12 14:54:00 First seen: 2019-04-18
MD5: 325844f1b956c52fc220932bc717f224 SHA-1: 8a20d042b74ad8406e86ca3c13bb577eb83bad64 SHA-256: 39a3f26ff7a02c43327f457916220d542c91cd9726a3d0e7610b89c0bc96f038
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_off003fc6ef.bin rtf-objdata-decoded RTF \objdata at offset 0x3FC6EF 12378 bytes
SHA-256: fec0a769e0c23bdbc0f1ffda7844867b481107f7090c30f8e869e6900c62e432

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