Malicious RTF — malware analysis report

Static analysis result for SHA-256 abbf55daa34edf04…

MALICIOUS

RTF

566.1 KB Created: 2017-11-26 23:42:00 First seen: 2017-12-08
MD5: 57afea84ab86183a022022fdcfc98e3c SHA-1: ef00810857b3b58b7557c28e59d804e81d2c8f79 SHA-256: abbf55daa34edf04bdb3327da43d5d001ea865de0e7e394c7f0910df4336cef1
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains OLE objects and triggers an update using \objupdate, indicating an attempt to exploit vulnerabilities. Specifically, the critical heuristic firing for CVE-2017-8759 confirms exploitation of MSXML SAX OLE activation. The document also includes a remote URL via INCLUDETEXT/INCLUDEPICTURE, which is highly suspicious and likely serves to download a secondary payload. ClamAV detection further supports the malicious nature of the file.

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: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • \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.
  • INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE
    RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • 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 https://enterrupted.com/doc/t.php?stats=send&thread=0 In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00017915.bin rtf-objdata-decoded RTF \objdata at offset 0x17915 2598 bytes
SHA-256: b53f3b9c5a48cef440d44bc81296b265deccfdd76396a9d148434ef20b69b1a7
objdata_01_off00019043.bin rtf-objdata-decoded RTF \objdata at offset 0x19043 2674 bytes
SHA-256: b77639590a83a54bb0d3fad680ec2bb346ebcad93280bcba5a54c37f6e148429

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