Malicious RTF — malware analysis report

Static analysis result for SHA-256 5292934ddc5afce4…

MALICIOUS

RTF

516.8 KB Created: 2015-07-10 13:04:00 First seen: 2015-09-19
MD5: 22f6a7ffdc61e79b985ce96731fc1240 SHA-1: e6be5b30ae603890eb3a335c3b0a0d7bb80b93bd SHA-256: 5292934ddc5afce42c50f756fa663556a877c1445f9302b188d840a15ceecc9f
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: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • 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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000028e4.bin rtf-objdata-decoded RTF \objdata at offset 0x28E4 236157 bytes
SHA-256: e79c9fdc6317e8edd6837becd1fd38b3ee78b852352bcda6f86bbbcb0ff2047c

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