Malicious RTF — malware analysis report

Static analysis result for SHA-256 a911b22300c52dc3…

MALICIOUS

RTF

79.0 KB Created: 2017-10-03 14:12:00 First seen: 2017-10-10
MD5: 7300e40f2d87227676e3e9b3bdfde851 SHA-1: 6e09ab7b7f2fcc781712801d51e73636bb733e4b SHA-256: a911b22300c52dc395bc47f151ba2e45dd149cdc422fb879111a7f6e2a60703e
302 Risk Score

Malware Insights

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

The RTF file contains critical heuristic firings for CVE-2017-0199, indicating it exploits a vulnerability in MSXML OLE activation. The embedded URL 'http://localhost:8008/management/host/log.txt' is likely used to download a secondary payload. The presence of OLE object data further supports the exploitation vector.

Heuristics 8

  • 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.
  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • 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://localhost:8008/management/host/log.txt 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_off00002a31.bin rtf-objdata-decoded RTF \objdata at offset 0x2A31 5633 bytes
SHA-256: 0b91e475af3b77fb165d45de3f3d2a2e3cb19f9633586ec7f9d92c002ac8cacd
objdata_01_off0000aeec.bin rtf-objdata-decoded RTF \objdata at offset 0xAEEC 3714 bytes
SHA-256: 687a6b2203f0d8b1c5f9d6782a1b317a11d1e39bdbfc668ef3acb894d1c6f601

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