Malicious RTF — malware analysis report

Static analysis result for SHA-256 97ca312339367294…

MALICIOUS

RTF

71.4 KB Created: 2017-08-03 14:33:00 First seen: 2017-08-08
MD5: 061470d751d6db56e5aafa3d69fbba09 SHA-1: 2e5241e5b346d40c622e242ea678d0604344d194 SHA-256: 97ca312339367294e925e13370ce7c10b4465222faf971ed8b384ea64699e6a3
282 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 SAX OLE activation. This exploit is designed to download and execute a secondary document from the embedded URL 'https://a.pomf.cat/iaqpee.doc'. The presence of OLE object data and automatic linking further supports the exploitation of embedded objects for malicious purposes.

Heuristics 7

  • 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.
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \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://a.pomf.cat/iaqpee.doc In RTF body
    • http://schemas.microsoft.comIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002aa8.bin rtf-objdata-decoded RTF \objdata at offset 0x2AA8 2601 bytes
SHA-256: 992e76a147e70aca3888902b4fd1d1f9d717c46656e4ed2dd0514c27759ce787

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