Malicious RTF — malware analysis report

Static analysis result for SHA-256 305e3ef413049aa2…

MALICIOUS

RTF

5.6 KB First seen: 2017-11-20
MD5: 0e42801c803d138e5a54122cf21f8a4c SHA-1: bd7a621a2725c77920290f886360249bca57df67 SHA-256: 305e3ef413049aa220a9c1d94ac2ed08f9da1a6f940f92f3dafc62809159c07d
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data and is flagged for CVE-2017-0199 exploitation. This vulnerability is used to automatically link to and update an OLE object from a remote URL, specifically http://GreatMike.crabdance.com:162/test.docx, which likely serves as a dropper for a secondary payload. The file's structure and heuristic firings strongly indicate its malicious intent as an exploit delivery mechanism.

Heuristics 6

  • 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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • http://GreatMike.crabdance.com:162/test.docxIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: 4c752fd9d3a7f164679b741e974b6012f2b7fbb58c57973ce5d3fb6b485cb571

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