Malicious RTF — malware analysis report

Static analysis result for SHA-256 e36f042cdbae964f…

MALICIOUS

RTF

5.2 KB First seen: 2017-10-28
MD5: fdd28d1cafb9e077d47451ece76ec236 SHA-1: 636abdf3abe0604b18cea1225ee0f097b51d5d3c SHA-256: e36f042cdbae964f074dea979aca634af170fc450abf4ba9fdf686b03eec8ed6
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, triggering an exploit for CVE-2017-0199. This exploit is designed to download and execute a remote resource, indicated by the embedded URL http://localhost/rtf.rtf. The ClamAV detection confirms the presence of this known exploit.

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://localhost/rtf.rtf In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000031.bin rtf-objdata-decoded RTF \objdata at offset 0x31 2601 bytes
SHA-256: f13d77b1de8d660a04d8d3cd56a086051e0fcbed2818afecf5519e05fbcae06b

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