Malicious RTF — malware analysis report

Static analysis result for SHA-256 5940e82fb9137609…

MALICIOUS

RTF

5.5 KB First seen: 2017-09-14
MD5: f1d5e873dabb57c3ab48b446a53ebdf0 SHA-1: 85a7c9dbde485cc3a6c1f93d9d131e8995942812 SHA-256: 5940e82fb9137609441b367bdc565f1ebd3ebc8daea45956b85b90286bf1cab7
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and is configured to automatically update and activate it. This functionality is leveraged to exploit CVE-2017-0199, which allows for the execution of remote code by downloading a secondary payload from the specified URL. The embedded URL points to a resource that is likely the next stage of the attack.

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://192.168.56.1/logo.doc In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000015d.bin rtf-objdata-decoded RTF \objdata at offset 0x15D 2601 bytes
SHA-256: c4bbf4cd5e0fef7949413a26bc5cab4a2c62e04af473df24a15ada3b5f07a7b7

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