Malicious RTF — malware analysis report

Static analysis result for SHA-256 7f6700b92dcb7eef…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2018-10-07
MD5: 2e0dfab40886b5f333e17881e7338eb4 SHA-1: e262f04982b3eba76efd2377e396c38d9e0257f3 SHA-256: 7f6700b92dcb7eeff5ea9d6cd582962caa92a684fdf051dd19b116403d001b7d
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 leverages CVE-2017-0199 to fetch and execute a remote exploit from the URL http://192.168.5.130/exploit.html. This indicates a malicious document likely delivered as a spearphishing attachment, designed to exploit a known vulnerability for initial execution.

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://192.168.5.130/exploit.html In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000104.bin rtf-objdata-decoded RTF \objdata at offset 0x104 2724 bytes
SHA-256: 4d47e2846b18fcc52a5d26fa28d2f2eb1637d4ab749256280334c1fd94834c5b

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