Malicious RTF — malware analysis report

Static analysis result for SHA-256 a500ef528855f968…

MALICIOUS

RTF

40.5 KB Created: 2017-08-22 04:22:00 First seen: 2017-08-27
MD5: 18f93476e92ca2b36cd38c6d9037567c SHA-1: 98ba0c3aa1d8a0f94840cb19467c1b9eaff2b291 SHA-256: a500ef528855f968e2dd463c25898a98210857cdd1baa06af7c066a716f75c17
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-0199, a vulnerability related to remote URL monikers. This exploit is designed to download and execute a secondary payload from the specified URL, http://192.168.50.250/ms.rtf. The presence of the OLE object and the critical heuristic firing for CVE-2017-0199 strongly indicate malicious intent.

Heuristics 5

  • 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.
  • 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://192.168.50.250/ms.rtf In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000028b2.bin rtf-objdata-decoded RTF \objdata at offset 0x28B2 2601 bytes
SHA-256: 516a759ed0dd81255a757428e45107c8c3688cc166ce484ee991b2b3873ce9c2

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