Malicious RTF — malware analysis report

Static analysis result for SHA-256 2644d5522d7f5f65…

MALICIOUS

RTF

5.9 KB Created: 2014-08-02 01:43:00 First seen: 2017-05-03
MD5: 661773a36c149ea4a9af5bec87399320 SHA-1: b77d873ae240e6c3e5076f778fd6c82cd7c547a1 SHA-256: 2644d5522d7f5f652f7df68f216269a98e0c8039ca63ed0796e921123846a3fe
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-0199 to download a secondary payload from 'http://dintandnesin.ru/123.xls'. The document also contains a lure instructing the user to 'Enable Editing', which is a common tactic for macro-based malware droppers. The embedded OLE object and the lure strongly indicate a malicious intent to execute remote code.

Heuristics 7

  • 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.Dropper.Agent-6306002-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6306002-0
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://dintandnesin.ru/123.xls 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_off000002e1.bin rtf-objdata-decoded RTF \objdata at offset 0x2E1 2593 bytes
SHA-256: c6b882c6ca857326a26ee4ea063d76c16420d8b6c5a2f6f514040f29bb4ecbf5

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