Malicious RTF — malware analysis report

Static analysis result for SHA-256 8b5cc06e4eb69e89…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-27
MD5: 506a75f017f7aecd900cd5635625874c SHA-1: 3bb924187d4b5d47f4f3f9aa69ae8aa96a142c6f SHA-256: 8b5cc06e4eb69e8921735d5dd89a4398216d2c631a5933b4e042e6bb8494540c
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, exploiting CVE-2017-0199. This vulnerability allows the file to fetch and execute a remote document from the URL http://192.168.217.139/raj.doc, indicating a dropper functionality. The ClamAV detection 'Doc.Dropper.Agent-7141434-0' further supports this assessment.

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: Doc.Dropper.Agent-7141434-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7141434-0
  • 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://192.168.217.139/raj.doc 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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: 705e50cbdd403a1fd4c70df11afc9815dac3f8617a327a56d7723a9f5f854afb

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