Malicious RTF — malware analysis report

Static analysis result for SHA-256 d4b784c04f14cb40…

MALICIOUS

RTF

5.2 KB First seen: 2017-11-20
MD5: 49de6d396b42b99d682f96778ae5e97c SHA-1: ee69ba82d5004de9c97d6759ca5978cd9e0b17f8 SHA-256: d4b784c04f14cb402ef57b4fad4e51a84638c372853b41acec767d7cc821cd6a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and is weaponized with a URL exploiting CVE-2017-0199. This vulnerability allows the file to automatically download and execute a secondary payload, identified as 'wise.hta', from the malicious domain 'bellasimpson.com'. The embedded OLE object and automatic linking heuristics indicate a clear intent to execute remote code.

Heuristics 5

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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://bellasimpson.com/wise.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003f.bin rtf-objdata-decoded RTF \objdata at offset 0x3F 2614 bytes
SHA-256: d792fa199b8a295db259e8e899801aea5f342fbdb6deb2e518724837bb475400

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