Malicious RTF — malware analysis report

Static analysis result for SHA-256 3ea0ac381037b4a0…

MALICIOUS

RTF

44.4 KB Created: 2017-11-15 14:50:00 First seen: 2017-11-20
MD5: 8c71624715f17553c2410747f86d3cb3 SHA-1: fb07c0a8dbd2f732fcb19c0053fc1fbb1b5bdfc3 SHA-256: 3ea0ac381037b4a0caec399e1ec659742a4c00375887a23640ad6ce8b08856b3
142 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 known vulnerability for remote code execution. The embedded URL 'http://185.24.233.170/1/j2.doc' is likely used to download a secondary malicious payload. The document also contains a lure to enable editing, indicating it was likely delivered as a spearphishing attachment.

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.
  • 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
  • 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://185.24.233.170/1/j2.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_off0000338a.bin rtf-objdata-decoded RTF \objdata at offset 0x338A 3640 bytes
SHA-256: a475fc1966f40e31ae5c70f4a48ec3dbd49f3741bfc42c3707f2cf3e159ce057