Malicious RTF — malware analysis report

Static analysis result for SHA-256 90232e3a11c1e5e9…

MALICIOUS

RTF

6.1 KB First seen: 2017-12-08
MD5: a67f10cb275ee14ced5bc9fd34c93ad8 SHA-1: 1e3dc2eea0498cb0dfdb83a3aa5c87327b242c03 SHA-256: 90232e3a11c1e5e9e110c901ce208c2e12bf785564926e5d731551c37a852890
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that is automatically linked and updated, triggering an exploit for CVE-2017-0199. This exploit is designed to download and execute a secondary payload from the embedded URL http://aaronvowles.co.uk/bnsports/mz/sec.hta. The embedded object data and automatic linking heuristics strongly indicate malicious intent.

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://aaronvowles.co.uk/bnsports/mz/sec.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 3113 bytes
SHA-256: 1e409a1d334166ec4bfdba2e5a75ff3b46c8e400d4fe8562be23f70cc4e61344

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