Malicious RTF — malware analysis report

Static analysis result for SHA-256 b19483cd96ff036b…

MALICIOUS

RTF

5.1 KB First seen: 2017-11-29
MD5: 6bde0e47a2c6fe0a8f0025aaee6209a6 SHA-1: d5012fb1d24719edef4db74ad2da3a3f8e621d98 SHA-256: b19483cd96ff036b23b1e38ff23c09df1eabf0674fdb59bf318063a43e10ca14
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object with an automatically linked and updating object, indicative of CVE-2017-0199 exploitation. This vulnerability is used to fetch and execute a secondary payload from the embedded URL http://aaronvowles.co.uk/cim/sv/checks.hta. The file's structure and the specific exploit targeted suggest a downloader or initial access mechanism.

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/cim/sv/checks.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003e.bin rtf-objdata-decoded RTF \objdata at offset 0x3E 2594 bytes
SHA-256: fe9ccbcbdded2cc5b2b9d17bc0e17c715804cb07dc400392b2c18ff64f8f8a12

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