Malicious RTF — malware analysis report

Static analysis result for SHA-256 44c847e0c30ef03d…

MALICIOUS

RTF

6.1 KB First seen: 2017-11-20
MD5: 6d6935ffbad280a3eff20804c09e828f SHA-1: 4cfcbf7cfa53a5062bf88966922189b6d46b6022 SHA-256: 44c847e0c30ef03d391544e7dfaa76e0d3828d4360b19febb6d1d965420678d9
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, a known technique for exploiting CVE-2017-0199. This exploit is used to download and execute a second-stage payload from the embedded URL http://bellasimpson.com/rev.hta. The embedded object data and automatic linking 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://bellasimpson.com/rev.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 3115 bytes
SHA-256: 330e07f58e72084d01a3d85a097f4bc394bd1c132d742e89e272e5808bfb32de

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