Malicious RTF — malware analysis report

Static analysis result for SHA-256 18ba4278f126581d…

MALICIOUS

RTF

5.6 KB Authoring application: 5. First seen: 2018-09-04
MD5: 6933d521c1ef1af83407e33b2b899c7c SHA-1: 76e77be68459734f65c67cdd607871c0eaa2db9d SHA-256: 18ba4278f126581db4d44adf5cca24fb35266f4aaeee7a4d7394478ae56fc77d
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that exploits CVE-2017-0199, a known vulnerability for remote code execution. The exploit attempts to download a payload from the URL http://217.23.13.68:8080//. This indicates the file is a dropper designed to fetch and execute further malicious content.

Heuristics 6

  • 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.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • 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://217.23.13.68:8080// In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000f2.bin rtf-objdata-decoded RTF \objdata at offset 0xF2 2724 bytes
SHA-256: 1bab8fcb2d7f991d6bc6fd358f51ef19b97687801917c6f104d8fd01ff83dc68