Malicious RTF — malware analysis report

Static analysis result for SHA-256 3a776b527039bb59…

MALICIOUS

RTF

47.1 KB Created: 2017-11-21 11:09:00 First seen: 2017-11-29
MD5: f64cd051efa388f39b2d858a2ca83bdd SHA-1: 778e9c147cd594eee3e54b95c23657860d258a4a SHA-256: 3a776b527039bb59a1d8aacf9c7eb35b82ec1177dc3afd3721beebb34d67861c
182 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 exploit targets the URL http://192.168.174.133/b.php, which is likely used to download and execute a secondary payload. This indicates a malicious document designed to compromise the user's system upon opening.

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.
  • 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.
  • 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://192.168.174.133/b.php 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_off00002c92.bin rtf-objdata-decoded RTF \objdata at offset 0x2C92 2724 bytes
SHA-256: 93021e664cd02163c39c1979ad939864238680d79659c70324511d1cc26a26c0

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