Malicious RTF — malware analysis report

Static analysis result for SHA-256 7a607c27ce31a8ae…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-08
MD5: 9ca9bc7dbaffa82b89297465c0d02326 SHA-1: 86bb0df39c45f7b2c9193dbb527c7f62f125d7bb SHA-256: 7a607c27ce31a8ae90f98aede425917f65fdf13a50133778709c5531119d350b
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains heuristics indicating the exploitation of CVE-2017-0199, which is a known vulnerability for remote code execution. The exploit targets an OLE object and attempts to download a secondary document from the specified URL. This indicates a likely attack pattern involving a malicious attachment designed to download and execute further stages of malware.

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://192.168.2.9/raykoo.doc 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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: c4bf2cd9bbcfd29979e9db745d50734395a1196fa5aff1bdff05ecf8d2adeae2

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