Malicious RTF — malware analysis report

Static analysis result for SHA-256 c3d3dc58af3b8736…

MALICIOUS

RTF

51.7 KB Created: 2017-09-14 12:06:00 First seen: 2017-12-24
MD5: 1856dca8fc4801e6c75d5b1ffa186598 SHA-1: 8e51dd145a32a6e9f64953813a3720d697e83c53 SHA-256: c3d3dc58af3b8736e5b7c74d604e59a8690eda0447ab7ba3147ee2e702629c2c
282 Risk Score

Malware Insights

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

This RTF document exploits CVE-2017-0199, a known vulnerability in Microsoft Office that allows for remote code execution via OLE object linking. The embedded URL 'http://192.168.1.101/VISUALHACK.rtf' is used to download and likely execute a secondary payload. The presence of 'EXPLOIT' in the document body further supports this conclusion.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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://192.168.1.101/VISUALHACK.rtf In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002af2.bin rtf-objdata-decoded RTF \objdata at offset 0x2AF2 2601 bytes
SHA-256: c81edb0505aabb352d74f03872b1bb9f0dbef8386eb4c56ceb9179269803c403

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