Malicious RTF — malware analysis report

Static analysis result for SHA-256 e5e487bcd2481dc3…

MALICIOUS

RTF

57.0 KB Created: 2018-09-20 14:23:00 First seen: 2018-11-05
MD5: e89241a107e4992ad9b3a57b407d0867 SHA-1: 1b8bfdaa64ee7a85ea223ac37660234dce1abc41 SHA-256: e5e487bcd2481dc382a5b3ed39a81b4b727366547ca48764e72f22e5927779ae
282 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is known to download and execute remote content. The embedded URL http://192.168.22.133:8881/test/test.rtf is highly suspicious and likely points to the secondary payload. The file's purpose is to exploit this vulnerability to achieve initial execution.

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://192.168.22.133:8881/test/test.rtf In RTF body
    • http://schemas.microsoft.com/In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003889.bin rtf-objdata-decoded RTF \objdata at offset 0x3889 2601 bytes
SHA-256: 7f300e908dd1976df41b69f213c20cdfdb3a3b5f7d08dfe3b39aeea1cd363b93

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