Malicious RTF — malware analysis report

Static analysis result for SHA-256 a64b2a93e90c6d21…

MALICIOUS

RTF

5.1 KB First seen: 2017-11-20
MD5: 596dac3293305f3b06e3d3d3c31e9d25 SHA-1: 028461500d2b6b380a2677e9f33f988f08e5bb46 SHA-256: a64b2a93e90c6d211ac153e42d98ddb0c39c8c97bb718d07a7ba9b133451b982
220 Risk Score

Malware Insights

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

The RTF file contains OLE object data and is flagged for CVE-2017-8759, a SOAP Moniker vulnerability. This indicates the file is designed to exploit this vulnerability to download and execute a secondary payload. The ClamAV detection further confirms its malicious nature as a downloader.

Heuristics 5

  • SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) critical CVE related CVE_2017_8759
    RTF \objdata decodes to OLE data containing the SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • ClamAV: Doc.Downloader.CVE_2017_8759-6413350-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.CVE_2017_8759-6413350-1
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003f.bin rtf-objdata-decoded RTF \objdata at offset 0x3F 2596 bytes
SHA-256: 58bf16e83f8b6bad4b60893727a7e04da4394407e9bd7b52c377ad7bce521688

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