Malicious RTF — malware analysis report

Static analysis result for SHA-256 5dc099cb9fd1cc96…

MALICIOUS

RTF

6.2 KB First seen: 2017-11-20
MD5: 609f93ca3c8e3a27530eff0d031b55be SHA-1: 2e3a371a503e2f88502cb61a83595c8178c4fbc1 SHA-256: 5dc099cb9fd1cc961e1889700667189288cb579331d8b340db0bd4a9ea12c939
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 the CVE-2017-8759 vulnerability, which allows for Remote Code Execution via SOAP Moniker. This indicates the file is designed to exploit this vulnerability to download and execute a secondary payload. The ClamAV detection name further supports this, identifying it as a downloader for this specific CVE.

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_off0000003e.bin rtf-objdata-decoded RTF \objdata at offset 0x3E 3125 bytes
SHA-256: fc05b26463d8dcf2a8fa218a0f16a0355a2e3e5bdeed7e8fbae9efa3ac38e174

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