Malicious RTF — malware analysis report

Static analysis result for SHA-256 d087c963c21b6366…

MALICIOUS

RTF

6.2 KB First seen: 2017-11-20
MD5: b9d9ed8e4ec4de2cf69754a2572a0ad2 SHA-1: 8feebd326272173b0b27148c897c0aab2b98ae1b SHA-256: d087c963c21b6366f2504be11420e600efea47ee168e6388cf3cdf60b59c63c3
220 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data that leverages the SOAP Moniker vulnerability (CVE-2017-8759). This vulnerability allows for remote code execution, enabling the file to download and execute a secondary payload. The ClamAV detection name further confirms the nature of this exploit 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_off0000003e.bin rtf-objdata-decoded RTF \objdata at offset 0x3E 3125 bytes
SHA-256: 56c87e32bcc75caab70049e0188315d1e7900e6dfc4bc594da39efd721e69705

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