Malicious RTF — malware analysis report

Static analysis result for SHA-256 39aeea7b444a89bd…

MALICIOUS

RTF

16.6 KB Created: 2017-09-16 21:16:00 First seen: 2018-04-23
MD5: 5bd9d9df0bf807c764317c0d015a3465 SHA-1: e7c4ea727872df13b74e334e564bf1b798e61bd0 SHA-256: 39aeea7b444a89bd64ba35ba27885643ac3d219a245da170e0430bba9c6fab23
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data and triggers heuristics for CVE-2017-8759 (SOAP Moniker RCE) and automatic OLE object updates. This indicates the file is designed to exploit a vulnerability to download and execute a secondary payload, likely delivered via spearphishing.

Heuristics 6

  • 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: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • 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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002b1e.bin rtf-objdata-decoded RTF \objdata at offset 0x2B1E 2600 bytes
SHA-256: 4f823e017fc1ce0c310ad6d53a54eb816940e3807a44b9c21c597c55deef45ca

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