Malicious RTF — malware analysis report

Static analysis result for SHA-256 c7fa6f27ec4f4142…

MALICIOUS

RTF

63.1 KB Created: 2017-09-15 05:50:00 First seen: 2017-10-10
MD5: e1512a0bf924c5a2b258ec24e593645a SHA-1: 5e39ea9a92662270f616860546277eaa3703ca8a SHA-256: c7fa6f27ec4f4142ae591f2dd7c63d046431945f03c87dbed88d79f55180a46d
242 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 related to CVE-2017-8759, indicating exploitation of a SOAP Moniker vulnerability. This vulnerability is commonly used to download and execute arbitrary code, likely a secondary payload. The document itself appears to be a benign field trial log, suggesting the malicious content is entirely within the embedded OLE object.

Heuristics 7

  • 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
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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_off00006eb9.bin rtf-objdata-decoded RTF \objdata at offset 0x6EB9 3748 bytes
SHA-256: 2497009409f70ffc5bfb9e619aabbe11cbcc334e6102519d03f5f6c406809d5c

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