Malicious RTF — malware analysis report

Static analysis result for SHA-256 a69b15ad2f0c5074…

MALICIOUS

RTF

66.6 KB Created: 2017-11-08 11:38:00 First seen: 2017-11-13
MD5: 9bee00f2e07d1ae60e5fa9b4460e27da SHA-1: cefb8c6ca7e0076f99879667c90e2d15b6a63a73 SHA-256: a69b15ad2f0c507400efd6e8df0c5a6ce3dee1d004cc18d62656559ee3d20c77
282 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and exploits known vulnerabilities, specifically CVE-2017-0199 and CVE-2017-8759, to achieve remote code execution. The heuristic firings indicate the presence of OLE object data and automatically linked OLE objects, with critical alerts for the aforementioned CVEs. The document body contains a lure to 'enable editing', suggesting a downloader or dropper functionality. The primary IOC is the remote URL used in the CVE-2017-0199 exploit.

Heuristics 8

  • 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.
  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://103.194.170.48/bbs.doc In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002bd7.bin rtf-objdata-decoded RTF \objdata at offset 0x2BD7 4708 bytes
SHA-256: 6487220d2d1cf75c552e50511d96a4c4a2bd87603d4c12d10563917d84cf6343
objdata_01_off000053c9.bin rtf-objdata-decoded RTF \objdata at offset 0x53C9 4896 bytes
SHA-256: b3253e08473dfdf4f1679cbed8476f02f1082b032c9cfbc63bc5a655e16e5c24

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