Malicious RTF — malware analysis report

Static analysis result for SHA-256 3a35b03169f7d458…

MALICIOUS

RTF

2.41 MB Created: 2017-11-22 04:44:00 First seen: 2017-11-29
MD5: 709beece8c0d2cacaf51e0091723aa2c SHA-1: 712a0c6688a1d96a3c2b6f2fbd3be0d4b37ab07d SHA-256: 3a35b03169f7d458c1c78cdd11d938a12c16427c8b6c229ffae74c152e4f0fbd
302 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-0199 and CVE-2017-8759. These vulnerabilities are often used to download and execute arbitrary code. The embedded URL http://kinesk.com/t/t.php?thread=2&t=h is highly suspicious and likely serves as the initial download point for a secondary payload. The presence of large amounts of hex-encoded data within OLE objects further suggests the hiding of malicious content.

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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2476KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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.
  • 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://kinesk.com/t/t.php?stats=send&thread=2 In RTF body
    • http://kinesk.com/t/t.php?thread=2&t=hIn 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_off0025f3f1.bin rtf-objdata-decoded RTF \objdata at offset 0x25F3F1 5148 bytes
SHA-256: cb5709bead5afeec41d25beb455431eb77370163cfe80213ff0f5c9fc2e43b7a
objdata_01_off00261ee9.bin rtf-objdata-decoded RTF \objdata at offset 0x261EE9 4312 bytes
SHA-256: 27be49a12d3f931e036d69a03bfe4167b94f582465604ac3361c509c63272273

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