Malicious RTF — malware analysis report

Static analysis result for SHA-256 1b44c1693d12a4ac…

MALICIOUS

RTF

2.72 MB Created: 2017-10-26 17:18:00 First seen: 2017-10-28
MD5: b63c51735fc08d6fa284cf2c06dff105 SHA-1: 1171a1df210f58afb9162e8cadbed8fde492a26d SHA-256: 1b44c1693d12a4ac66d2ab6cb458d71f4d295d7c47af4c067f063fe6f4205c74
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 used to download a secondary payload from the URL https://zilk.pw/akx/t.php?thread=0&t=h. The presence of OLE object data and excessive hex data further suggests the embedding 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 ~2811KB 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 https://zilk.pw/akx/t.php?stats=send&thread=0 In RTF body
    • https://zilk.pw/akx/t.php?thread=0&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_off00002a39.bin rtf-objdata-decoded RTF \objdata at offset 0x2A39 4666 bytes
SHA-256: a42e9320aa05063a90445184925935157120ce06ffff3be62004db542ef4709a
objdata_01_off00005260.bin rtf-objdata-decoded RTF \objdata at offset 0x5260 4372 bytes
SHA-256: 58d755c9c2d62a45fc6388a7963dedccb00f9f41db0deb04f43032932e5ab5c8

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