Malicious RTF — malware analysis report

Static analysis result for SHA-256 ece09fdc9a4059ed…

MALICIOUS

RTF

86.4 KB Created: 2017-11-07 09:58:00 First seen: 2017-11-13
MD5: b0ba26b211e160e4a302305b00bf7648 SHA-1: 970acf279dd715d0228a138d151806096eda9cd4 SHA-256: ece09fdc9a4059ed27c196ed7fc7bf555d021ceb101895206b7ef4ee77aeab2b
282 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, a known vulnerability for remote code execution via OLE object linking. The embedded URL http://103.194.170.48/bbs.doc is likely the source of a secondary payload. The heuristic 'SE_ENABLE_LURE' suggests the document prompts the user to enable editing, a common tactic for malicious documents.

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_off00002bd9.bin rtf-objdata-decoded RTF \objdata at offset 0x2BD9 4708 bytes
SHA-256: da8cb3d0673d49abf64b023854b65d43cdea43f5a079ed2638a4c8f285ee12fc
objdata_01_off000053cb.bin rtf-objdata-decoded RTF \objdata at offset 0x53CB 4896 bytes
SHA-256: db434db6bc1e04a1c70207260e398f936846f9884388fb89b025f78c06b8fe4f

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