Malicious RTF — malware analysis report

Static analysis result for SHA-256 aa064dc5e176ca10…

MALICIOUS

RTF

267.9 KB Created: 2017-04-27 18:26:00 First seen: 2019-04-18
MD5: 26b8fc083100c52774c612639e1ba9db SHA-1: 19f20958836fa7681e1a7230ea6b9f781be66882 SHA-256: aa064dc5e176ca1018f0e0bd802ba1d3c09909c9aca77110291f81c9d5ada2f6
302 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 and CVE-2017-8759, which are known vulnerabilities for remote code execution. The file attempts to download a secondary payload from the URL http://213.184.123.144/mark.doc, suggesting it acts as a downloader for further malicious activity. The presence of OLE object data and automatic linking further supports the exploit mechanism.

Heuristics 8

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • 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://213.184.123.144/mark.doc In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c35.bin rtf-objdata-decoded RTF \objdata at offset 0x2C35 45582 bytes
SHA-256: 3c3285e85c4d5040be1f6f74420502595ab4c3c683c3dfd657f0280176a476ce

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