Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2377d61c53819665…

MALICIOUS

RTF / .DOC

798.4 KB Created: 2019-12-20 17:39:00
MD5: cd3f3c1dc1cddcdf0c89975b6e513f16 SHA-1: fb04cc2bac42103c59241b5dc56931007a36ac9a SHA-256: 2377d61c538196654d62b670d92e4361c8f5c6fe18f1732758eb3e271bb4f46d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects. Heuristics indicate the exploitation of CVE-2017-8759, which is a known vulnerability in MSXML that allows for OLE object activation. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely to download and run a secondary payload. No specific family could be identified.

Heuristics 6

  • 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.
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://schemas.microsoft.c

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000436cf.bin
6df66f29e94bd3d96d287e0321ec9fb79b9189bc1cc65db00baf4d892e20faba		 rtf-objdata-decoded RTF \objdata at offset 0x436CF 121902 bytes

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