Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b8c96da3816f1fd6…

MALICIOUS

RTF / .DOC

824.7 KB Created: 2019-12-20 17:39:00
MD5: a88e7e3d43555379d080b7ee0ac6feb5 SHA-1: 8254c5c9d1836612e2f1d6df28fa25c4f6aff5ee SHA-256: b8c96da3816f1fd60e99c32c7cbb196859827c954d0b9cc75472269e4d399c33
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The RTF document contains embedded OLE objects, with a critical heuristic indicating exploitation of CVE-2017-8759. This vulnerability is known to be leveraged by attackers to execute arbitrary code when the OLE object is activated. The presence of the URL http://schemas.microsoft.c, although benign-looking, is associated with the embedded object, suggesting it might be part of the exploit chain or a lure.

Heuristics 5

  • 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 3 \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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003134.bin
410b4fe96bce8bef04248efb52ec604b2f4528dcc1185964ade3e2037f729448		 rtf-objdata-decoded RTF \objdata at offset 0x3134 127534 bytes

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