Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 520270adf2f2f690…

MALICIOUS

RTF / .DOC

16.4 KB First seen: 2026-03-27
MD5: 65d42056f48f16bc098f157894341895 SHA-1: 0e60e7aa2833e51fdbaf0495e58b203570492e28 SHA-256: 520270adf2f2f69021713dfaf5c961d88ba8b06a54d85c68b73bc590ef0ef206
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains OLE object data and is embedded with an OLE object. Critical heuristics indicate exploitation of CVE-2017-8759 via MSXML SAX OLE activation and CVE-2026-21509 using the Shell.Explorer.1 CLSID within the RTF's objdata. These vulnerabilities allow for arbitrary code execution.

Heuristics 4

  • 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-2026-21509 — Shell.Explorer.1 CLSID in RTF critical CVE related CVE_2026_21509
    RTF document contains the Shell.Explorer.1 CLSID {EAB22AC3-30C1-11CF-A7EB-0000C05BAE0B} associated with CVE-2026-21509 (OLE/COM Killbit / Protected View bypass). Actively exploited in the wild.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002916.bin
7acc2e1a91414005570b26b310362a84486258c1690f202a448e5ca96477ece2		 rtf-objdata-decoded RTF \objdata at offset 0x2916 2609 bytes

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