Malicious RTF — malware analysis report

Static analysis result for SHA-256 3c96edd2b19b5c1d…

MALICIOUS

RTF

104.5 KB Created: 2019-05-07 23:06:00 First seen: 2021-06-13
MD5: f37b58a87109bb7d2d356ffb76ad590c SHA-1: 4eaea6bc1a11f083fe20a0b06824144629675183 SHA-256: 3c96edd2b19b5c1d02007406396ada47a8aedbb778031000c208549de9a7db68
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that triggers the ".objupdate" directive, which is known to exploit the CVE-2017-8759 vulnerability in MSXML SAX. This vulnerability allows for the execution of arbitrary code when the OLE object is activated. The embedded URL is confirmed benign and does not contribute to the malicious activity.

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 1 \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.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000349e.bin rtf-objdata-decoded RTF \objdata at offset 0x349E 16443 bytes
SHA-256: 1c678901ad5588f43ebc5a7aa69d10747729f54860f1bc4bd2a10f94de7462c7

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