Malicious RTF — malware analysis report

Static analysis result for SHA-256 4c722b5c01a7ded3…

MALICIOUS

RTF

3.79 MB Created: 2019-09-17 13:59:00
MD5: 2bee61c5ee63bc27f5ea66e2d42e136d SHA-1: bd3900aa0f468a4fbb9ea3046959254e276ad394 SHA-256: 4c722b5c01a7ded39eed2b06d3e4aee0fbc9e23bb1c71b329390dd12235dd27e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-8759 vulnerability via the Equation Editor. This indicates an attempt to exploit a known vulnerability for code execution. The presence of ` tfobjdata` and ` tfobjemb` sections further supports the exploitation of embedded objects. No scripts were extracted, and the document body was heavily obfuscated, but the critical heuristics point to a reliable exploit delivery mechanism.

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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off003b8e60.bin
ba61f101bf1576875f372d2041b59c3d2ad9f09080d85747f7a971c8d9684d8a		 rtf-objdata-decoded RTF \objdata at offset 0x3B8E60 3732 bytes

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