Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ba20ef43f90ea43d…

MALICIOUS

RTF / .DOC

411.3 KB Created: 2019-09-17 13:59:00
MD5: 8663f1e1bbf7b457580bf1bd89c68572 SHA-1: 04dc8077002e2f572a3111b0e1b6a906066e4bba SHA-256: ba20ef43f90ea43d6893e26f0e2b875ab46f9b6f59a0bf0452077ba1fb008372
200 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate the exploitation of CVE-2017-8759, which allows for arbitrary code execution. The embedded URL, while benign, is part of the document structure that facilitates the exploit. The primary attack vector is the exploitation of the Equation Editor vulnerability to achieve code execution.

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_off000629ee.bin
6d08423027856d97c8b2014a0423585e56c80cb007313c7a810c6f13f89bad65		 rtf-objdata-decoded RTF \objdata at offset 0x629EE 3739 bytes

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