Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 aaa18f0745796abb…

MALICIOUS

RTF / .DOC

774.7 KB Created: 2019-09-17 13:59:00
MD5: ea321a68166c836d5902a47b29e2f210 SHA-1: f9ad57857822407355ad8274a77707121719eaae SHA-256: aaa18f0745796abb7833024b664413a4859e12f2350ae17a47439a442d0ade04
200 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object, specifically triggering the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability in MSXML SAX that allows for OLE activation. This suggests the document is designed to exploit this vulnerability to achieve code execution, likely to download and run a secondary payload.

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_off000bb940.bin
c248187349f177fa36e39ea1be3d7e566fad9ea6e959d57b48fe87a19987f917		 rtf-objdata-decoded RTF \objdata at offset 0xBB940 3739 bytes

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