Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 383d69dfe51a14b9…

MALICIOUS

RTF / .DOC

953.8 KB Created: 2019-09-17 13:59:00
MD5: 11a33e16c3c2dd8cbdd73591297d4942 SHA-1: 390ad1c6bd488e0a6d3d43b7dc3ad585a2d05dee SHA-256: 383d69dfe51a14b98fa2ad6fca4e7febffa0d1bec03e55b8a52617498ef7075c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link T1559.001 Component Object Model Hijacking

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, which is a known vulnerability allowing for OLE activation and arbitrary code execution. The embedded URL, though benign, is present within the document body, suggesting a potential lure or part of the exploit chain.

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_off000e9147.bin
5ef02d9cf62606b4ba0cd6fcebad81cd1857b4c469ff25aab0542e12b433db32		 rtf-objdata-decoded RTF \objdata at offset 0xE9147 3739 bytes

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