Malicious RTF — malware analysis report

Static analysis result for SHA-256 95254b96c46f6a40…

MALICIOUS

RTF

49.7 KB Created: 2019-08-10 21:37:00 First seen: 2021-10-16
MD5: 8386a5c8a73570bd754b9d5935a2d43d SHA-1: 303174dadd52d695cdf93b72ce073cb78ef12379 SHA-256: 95254b96c46f6a40ce0e5c983a638a7a4eddcf2a603ebee0ef03a160a07db487
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded Equation Editor OLE object, which is a known vector for exploiting CVE-2017-8759. This vulnerability allows for the execution of arbitrary code when the object is activated. The presence of the Equation Editor CLSID and object class firings strongly indicates this exploitation attempt.

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
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • 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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002f55.bin rtf-objdata-decoded RTF \objdata at offset 0x2F55 3962 bytes
SHA-256: 15c78adec5f2e41fc15f5e9646856f9fdb84ae1c6e23619937b4ebd206168a66

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