Malicious RTF — malware analysis report

Static analysis result for SHA-256 210956c21511dbcd…

MALICIOUS

RTF

340.0 KB Created: 2020-12-23 15:44:00 First seen: 2020-12-28
MD5: 179f4be64437ce559ac5530743065e04 SHA-1: c85b61fe3e538bd08042a24e37033e15333b5c95 SHA-256: 210956c21511dbcde615b8607391fdf973b5846b4197ee7b82d4b05bc6ce2bd5
162 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object, specifically leveraging the Equation Editor, which is known to be vulnerable to CVE-2017-8759. This vulnerability allows for the activation of MSXML SAX, leading to the execution of arbitrary code. The presence of the OLE object and the critical heuristic firings strongly indicate an exploit attempt.

Heuristics 5

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.
  • 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_off00000c7f.bin rtf-objdata-decoded RTF \objdata at offset 0xC7F 169 bytes
SHA-256: cde21ee848b11e4fba463f974912833ef23239727f71cb9d00f2f73903dfb62a

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