Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 87a90a46cee92bc5…

MALICIOUS

RTF / .DOC

2.11 MB Created: 2019-09-17 13:59:00
MD5: c6d075bc6fcf4d933f3fa8ba85a0c253 SHA-1: 2879a51e386f8ac3c97b8dcdc821cfcbad0bca10 SHA-256: 87a90a46cee92bc5dd281628f12b2431fc418f3eab21afb6bde86d59d470ca5b
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 exploitation of CVE-2017-8759, which allows for arbitrary code execution. The embedded object data is likely a payload designed to be activated by the ".objupdate" field, leading to the execution of malicious code.

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_off001fbb92.bin
d6aac570fd089b74a70094e64b5bd4778ca606f97f357cb51628f65ba57891a0		 rtf-objdata-decoded RTF \objdata at offset 0x1FBB92 3732 bytes

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