Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 22e397cec214f7ba…

MALICIOUS

RTF / .DOC

1.74 MB Created: 2019-09-17 13:59:00
MD5: ff6467173b6fe7e3daa6f9003265a30c SHA-1: 0af9afddeebed6bfad1cc8057868ae816943886a SHA-256: 22e397cec214f7ba74f0b8982d31018155a267f106903c634222e8bd644f7f18
200 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and specifically triggers the Equation Editor, indicating exploitation of CVE-2017-8759. This vulnerability allows for the execution of arbitrary code, likely to download and execute a second-stage payload. The presence of RTF_OBJDATA and RTF_OBJUPDATE heuristics further supports the exploitation of embedded objects for malicious purposes.

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_off001a8823.bin
ae9d1f457655fc7abfd7289e785f5b71204f79d6cc3ac2965408c68b8e9c16f7		 rtf-objdata-decoded RTF \objdata at offset 0x1A8823 3732 bytes

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