Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d1e84cab5bf5eadd…

MALICIOUS

RTF / .DOC

944.7 KB Created: 2019-09-17 13:59:00
MD5: bc1c94e783483f1c218efb5dcaf5f67e SHA-1: 7747c98d3d2da16f6e8b2fc56bd0e84532e3a543 SHA-256: d1e84cab5bf5eadd159b04374dce5a78a0e93156086475d41ad86665357dfc66
200 Risk Score

Malware Insights

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

The file is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-8759). The presence of OLE object data and the explicit firing of the RTF_EQUATION_EDITOR and CVE_2017_8759 heuristics strongly indicate exploitation of this known vulnerability for client-side execution. The embedded URL, while benign, is associated with the document structure.

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_off000d9bb4.bin
c815736eecd4508b0a52408ff7fa1295f5abc927c2548f6b33867a1140b1d023		 rtf-objdata-decoded RTF \objdata at offset 0xD9BB4 3732 bytes

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