Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c1f9c68faa7df68b…

MALICIOUS

RTF / .DOC

1.38 MB Created: 2019-09-17 13:59:00
MD5: 67a9289601453ef7cf0c09e4a1c3117e SHA-1: 344f8ef4df0bc9b696c2418241bb727ab1e328e3 SHA-256: c1f9c68faa7df68b5be60ec5f270e3b95875767267023537d84b1d1faa693d3a
200 Risk Score

Malware Insights

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

The file is an RTF document that contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-8759). The presence of \objupdate indicates that the OLE object is designed to be activated automatically, leading to code execution. The document body is heavily obfuscated and does not provide clear user-facing content, but the critical heuristics point to a known exploit vector.

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_off00157cc7.bin
591faf397094ff3a35e5da1d774e6a044b53c52a8b247593830c68fff284985d		 rtf-objdata-decoded RTF \objdata at offset 0x157CC7 3739 bytes

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