Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e919dbb1794c9f47…

MALICIOUS

RTF / .DOC

1.54 MB Created: 2019-09-17 13:59:00
MD5: e287db04b1aa6f0eb255494bb1fd86a8 SHA-1: 2b5407c2deaa6837a2bc450e59e8dfd2984d90ef SHA-256: e919dbb1794c9f4715c12d238b69e3096d69f557e8d3c490db0c3d84faa604cc
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The file is an RTF document containing embedded OLE object data, specifically triggering critical heuristics for RTF_EQUATION_EDITOR and CVE_2017_8759. This indicates the document is designed to exploit a vulnerability in Microsoft Equation Editor to execute arbitrary code. The presence of objupdate suggests an attempt to force OLE activation. While no specific malware family is identified, the exploit mechanism is clear.

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_off001845d8.bin
72694e31ea707ff01607afc15a888b3c35d76920b39b831faa5fe967e0bd4d13		 rtf-objdata-decoded RTF \objdata at offset 0x1845D8 3739 bytes

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