Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1e4ad02011243a4d…

MALICIOUS

RTF / .DOC

1.05 MB Created: 2019-09-17 13:59:00
MD5: 39b3509fb9c6360f963bb1f77b4fdb90 SHA-1: da7265cfbe704da87c707ea4e9086fd87a644071 SHA-256: 1e4ad02011243a4da0ef7bea0851ea84e7cd9d69fd6f9a8a2d7e8fb417362135
200 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor, specifically targeting CVE-2017-8759. This vulnerability allows for the activation of OLE objects, leading to arbitrary code execution. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, RTF_OBJUPDATE, and CVE_2017_8759 heuristics strongly indicates exploitation of this vulnerability. The embedded URL, while benign, is part of 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_off000f98e4.bin
8f4f6f8ca6b7b89caac9272dedb134408571dbc45eed84f0a06fc2b539cfd62f		 rtf-objdata-decoded RTF \objdata at offset 0xF98E4 3732 bytes

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