Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 987078b7fcba971f…

MALICIOUS

RTF / .DOC

713.0 KB Created: 2019-09-17 13:59:00
MD5: 37214a2958f10fcbf79be6599d83078c SHA-1: c41ed72b34a3cbfee38acdeb373c00e7084f8a41 SHA-256: 987078b7fcba971f1326035174a1e2f311c35bf4df47cc0a75f9e38505498b55
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link/Object: Malicious Link T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204 User Execution

The critical heuristics RTF_EQUATION_EDITOR and CVE_2017_8759 indicate exploitation of the Equation Editor vulnerability (CVE-2017-8759). The RTF_OBJDATA and RTF_OBJUPDATE heuristics suggest the embedding and activation of an OLE object, which is a common method for delivering exploits. The presence of an embedded URL, though marked as benign, is often part of the initial lure or part of the exploit chain. The overall pattern points to a document-based exploit designed to download and execute a secondary payload.

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_off000a03e5.bin
852e40cadcacbe01f6ee58b0bf074cb606656a40328df3fac513ac9cde77b5cd		 rtf-objdata-decoded RTF \objdata at offset 0xA03E5 3732 bytes

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