Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b47b66a664575b48…

MALICIOUS

RTF / .DOC

960.9 KB Created: 2019-09-17 13:59:00
MD5: 59b6d7adab51a3a2e3bf00427e04faa8 SHA-1: c053ae8daf1d5a40f963a51784ade3b7479c820d SHA-256: b47b66a664575b48637c22b9feb0bca586b5628bd0f274c20909451fc91e344a
200 Risk Score

Malware Insights

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

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 document body is heavily obfuscated and does not provide clear textual lures, but the technical indicators point to a malicious exploit delivery.

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_off000e8d65.bin
1f0b48a617188dda9df5add24c00b31eb850a988e8d37443ccdc1cd79ad209ca		 rtf-objdata-decoded RTF \objdata at offset 0xE8D65 3739 bytes

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