Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 739b506e6bd7ecd9…

MALICIOUS

Office (OLE) / .XLSX

273.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 0f1d0fad61afc53c84373b79b762197d SHA-1: b63fdd36d81b30b1eb165dc07ae7ceb42aa5c6e0 SHA-256: 739b506e6bd7ecd9cfeb71456e19f2378173e13be0cde308c3e9dbb98b4d7ad6
70 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates exploitation of CVE-2017-0199, which is used to download and execute a remote payload from the URL https://lemon-kutt.lemon.cchan.tv/fIA3qq. Although VBA macros are present, they contain no executable statements, suggesting the exploit is directly leveraged by the OLE object. The file is an Excel spreadsheet, and the exploit facilitates remote code execution.

Heuristics 3

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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 https://lemon-kutt.lemon.cchan.tv/fIA3qq

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes

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