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

Static analysis result for SHA-256 2672783b07d4a032…

MALICIOUS

Office (OLE) / .XLSX

220.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-10-22
MD5: 15c921cb2dac8d0ee2ca4fbe7f7c0989 SHA-1: 18bbe85e71bc15b10da55f70796ac86bd75936d9 SHA-256: 2672783b07d4a03225cd11b484092db5792617647ba2f3ac4b447e22a9d0ed16
62 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an OLE file that triggers the CVE-2017-0199 vulnerability. This vulnerability allows the file to act as a remote loader, fetching and executing a secondary payload from the embedded URL http://94.156.253.236/HTMLcvdesiii.dOC. The file's structure and the specific heuristic firing strongly indicate its use as a downloader for further malicious activity.

Heuristics 2

  • 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.
  • 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://94.156.253.236/HTMLcvdesiii.dOC