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

Static analysis result for SHA-256 55f799464d646ffc…

MALICIOUS

Office (OLE) / .XLSX

445.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2024-08-16
MD5: 297b644a84efbefc85d3c95988bddb5b SHA-1: 58cb4b060a79f2b734a7d5f62da3d4917972a78f SHA-256: 55f799464d646ffc4c80a1efb60881864ada0b82b4def02784b35c63868e09bb
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing indicates exploitation of CVE-2017-0199 via an OLE2Link object, which is designed to download and execute a remote payload from the URL https://jio.cx/AvLETi. Although the VBA macros themselves contain no executable statements, the presence of the exploit and the embedded URL strongly suggest a malicious downloader. The file is an Excel spreadsheet, which is a common delivery mechanism for such exploits.

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://jio.cx/AvLETi

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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