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

Static analysis result for SHA-256 f51480c02c36d0bb…

MALICIOUS

Office (OLE) / .XLS

550.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 755b149810e5842b3b8669fdadca8af0 SHA-1: 1ea35cf2e9de3968c9a7bb1df42aae93ba9f0aaf SHA-256: f51480c02c36d0bb95f7f31b8486f8956881ee900c9700d22b297af5ce975cc1
70 Risk Score

Malware Insights

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

The critical heuristic firing indicates the exploitation of CVE-2017-0199, a known vulnerability for remote code execution. This is further supported by the embedded URL, https://jakos.ovh/v8ZK9t, which is likely the source of the secondary payload. The VBA macros, while not directly executable, are present within the document structure, consistent with macro-enabled malicious documents. The file's purpose is to leverage this vulnerability to download and execute arbitrary code from the specified URL.

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://jakos.ovh/v8ZK9t

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