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

Static analysis result for SHA-256 6f93c184eb7bccf2…

MALICIOUS

Office (OLE) / .XLS

1.25 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4b6db164db2aa44d48b2b148286069f5 SHA-1: d15e4df6c34e059d29c5eda5b6342ac14326dcec SHA-256: 6f93c184eb7bccf237fb04fe4b9b47fbb4b8bd5ad0a581b8d0e76879e47f5741
70 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is an Excel file that exploits CVE-2017-0199, a known vulnerability for remote code execution. The heuristic indicates it attempts to load a remote URL, which is further supported by the embedded URL found in the document. The VBA macro, while not containing executable statements directly, is part of the exploit chain. The primary IOC is the URL used for payload delivery.

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://kutt.ar-email.com.br/rQHArs?&deputy

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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