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

Static analysis result for SHA-256 704bec281fefdbd4…

MALICIOUS

Office (OLE) / .XLSX

1.15 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: eef29d1f4da931d2dedc293ceb773a81 SHA-1: b99ca17da434e7b3a5879c2e8b44adeedccb81e5 SHA-256: 704bec281fefdbd486f5fc253e6c011a045b632e022dfba7b8e1e0782dc53075
70 Risk Score

Malware Insights

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

The sample leverages the CVE-2017-0199 vulnerability, which is a known method for remote code execution. The embedded VBA macro, though seemingly empty of executable statements, likely serves to trigger the exploit. The primary IOC is the URL used to download the secondary payload, indicating a downloader or dropper functionality.

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://link.uebie.de/cHZmKc?&motorcar=judicious&keyboarding=hilarious&randomisation=obeisant&shop=wild&compute

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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