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

Static analysis result for SHA-256 313a548ca1fcf346…

MALICIOUS

Office (OLE) / .XLSX

148.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-10-25
MD5: b3375834bc3128bf9749c022abead3f6 SHA-1: 7d78583d3e966fe174c0b251252fd4705c3e8f5d SHA-256: 313a548ca1fcf346e0b8b0bd09e6f6f3e1fc56fad6eade25118d19b92d462230
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 attempts to download a secondary payload from the provided URL. The VBA macros are present but do not contain executable statements, suggesting the exploit is triggered by the OLE object itself rather than macro execution. The embedded URL is the primary indicator of the malicious 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 http://141.98.6.91/2150/2/HTMLCacheCentos.dOC

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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