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

Static analysis result for SHA-256 6554bb875518a3f9…

MALICIOUS

Office (OLE) / .XLSX

280.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 9646c9d32cec09ab37b67d393aaa6312 SHA-1: c4f45533795bcd7e3a1e7a28f3700b826356c981 SHA-256: 6554bb875518a3f98aca2f086217a5fc86778c3e90132f4e1f0fec6000ba3103
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. It also includes a lure to enable macros, impersonating a document signing service. The macros likely download a payload from the embedded URL 'https://deluciaspizza.com/netmouser.dll'.

Heuristics 5

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://deluciaspizza.com/netmouser.dll
    • https://deluciaspizza.com/netmouser.dll�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
03a736a0441cca1361495ea21c52abc837e6ebd0ef51c6a527890ae98e2f6598		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3422 bytes

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