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

Static analysis result for SHA-256 b377cb39d6c6b90a…

MALICIOUS

Office (OLE) / .XLSX

280.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-09-22
MD5: deeac3fe7fbebb90483ee76db1e2bf17 SHA-1: b77bb5abf1aa44778fa7038f3af467d968cc61ae SHA-256: b377cb39d6c6b90ae6a7942c9c80992e636c5607b28b9e704fc77a5d68acc17c
122 Risk Score

Malware Insights

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

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 embedded URL 'https://deluciaspizza.com/netmouser.dll' is likely used to download a secondary payload.

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

Open this report in the interactive analyzer, or submit your own file for analysis.