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

Static analysis result for SHA-256 4d05d391297e3c4e…

MALICIOUS

Office (OLE) / .XLSX

280.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6f7f78fa1fbe9be8fbe20812658c43aa SHA-1: d3f78f528a797c2e97af9f25e189bc43d98f2eae SHA-256: 4d05d391297e3c4ec1bc4047bd3e104f37123c709797854053966ced43f492fb
120 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The document uses a lure to trick the user into enabling macros, impersonating a document signing service. The embedded URL points to a potential second-stage payload. No scripts were extracted, but the XLM macros likely facilitate the download and execution of this 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

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