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

Static analysis result for SHA-256 ac5eb1618543365b…

MALICIOUS

Office (OLE) / .XLSX

261.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: daf2b1b562a007a93fbe00dee3ec93d3 SHA-1: eed18fda9a83a4d6bdc1d65ea29c6dc62dddaf5f SHA-256: ac5eb1618543365bfdbd27633949fc179424317db799d2ca55e39f0ef88fff44
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an Excel file containing Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN heuristic. It also contains a lure to enable macros, impersonating a signing service like DocuSign. The presence of an Auto_Open macro suggests that the file is designed to execute malicious code automatically upon opening. The reconstructed URL 'http://../sdbybsd.fds' is likely part of the payload delivery mechanism.

Heuristics 4

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
1cce783a487c585d0f0d553a6dcc92b7a1cc8611def516623538f51ccff16f05		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4427 bytes

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