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

Static analysis result for SHA-256 00791322ee703d70…

MALICIOUS

Office (OLE) / .EXE

43.0 KB Created: 1980-01-04 13:50:03 Authoring application: Microsoft Excel
MD5: f300689ac2a347e88f4581dfefbcd526 SHA-1: 33058e7093195870552a722306fae1f1f7d115a5 SHA-256: 00791322ee703d70eff516d567e0f47ef79181662d42d7c01cd3ddb4ca8a6181
180 Risk Score

Malware Insights

MITRE ATT&CK
T1547.001 Registry Run Keys / Startup Folder T1547 Boot or Logon Autostart Execution T1059.005 Visual Basic

The file is identified as a variant of the Laroux macro virus, a known threat. The VBA script within the file, specifically the 'auto_open' subroutine, is designed to execute automatically when the workbook is opened. It attempts to save a copy of itself as 'SIEMENS.XLS' in the Excel startup path, indicating a persistence mechanism. The script also schedules further execution of a routine named 'MassageVirus' at various times.

Heuristics 4

  • Excel 5 Laroux/Larou-CV macro-virus marker cluster critical OLE_XLS5_LAROUX_MACRO_VIRUS
    Legacy Excel workbook contains a Laroux/Larou-CV macro-virus marker cluster including auto_open execution and workbook/module replication strings. This is a narrow indicator for an infected legacy Excel macro workbook.
  • ClamAV: Xls.Trojan.Laroux-33 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-33
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9afdef5d3f58a3bfb87200ecfd8c58ec2c397f21e74cf9e1c782c93e73dfb137		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3704 bytes

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