Xls.Trojan.Laroux-28 — Office (OLE) / .EXE malware analysis

Static analysis result for SHA-256 7e6b5a800396c9e2…

MALICIOUS

Office (OLE) / .EXE

28.5 KB Created: 1999-09-08 05:49:21 Authoring application: Microsoft Excel
MD5: dd1baa2eb5a57c1c66ff816941faf36b SHA-1: 2d6990879fc7dda54a9c41e885c40c78dbd1c263 SHA-256: 7e6b5a800396c9e2965bc21ced20b7e41a6da287168b13bccc349101cbba4f04
240 Risk Score

Malware Insights

Xls.Trojan.Laroux-28 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as a malicious Excel 5.0 macro-virus, specifically Xls.Trojan.Laroux-28. The VBA macro 'auto_open' sets up an 'OnSheetActivate' event to trigger the 'check_files' subroutine. This subroutine appears to be designed to save a copy of itself as 'PLDT.XLS' in the startup path, likely to establish persistence and facilitate further execution.

Heuristics 5

  • 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-28 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-28
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
ee1992067d04d849fc9a7e72d042dcbae9a96b6e56769fb6a4f66d8d717cc1c1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3063 bytes
Detection
ClamAV: Xls.Trojan.Laroux-28
Obfuscation or payload: unlikely

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