Xls.Trojan.Laroux-29 — Office (OLE) / .EXE malware analysis

Static analysis result for SHA-256 82d9a470f3a6d064…

MALICIOUS

Office (OLE) / .EXE

51.5 KB Created: 1980-01-04 07:33:52 Authoring application: Microsoft Excel
MD5: d416aae7244e50f0732fc551a9fcc311 SHA-1: f7ce6affd3e8aeb15c64a43a5143b5c56e893ffa SHA-256: 82d9a470f3a6d064645fce52681f7dfb54c24beb955b860ff54e61462218d71d
240 Risk Score

Malware Insights

Xls.Trojan.Laroux-29 · confidence 95%

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

The file is identified as a malicious Excel 5 macro-virus, specifically the Laroux family, by multiple critical heuristics. The Auto_Open macro is configured to execute the 'big_dork' subroutine upon opening, which is designed to copy the 'WENDY' sheet and save it as 'SING.XLS' in the startup path, indicating a payload delivery or persistence mechanism.

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-29 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-29
  • 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
25dbe618edbc185c9fe6af3403f14ac95678e5cb2dc9338f503ffc5e5e2691be		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1829 bytes
Detection
ClamAV: Xls.Trojan.Laroux-29
Obfuscation or payload: unlikely

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