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

Static analysis result for SHA-256 171e19367bda54c5…

MALICIOUS

Office (OLE) / .EXE

61.5 KB Created: 1999-12-16 23:32:19 Authoring application: Microsoft Excel
MD5: 4b2c9eada319cbbe0eae768b90faf29b SHA-1: 08b52954eb86679986aaf56412cf5d263d7fd570 SHA-256: 171e19367bda54c5ef23be130eb7d66464ba9ed4061ec56e633c634a36f7a1d3
240 Risk Score

Malware Insights

Xls.Trojan.Laroux-28 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

This Excel file contains a VBA macro, specifically an Auto_Open subroutine, which is a common technique for executing malicious code upon opening the document. The macro attempts to save itself as 'PLDT.XLS' in the startup path, indicating an attempt to establish persistence. The presence of 'Laroux' markers and ClamAV detections strongly suggest it belongs to the Laroux family of malware.

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
19e37346b4d089f01f7e6763fdb731f3d3c581d663d5d11fdf108a81cb5c5d58		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2018 bytes
Detection
ClamAV: Xls.Trojan.Laroux-28
Obfuscation or payload: unlikely

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