Xls.Trojan.Laroux-21 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 733a7d34e51983c0…

MALICIOUS

Office (OLE) / .XLS

20.5 KB Created: 1998-11-06 09:29:16 Authoring application: Microsoft Excel
MD5: b556e6b71c8de93bb4901e88793e85bb SHA-1: 37a0e39090f3c936e9acb0300e8c3cf4960567a8 SHA-256: 733a7d34e51983c0b3d2191dfea523951d9faa41e3d65aa0797a4913ec5db5b8
180 Risk Score

Malware Insights

Xls.Trojan.Laroux-21 · confidence 95%

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

This XLS file contains a VBA macro with an Auto_Open subroutine, which is a common technique for executing malicious code upon opening. The script attempts to save a copy of itself as 'jokefile.xls' in the Application.StartupPath, indicating an attempt at persistence. The ClamAV detection confirms this is a known malicious variant.

Heuristics 4

  • ClamAV: Xls.Trojan.Laroux-21 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-21
  • 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
f7fdbe7aaa1266e7b277238d79b60058042ecceafe9af92b551dd17daac31bbc		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1356 bytes
Detection
ClamAV: Xls.Trojan.Laroux-21
Obfuscation or payload: unlikely

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