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

Static analysis result for SHA-256 059e15f99e30f57d…

MALICIOUS

Office (OLE) / .EXE

133.5 KB Created: 1999-02-08 09:24:15 Authoring application: Microsoft Excel
MD5: dce191c5b98bff2fa5fff1f4081643c7 SHA-1: d613f09d8b37e9b217587b1139f888aeba40233a SHA-256: 059e15f99e30f57d320c90e54f19a117783d509da5fbed71f9a73269df7507a8
240 Risk Score

Malware Insights

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

The file is identified as a malicious Excel 5 macro virus (Laroux-CV) by multiple critical heuristics. The VBA macro 'auto_open' sets up an 'OnSheetActivate' event to call 'check_files'. This script attempts to save a file named 'PLDT.XLS' into the application's startup path, which is a common technique for establishing persistence.

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
77ec1cd349d39ce1b243618eafdb3c4301980f009d274876c244bbba7c6afbb0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1859 bytes
Detection
ClamAV: Xls.Trojan.Laroux-28
Obfuscation or payload: unlikely

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