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

Static analysis result for SHA-256 d01d9b66eafe89da…

MALICIOUS

Office (OLE) / .XLSX

389.0 KB Created: 2019-03-20 01:58:26 Authoring application: Microsoft Excel First seen: 2023-09-07
MD5: 9cbc21a9ed6e1525332557904760e570 SHA-1: 21b529aebd90312dad00c4bb46744b602d7e6242 SHA-256: d01d9b66eafe89da8b1b3cb45b194dc7d770c55bcabfb752c13f2b835b864f05
220 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros, specifically triggering Auto_Open and Auto_Close events. The Auto_Open macro attempts to copy the workbook to the Excel startup folder as 'mypersonnel.xls' to achieve persistence. The Auto_Close macro attempts to convert the file to an older XLS format and delete the XLSX version. The presence of 'laroux' markers and the overall behavior strongly suggest a macro-based malware dropper.

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.Malware.ExcelSic-10004731-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.ExcelSic-10004731-1
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
0e027d7c75d49f79cc7aa4389acfebf7b55f41d2ad86258589318b07847f19ae		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1816 bytes

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