Office (OLE) / .XLSX malware analysis — malicious · c6629c0785cebfab

MALICIOUS

Office (OLE) / .XLSX

196.0 KB Created: 2005-09-08 14:31:37 Authoring application: Microsoft Excel First seen: 2023-02-06

MD5: bfd1e67827fa8fb8506475049b38a878 SHA-1: db7cc6474a29e3e24c2b7627f9dcf8bb6496c13f SHA-256: c6629c0785cebfab9e0f8e5acdfe963ed517644a3be10a2f3014dc275e601d74

160 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 VBA macro code within the sample is designed to achieve persistence. Specifically, the Auto_Open subroutine saves a copy of the workbook to the Excel startup folder as 'mypersonnel.xls', ensuring it executes when Excel is launched. The Auto_Close subroutine attempts to convert the file to an older XLS format and delete the original XLSX.

Heuristics 4

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.

Filename	Kind	Source	Size
`macros.bas` `d49b3eed57ea333340314eacd5bf3454f6a2ba3085f3bfa723034dd1a2d97cfb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1510 bytes

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