Office (OLE) / .XLSX malware analysis — malicious · 686217864e06b3ca

MALICIOUS

Office (OLE) / .XLSX

580.0 KB Created: 2015-03-17 06:43:26 Authoring application: Microsoft Excel First seen: 2023-02-06

MD5: cac2f46e87e50426d0ec029a5ae71d01 SHA-1: 21846017f7de61ee0396d985e543d0090d2a5e45 SHA-256: 686217864e06b3caed4e4f97cc35d1987541f34e3764d6b2b9defa61501caee1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1547.001 Registry Run Keys / Startup Folder T1059.005 Visual Basic

The sample contains VBA macros, including an Auto_Open subroutine, which is a common technique for executing malicious code upon opening an Excel file. The script attempts to save a copy of itself to the Excel startup directory (XLSTART) as 'mypersonel.xls' or 'mypersonnel.xls', thereby establishing persistence. The Auto_Close macro also attempts to convert the file to an older .xls format and delete the original .xlsx, further obfuscating its presence.

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` `0e027d7c75d49f79cc7aa4389acfebf7b55f41d2ad86258589318b07847f19ae`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1816 bytes

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