Office (OLE) / .XLSX malware analysis — malicious · a815d79fa968200f

MALICIOUS

Office (OLE) / .XLSX

1.11 MB Created: 2010-12-03 10:23:08 Authoring application: Microsoft Excel First seen: 2023-02-20

MD5: a9631063734ae0d14fc389d1d86ac468 SHA-1: efe3b8fbc3af7e6d94f47b53b0c89910d6a55bf9 SHA-256: a815d79fa968200f669b62232b92827f5ed1f57d56576e596f2f572fa5ce7670

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel macro-enabled document that attempts to disguise itself as payroll or employee information. It contains Auto_Open and Auto_Close macros designed to establish persistence by saving a copy of itself to the XLSTART folder as 'mypersonnel.xls'. The Auto_Open macro also attempts to save a copy as 'mypersonel.xls' in the XLSTART folder, which is a common technique for malware to ensure it runs when Excel starts.

Heuristics 5

Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPEN

Workbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
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` `b23937ae9ca97e9210d5c6071d03ed3de76a7817fd73e0bc54f9039570b1703e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1819 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.