Office (OLE) / .XLSX malware analysis — malicious · b24b80b2205a2fdf

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 54c9af8d91c72e84200c712f403ef8ed SHA-1: f222ba1dc6339b6475d091aa5178c32b2b4c855e SHA-256: b24b80b2205a2fdf238b418319883f3a9c7435b5c7ba01032b0cf8a151f9f77e

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 sample is a macro-enabled Excel file detected as malicious by ClamAV. The Auto_Open macro attempts to establish persistence by copying itself to the Excel startup folder as 'mypersonel.xls' and setting an Auto_Open macro. The Auto_Close macro 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` `0e027d7c75d49f79cc7aa4389acfebf7b55f41d2ad86258589318b07847f19ae`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1816 bytes

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