Office (OLE) / .XLSX malware analysis — malicious · 90546040a0ef9752

MALICIOUS

Office (OLE) / .XLSX

43.5 KB Created: 2023-02-15 06:13:36 Authoring application: Microsoft Excel First seen: 2023-02-20

MD5: 293ed05fc343bf56fabf8204b2c3b0d3 SHA-1: 545e534ddf089fa7fd6bb1f7c02da6ae835018e9 SHA-256: 90546040a0ef975265aa36c325681f9ae262de2a2726cb6919916cd8423000de

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a macro-enabled Excel spreadsheet that contains Auto_Open and Auto_Close VBA macros. The Auto_Open macro attempts to establish persistence by copying itself to the Excel startup folder as 'mypersonnel.xls'. The Auto_Close macro attempts to convert the current workbook to an older .xls format and delete the .xlsx version. The ClamAV detection further confirms its malicious nature.

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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