Office (OLE) / .XLSX malware analysis — malicious · 515f5b1e6ff8a44a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 134d9003c05978f3192c8159c219be00 SHA-1: 709628edeebd4fa3604ef2a614ff375efdda534e SHA-256: 515f5b1e6ff8a44a06fa70ca3d0cd212516ec8bc0f029e3642fd2c7e303b9826

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains VBA macros, including an Auto_Open macro, which is a strong indicator of malicious intent. The script attempts to save a copy of itself to the Excel startup directory (XLSTART) as 'mypersonnel.xls', which is a persistence mechanism. 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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