Office (OLE) / .XLSX malware analysis — malicious · 7bd39f350e38ac3b

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 7ca61457c514a8eb397d61cba816b0f0 SHA-1: c839d6f3fc7be9fe0b68819b1aae1752bdaac51d SHA-256: 7bd39f350e38ac3bb9a768659bb5e85de32f3dc5ca4ca61125f2a874b00cd4de

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains VBA macros, including Auto_Open and Auto_Close functions, which are commonly used for malicious purposes. The Auto_Open macro attempts to save a copy of the workbook to the Excel startup folder as 'mypersonnel.xls', indicating an attempt to establish persistence. The Auto_Close macro attempts to convert the file to an older .xls format and delete the .xlsx version. The presence of XLM macros further suggests malicious intent.

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

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