Office (OLE) / .XLSX malware analysis — malicious · 4554e0aa9b3aad1f

MALICIOUS

Office (OLE) / .XLSX

718.0 KB Created: 2011-11-16 01:40:05 Authoring application: Microsoft Excel First seen: 2023-02-06

MD5: df0fb45aa93dd372dfa2ae1770097833 SHA-1: 706617479afdcd5024adccad4ebe8501ac56debf SHA-256: 4554e0aa9b3aad1f639878ee75979180ab75e440f22d2ba9f35b2db187d4d1a8

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 file contains VBA macros with Auto_Open and Auto_Close functions, indicating malicious intent. The Auto_Open macro attempts to save a copy of the workbook as 'mypersonnel.xls' to the application's startup path, establishing persistence. The Auto_Close macro attempts to convert the file to an older XLS format and delete the XLSX version.

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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