Office (OLE) / .XLSX malware analysis — malicious · 52fe31d1d0c2afd2

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 1a6691ee62136a08283ee5457a17b277 SHA-1: 9aa34375cd6f787cbc2d1da006a8ac9484469725 SHA-256: 52fe31d1d0c2afd262fc5e0721d4ffdcfb9a6e81337fd75ac96912fb274c801c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The file is an Excel spreadsheet containing VBA macros, including Auto_Open and Auto_Close functions, which are commonly used to execute malicious code upon opening or closing the document. The Auto_Open macro attempts to save a copy of itself as 'mypersonnel.xls' into the Excel startup directory, indicating an attempt to establish persistence and likely download further payloads. 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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