Office (OLE) / .XLSX malware analysis — malicious · 1b435df6c16c0b2e

MALICIOUS

Office (OLE) / .XLSX

604.0 KB Created: 2015-03-17 06:43:26 Authoring application: Microsoft Excel First seen: 2023-02-06

MD5: c87169b76d0b5cf331b68f60ccc92ce9 SHA-1: e68c9610b27435f498adbc6ded6fa8020e26d59c SHA-256: 1b435df6c16c0b2ec27051322b2c486f4d7e3a260ef4af8f6cca3952fcbddfc8

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 sample contains VBA macros, specifically an Auto_Open macro, which is designed to save a copy of itself to the Excel startup directory (XLSTART) as 'mypersonel.xls'. This action establishes persistence by ensuring the macro runs every time Excel is opened. The Auto_Close macro attempts to convert the file to an older .xls format and delete the original .xlsx. 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` `d49b3eed57ea333340314eacd5bf3454f6a2ba3085f3bfa723034dd1a2d97cfb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1510 bytes

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