Office (OLE) / .XLS malware analysis — malicious · 63f044a0643cc8c6

MALICIOUS

Office (OLE) / .XLS

61.5 KB Created: 2020-08-23 14:59:56 First seen: 2022-04-02

MD5: fa0b15330c8ea15cf0f2d70927bf9e9c SHA-1: ad9bbac1d9bbe7a953ffc70e5dbbaeca9004ba58 SHA-256: 63f044a0643cc8c69550bfe15954b38d66786e4b5be97d532a980aa5add58824

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing VBA macros, specifically an Auto_Open macro designed to execute upon opening. The macro attempts to establish persistence by copying itself to the Excel startup folder as 'mypersonnel.xls' and also attempts to save a copy as 'mypersonel.xls' in the XLSTART directory. The Auto_Close macro also contains logic to save the workbook, potentially to obfuscate its presence or format. The document body appears to be a benign school timetable, suggesting a lure.

Heuristics 4

ClamAV: Xls.Malware.ExcelSic-10005885-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.ExcelSic-10005885-1
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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