Office (OLE) / .XLSX malware analysis — malicious · 865251134f7aa91a

MALICIOUS

Office (OLE) / .XLSX

53.0 KB Created: 2020-11-20 17:59:00 Authoring application: Microsoft Excel

MD5: 9b914ffb20240b7f5b03a8f8bbb4b937 SHA-1: 0f3a0f49345ea9fff7bb5519bf37704819add24c SHA-256: 865251134f7aa91ac0ba1d8320de0900d84758b5423ee22cb2d56f7a9866ee2c

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample contains both VBA and Excel 4.0 macros. The Auto_Open macro in the VBA script and the EXEC function in the XLM macro both construct and attempt to run a PowerShell command. This command is designed to download a file from 'https://tinyurl.com/y2ua6dah' and save it as 'co.exe' in the user's AppData directory, then execute it. This indicates a downloader or dropper functionality.

Heuristics 4

ClamAV: Xls.Malware.Abracadabra-10031695-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Abracadabra-10031695-0
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `d9651c84922a814fe441fde7c34a9c9c67ab621ba5cf68e85d12b6f9c79ebfbf`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1829 bytes
`macros.bas` `6d63cb86a5ee5dd02f48e36073c641f88f8f36c38152f861499967ac4cdc3005`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1069 bytes

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