Emotet Office (OLE) / .XLSX malware analysis — malicious · 22948141e8f020d0

MALICIOUS

Office (OLE) / .XLSX

141.9 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel

MD5: 30059262ec13cc306a468e21cdcb9d00 SHA-1: e4b2abc7e64e125254715adc0bac71a82e663798 SHA-256: 22948141e8f020d01dbd92abd0eeacb3eb1d69fcf145fee4b65cdc395d309a57

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel01220-9936774-0', indicating it's a downloader. The presence of Excel 4.0 macros, specifically an 'Auto_Open' defined name, confirms that the macro will execute automatically when the workbook is opened. This is a common delivery mechanism for Emotet, which typically downloads and executes additional malicious payloads.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
ClamAV: Doc.Downloader.EmotetExcel01220-9936774-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9936774-0
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `592af8991900f2f7058dc7ea90a33320ae293c7e541db4222a7b7f9c04f59d96`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8469 bytes

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