Emotet Office (OLE) / .XLSX malware analysis — malicious · 4f48ef3036b8e2b7

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 8912774c64eec4c04030bba5e50c4300 SHA-1: 6c2d1312e639d22785adb3b9bdc2bb0e3e60aa47 SHA-256: 4f48ef3036b8e2b724cbf9ec618f35baf7cb5e2017dc5fae4825659a28b58e68

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, a known technique for executing malicious code. ClamAV detection further confirms this as Emotet, a downloader family. The document body content appears to be a lure, masking the malicious macro execution.

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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