Emotet Office (OLE) / .XLSX malware analysis — malicious · 670b10a706a22c6e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e82f4f6978c1cf7251b94c36ce40b8c1 SHA-1: b2c349fb3d27fa160a89174cf5fdb7e13a6d0bcf SHA-256: 670b10a706a22c6efc34af36bf591688d08eb44be993d5901a66525c6369bd9e

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains critical heuristics indicating the presence of Excel 4.0 macros with an Auto_Open entry, and ClamAV detection confirms it as a downloader associated with Emotet. The macro sheet is configured to execute automatically upon opening, a common technique for initiating malware delivery. The document body, while appearing as a blood pressure tracker, is likely a lure to disguise 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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