Emotet Office (OLE) / .XLSX malware analysis — malicious · 909664581c9c1270

MALICIOUS

Office (OLE) / .XLSX

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

MD5: b120db0c8d6171b0abc2532fb9c87afe SHA-1: a07b29b8245f026e53b18588dfa3f645f502ebfd SHA-256: 909664581c9c1270d91b217c94841e2f6035a12c5f15725c384b2fa746b0b3dd

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a strong indicator of Emotet activity. The ClamAV signature also explicitly identifies it as an Emotet downloader. The document body content appears to be a lure, disguised as a blood pressure tracker, to encourage users to open the malicious macro-enabled spreadsheet.

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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