Emotet Office (OLE) / .XLSX malware analysis — malicious · 60c25a5867273c0d

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 08f1300f42c2939ef8a73a30b4b5d8e4 SHA-1: 82531a9464c76ccad2a047278f8d0dce8ff29e05 SHA-256: 60c25a5867273c0dd739df5c10f6807d4fbfeb7db9b8ffeb4aac58a2da169010

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a strong indicator of malicious intent. ClamAV detection as 'Doc.Downloader.EmotetExcel01220-9936774-0' further supports this. The presence of XLM macros suggests the file is designed to download and execute a secondary payload, a common Emotet tactic. The document body, 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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