Emotet Office (OLE) / .XLS malware analysis — malicious · 000cc33e07a54efd

MALICIOUS

Office (OLE) / .XLS

142.3 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel First seen: 2022-04-01

MD5: cce2ae6faa57a49a06207d756e2f4cde SHA-1: 2096444c7e95cd69b62747a656fc192755683a6f SHA-256: 000cc33e07a54efdd93292b770d056894faa9a41eb9c1c22bf1507365a35ed64

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, a common technique for Emotet. ClamAV also detected this file as Doc.Downloader.EmotetExcel01220. The document body contains seemingly benign blood pressure tracking data, which serves as a lure to disguise the malicious macro functionality. The Auto_Open macro is designed to execute automatically upon opening the spreadsheet, likely to download and execute a secondary payload.

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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