Emotet Office (OLE) / .XLS malware analysis — malicious · 9fef0e22935c3ac2

MALICIOUS

Office (OLE) / .XLS

71.2 KB Created: 2022-01-20 19:00:43 Authoring application: Microsoft Excel

MD5: c0e6f531fbf312ec005f0df8cc39e9e2 SHA-1: 481536ecd95779240362bd2ac2ab0921cdc24c4e SHA-256: 9fef0e22935c3ac29516d148a9e07a033d0568550918e4b2c59bb5a357c54a8e

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristic OLE_XLM_AUTOOPEN_DEFINEDNAME indicates the presence of an Excel 4.0 Auto_Open macro, which is a common technique for initial execution. ClamAV detection further confirms its malicious nature, identifying it as a downloader associated with the Emotet family. The macro sheet's Auto_Open entry is designed to run code automatically when the workbook is opened, facilitating the download of additional malicious components.

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.EmotetExcel01220-9937164-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9937164-0
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` `7f1f89a8b36a750dced08313a4e4f056192a6eac7194357c673dbbd2670a1a18`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4219 bytes

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