Emotet Office (OLE) / .XLS malware analysis — malicious · 5c5a644377d6087d

MALICIOUS

Office (OLE) / .XLS

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

MD5: 99130b164c6d3c4fbb33d9d4588551b7 SHA-1: a3e9bbca528a24553d43ad72e4434ef58ca209b6 SHA-256: 5c5a644377d6087d2f2f42c7bd198db0c02e903ad833e0f003ed0050fe9e2ce9

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 spreadsheet containing an Auto_Open macro, a known technique for executing malicious code. ClamAV detection explicitly identifies it as an Emotet downloader. The presence of an Auto_Open entry indicates the macro will execute automatically when the workbook is opened, likely initiating the download and execution of 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.EmotetExcel01220-9937164-0 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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