Emotet Office (OLE) / .XLS malware analysis — malicious · 19b5d05f9484e4de

MALICIOUS

Office (OLE) / .XLS

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

MD5: 2a3866e51fd86156b596bc4ea89ad1a4 SHA-1: ba71e5c9364e5f0ec05d72a1233a91289eac21f1 SHA-256: 19b5d05f9484e4de6ee17525093f07e2da57287e05e5bcf9999f694bdab916f7

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 workbook containing an Auto_Open macro, a common technique for executing malicious code upon opening. ClamAV detection explicitly identifies it as an Emotet downloader. The presence of the Auto_Open macro indicates an attempt to bypass security controls and execute arbitrary code, likely to download a further stage.

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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