Emotet Office (OLE) / .XLS malware analysis — malicious · ab4456f73cd0d49b

MALICIOUS

Office (OLE) / .XLS

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

MD5: 5eac124a77133f3fd6ab6a9ae8d06331 SHA-1: c7bde6d20c193fc30813c3641ec12f61b49e0cfc SHA-256: ab4456f73cd0d49bd6c2dc5553a33ff128bc765cb07cd47f8e0619d01735f966

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The file is identified as malicious by ClamAV with the signature Doc.Downloader.EmotetExcel01220-9937164-0, strongly suggesting the Emotet family. Critical heuristics indicate the presence of an Excel 4.0 macro sheet with an Auto_Open defined name, which is a common delivery mechanism for Emotet. This macro sheet is designed to execute malicious code automatically when the workbook is opened, 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.EmotetExcel01220-9937164-0 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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