Emotet Office (OLE) / .XLS malware analysis — malicious · cbbeb47f7b0343ff

MALICIOUS

Office (OLE) / .XLS

108.1 KB Created: 2022-01-22 10:28:51 Authoring application: Microsoft Excel

MD5: 1b8b135a69edc69de90e9afa72a373d8 SHA-1: 675caa7c5ebe2d35daf76d4ce91e982f5381c97d SHA-256: cbbeb47f7b0343ffabb173ed0dbb38ae17477129c5dce9bf866814a4f42e3389

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, a common technique for initial execution. ClamAV specifically identifies the file as 'Xls.Downloader.Emotet', suggesting its purpose is to download further malicious content. The document body, a time card, serves as a lure to entice the user to open the malicious spreadsheet.

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: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0
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` `4282a66cb39a54151a7150b41c26dfb71d035cb8ac904f3e031d21c44da4ada6`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3523 bytes

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