Emotet Office (OLE) / .XLSX malware analysis — malicious · bcfa7cbaded9c614

MALICIOUS

Office (OLE) / .XLSX

142.6 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel

MD5: db6e6aeb476e4e4ca21699fc9b0c6053 SHA-1: a702a5f3e72b564be112a6bd0bf5b3dd7cfbd779 SHA-256: bcfa7cbaded9c6144689692a9ea193431c16e7bf18e7ab361ef65fce375d93be

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1566.002 Spearphishing with Malicious Attachment

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel01220-9936774-0', indicating it's a known Emotet downloader variant. Heuristics confirm the presence of Excel 4.0 macros, specifically an 'Auto_Open' defined name, which is a common execution vector for this family. The macro sheet itself is likely responsible for downloading and executing 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.EmotetExcel01220-9936774-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9936774-0
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` `592af8991900f2f7058dc7ea90a33320ae293c7e541db4222a7b7f9c04f59d96`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8469 bytes

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