Emotet Office (OLE) / .XLSX malware analysis — malicious · 40dd74fb1fba5598

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 6bc0b98683ab73b9b80a2393bfd1fe2b SHA-1: 0587d2d7d5a63ec62d7f79c144bbce0e1c8339d2 SHA-256: 40dd74fb1fba55980387dff7f457cfee8778be09fd503bc397f747bd97d82ffc

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel01220-9936774-0', strongly suggesting the Emotet family. Critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common execution vector for Emotet. The macro sheet itself contains references to sheet names like 'Blood Pressure Data', which is likely a lure to encourage the user to open the malicious workbook.

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

Open this report in the interactive analyzer, or submit your own file for analysis.