Emotet Office (OLE) / .XLSX malware analysis — malicious · c3782f393e6dca8c

MALICIOUS

Office (OLE) / .XLSX

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

MD5: c006a39b1e78cdd816862fbc9d3612ae SHA-1: bd24c289bb13d4f83e1c7c9bba8fb2143c483c31 SHA-256: c3782f393e6dca8cbded5a7bbb73789792cd1bf807f4f71cd863b12992beda95

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The critical heuristics indicate the presence of Excel 4.0 macros, specifically an Auto_Open defined name, which is a common technique for Emotet. ClamAV also explicitly identifies the file as 'Doc.Downloader.EmotetExcel01220-9937164-0'. The extracted macro sheet information confirms the presence of an Auto_Open entry, suggesting the macro executes automatically upon opening the document. This macro is likely designed to download and execute a second-stage 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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