Emotet Office (OLE) / .XLSX malware analysis — malicious · 2847438e4b48ee5f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: aa1f2dce468dd013ea7afbc1d3f205bf SHA-1: 50ecd71146b46cf2afb66fba3c957896c2f79d38 SHA-256: 2847438e4b48ee5f630b8d0a3d5361bf4071aa308d8999a69cba995fa548add5

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry, which is a common delivery mechanism for Emotet. ClamAV detection further confirms this, identifying the file as 'Doc.Downloader.EmotetExcel01220-9937164-0'. No specific script content was detailed, but the presence of Auto_Open strongly suggests the macro executes automatically to download and run 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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