Emotet Office (OOXML) / .XLSX malware analysis — malicious · 00f0455df7ce95e8

MALICIOUS

Office (OOXML) / .XLSX

265.1 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-23

MD5: e86f3ae4f55385793563c148e3babac9 SHA-1: ae4dcbd4e2c44175454f42c1c2458ddc64327b1b SHA-256: 00f0455df7ce95e8e99756877724bfb6a056bf9cc2685535c1d7ee88cf7448cc

120 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file is an Excel spreadsheet containing Excel 4.0 macros, a known technique for delivering malware. ClamAV detection explicitly identifies it as an Emotet downloader. The macros are likely responsible for fetching and executing a further stage of the infection chain.

Heuristics 2

Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
ClamAV: Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `0739caeaa979fb9b94d312f443a973e7c53ed4452081346db704e2fcaccfba81`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin	1768 bytes

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