MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The file is identified as malicious by ClamAV with the signature Xls.Downloader.Qbot02221-9940029-0, indicating a Qbot downloader. The presence of multiple Excel 4.0 macro sheets (XLM) within an XLSX file strongly suggests the execution of embedded macros. These macros are likely responsible for downloading and executing a secondary payload, a common characteristic of Qbot droppers.
Heuristics 3
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Excel 4.0 macro sheet (13 sheet(s)) critical OOXML_XLM_MACROSHEETSpreadsheet 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.
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XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSXOOXML package is named .xlsx but contains XLSB workbook parts and an international Excel 4.0 macro sheet. This hides XLM macro execution from scanners that trust the extension or only inspect XML worksheet parts. The technique is macro execution, not a document-parser CVE.
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ClamAV: Xls.Downloader.Qbot02221-9940029-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.Qbot02221-9940029-0
Extracted artifacts 13
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin71394a07c8189acff427ae8f8da7fd128d160657a1b7a6707b56f30c6085ff28 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 363 bytes |
xlm_sheet_01.bin50bc43abd185a42927ee43adbd4b8db25d62f4741404108aa88f7c8c2fb4181b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 776 bytes |
xlm_sheet_02.bin1d87a8d2a1c3c03f399306f7271fd6b79ef5683605e563ee2e22b3c33b492a7d |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 2617 bytes |
xlm_sheet_03.bin3163d9a0fb2cd84dd8785906b739f6733195016c6344c4376d479af298ceff5d |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 1739 bytes |
xlm_sheet_04.bin515506eab35eb6fe717bab19d56ebc46d8d16801cdf7381e3f492be93d7b08a7 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin | 673 bytes |
xlm_sheet_05.binea32a04f4cec6a4b499fc6dd2677e84a55746af8b3d6a511ea9f1bf7f59edcb9 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin | 707 bytes |
xlm_sheet_06.bine40dfef507602c0f11d9e7858b44b3034d00163d0da55e09861950fe07e098cc |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin | 826 bytes |
xlm_sheet_07.bin8ff569252732a19a0c2bed07c5ad0f50b228927f44f7dfa7f2828b85d007d2e6 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin | 552 bytes |
xlm_sheet_08.bin936cf5e026c8c314e7c5a6d141513f7e98659c44c66c1d6b538a1aa6031abdfa |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin | 483 bytes |
xlm_sheet_09.bin073c33eedb273d3d3d280714599b3a8f099a666fbd0b6610dd56f0ae7ff2a0e5 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.bin | 875 bytes |
xlm_sheet_10.bin702b4ecbc014db115a35b4adb60f78da78d2e63fe882e7dc411859f9926c6af6 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.bin | 808 bytes |
xlm_sheet_11.bin01b738df69558832e27370208f44fc8d57a66dc63f4aa5465b347aa8572f0680 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.bin | 859 bytes |
xlm_sheet_12.bin61533168a82ce0e3a71d1dcbd2d66d47565459acbeb07b5e69e04d6d2b3cddff |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.bin | 679 bytes |
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