MALICIOUS
250
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
T1105 Ingress Tool Transfer
The file is an XLSM document containing Excel 4.0 macros, which is a common delivery mechanism for Emotet. The macros utilize dangerous functions like FORMULA to download a second-stage payload, specifically 'besta.ocx', from multiple URLs. The ClamAV detection also explicitly names this as an Emotet variant.
Heuristics 6
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Excel 4.0 macro sheet (8 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.
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Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAMEWorkbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
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Dangerous XLM formula APIs: FORMULA critical OOXML_XLM_DANGEROUS_FNExcel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
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ClamAV: Xls.Downloader.EmotetExcel122100-9913103-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.EmotetExcel122100-9913103-0
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Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 11 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.microsoft.com/office/excel/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6
Extracted artifacts 8
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xml7e43fd3a34b9a01e861dfe456c68f67abfb2b8f42dd37b661b6a0dfb8c8fb495 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3257 bytes |
xlm_sheet_01.xmlceb5adcada0214181e536a8a058cb456fbcfe4a486d29cd185c8117200520be1 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1365 bytes |
xlm_sheet_02.xml8a64aa30d99902ea7a99a9b90b1ee1238a58df11dd8419d899ea7dd6d334096d |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 1366 bytes |
xlm_sheet_03.xmleb9bfe9bdebda540c828894dc4e9149e1ba7a2691d1ed56b3b04fb6d9a36191e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.xml | 1363 bytes |
xlm_sheet_04.xml2758b4ba64fea766c088d247a1498ea08c026fe41c5c21d48ad4f0f8b7be5e57 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.xml | 1363 bytes |
xlm_sheet_05.xml6451df65cc10e1503db4d453a64f73a9026417657722c57f6ed147c8ec6708ac |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet5.xml | 1366 bytes |
xlm_sheet_06.xmlbaa175c596711727ab65048b590e8e52a70cdec06148a9d046c2a6286ecdf57f |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet6.xml | 1365 bytes |
xlm_sheet_07.xmle72f152fc995eb1f1ad88257e6ba1c18f0602a7fbede21eb23a670a9c64dfe55 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet7.xml | 1365 bytes |
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