MALICIOUS
250
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The file is an XLSM document containing Excel 4.0 macros, identified by critical heuristics for macro sheets, Auto_Open defined names, and dangerous API calls like FORMULA. The macros construct URLs by concatenating strings, such as 'http://xxx247.nl/wp-admin/2fzDb1GGJC4EmhKc/', and use the FORMULA API to download and execute a second-stage payload, likely 'rundll32.exe ..\bestb.ocx'. This behavior is consistent with Emotet's known download and execution tactics.
Heuristics 6
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Excel 4.0 macro sheet (7 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.EmotetExcel01222-9935624-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.EmotetExcel01222-9935624-0
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Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 9 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 7
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xmlcc3c760d021dc0f92f6b8a31258dbda1f4fe62686d9454e8aea5f91fd5d5a51e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3001 bytes |
xlm_sheet_01.xml59fb56fc58fd232563a22867c20a884d6289f09f0c79869664f200eb18083ed9 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1276 bytes |
xlm_sheet_02.xml936d303af08b53433e824bd515ff133310f5cff0167aacad4837d6a70e0485aa |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 1276 bytes |
xlm_sheet_03.xml17855edc6796afbb0c6baab513b4cd688cd5290a5cd33c6df6d22bfd7956a7ee |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.xml | 1276 bytes |
xlm_sheet_04.xmle435c23f0c54e9a8e2c3c73f8190fa8ab2441a219c1eae2b9a9623cb899f7772 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.xml | 1273 bytes |
xlm_sheet_05.xml01e0b2a256cecd08e1d22b47d62d2bccf9e83a4249289bf05aa95a32228e2547 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet5.xml | 1275 bytes |
xlm_sheet_06.xml17e78319db707e4ee9281b0a633a93c66fe9a2780a5c2e1cecea51dd0c1a692e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet6.xml | 1276 bytes |
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