MALICIOUS
290
Risk Score
Malware Insights
MITRE ATT&CK
T1218.010 System Binary Proxy Execution: Regsvr32
T1059.005 Command and Scripting Interpreter: Visual Basic
T1105 Ingress Tool Transfer
This XLSM file contains Excel 4.0 macros that leverage dangerous API functions like FORMULA to download payloads from multiple URLs. The macros are designed to execute these downloaded payloads using regsvr32.exe, as indicated by the 'SE_LOLBIN_RUN_COMMAND' heuristic and the reconstructed command line in the DOC BODY. The ClamAV detection name 'Xls.Downloader.Emotet02220-9940466-0' strongly suggests the Emotet family.
Heuristics 7
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Excel 4.0 macro sheet (3 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.Emotet02220-9940466-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.Emotet02220-9940466-0
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LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMANDExtracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 5 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://swslawfirm.com/bkp-old-site/DBKqTw9HFJ6/
- http://thoughtwiseevents.astravit.com/wp-admin/nbXBflpB31RX1O/
- https://liberalpartyofindia.org/cgi-bin/cPH1jR/
- https://simulateur.olsenandg.com/macd-10gbe/55vS6Mo8YYii/
- https://carretilha.net/whats/qZ7jacauUIqEBtnUm/
- http://swslawfirm.com/bkp-old-site/DBKqTw9HFJ6
- 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
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xml5a73116e27eb06fa6e8d60d4b344e102573429cf6874bb0fdd8cb0994c5f6026 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3184 bytes |
xlm_sheet_01.xml7caed1eae5b0f3e915029fa67cb3873d25ce916a4d0ada0fb30ee607f699a498 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 834 bytes |
xlm_sheet_02.xml3df8ec18847008a0b2c759d2a209eec837168e46a82f4fab57c3173f436ed8e7 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 857 bytes |
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