MALICIOUS
250
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
T1105 Ingress Tool Transfer
This Excel macro-enabled workbook (XLSM) utilizes Excel 4.0 macros, specifically leveraging dangerous functions like FORMULA, GOTO, and HALT. These functions are used to call Win32 APIs such as URLDownloadToFileA and DllRegisterServer to download and execute a payload, identified as putty.exe, from multiple IP addresses. The presence of these functions and the download mechanism strongly indicate a downloader functionality.
Heuristics 6
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Excel 4.0 macro sheet (6 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, GOTO, HALT 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.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
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Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 6 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 6
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xmle26278d9df62929caddc39c2675d1a93c805965a35896b4c4240468b728373e2 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 1190 bytes |
xlm_sheet_01.xml085a8a039cb8c91691ce44c2a10342e69aadd8dff46f2810d70b152b307685e2 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml | 3114 bytes |
xlm_sheet_02.xml32e86c8d875e3bc28a2fb3c0512d0cffa7c2a81da63e4fe594ba2772a3b3768c |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml | 2364 bytes |
xlm_sheet_03.xmlf6023b616a33da16850bd04bca335ab61b8bf9717cbe0a8ef91527cea67ae7fd |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml | 2025 bytes |
xlm_sheet_04.xmld60ca3a864e3f818e7a00f9aa3f6fdbc180e13ef9ef26c0d3de35bf633fcfa97 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml | 1560 bytes |
xlm_sheet_05.xmle39ad03223dbd59846bfcaeec79c94a8bcc60e0526ca5f2965b6b33923361cfa |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1831 bytes |
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