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, which is a strong indicator of malicious intent. The macros utilize dangerous functions like FORMULA and EXEC to download a file (putty.exe) from multiple URLs and register it as a DLL. This behavior is consistent with the IcedID malware family, which often uses macro-enabled documents for initial infection. The use of Excel 4.0 macros for payload execution is a critical finding.
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.xml3f9fc26faee1fe2d53aa6daf1011ebfcb0d93371a34e8b41917db9624d635598 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml | 3385 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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