MALICIOUS
250
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1204.002 Malicious File
This XLSM file contains Excel 4.0 macros, indicated by multiple heuristic firings including 'OOXML_XLM_MACROSHEET' and 'OOXML_XLM_AUTOOPEN_DEFINEDNAME'. The macros utilize dangerous XLM formula APIs like FORMULA, GOTO, and HALT, which are commonly used to download and execute malicious payloads. The ClamAV detection 'Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0' further supports its role as a downloader.
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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.URL http://schemas.openxmlformats.org/spreadsheetml/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/excel/2006/main
- 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.xml5f4ba7159c1da7e493848f74e3669405dc7409a06e720ced64dc3eb8a5827a76 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml | 2902 bytes |
xlm_sheet_02.xmlf29a49c753318e85f442bed44c64f292c1b7fd6c5ed8b8668c3938c69145161e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml | 2297 bytes |
xlm_sheet_03.xml966a712c4f0f0d2f58ef2ea09ca169fd5d5278d9396ce226e09ea14a32d1074e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml | 1477 bytes |
xlm_sheet_04.xml84368b896055b80ba37112653973d9ab4ada45ec06389956e8791ed998edcdc5 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml | 1451 bytes |
xlm_sheet_05.xml68e2eada477a01dd45889d7781ac27297df589224a5824d7ff63a37df7f5bc75 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1476 bytes |
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