MALICIOUS
250
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1204.002 Malicious File
T1059.001 PowerShell
This XLSM file contains Excel 4.0 macros, including the Auto_Open function, which is a common technique for executing malicious code upon opening. The macros utilize dangerous XLM formula APIs like FORMULA, GOTO, and HALT, which can be used to download and execute arbitrary code. ClamAV detection confirms this as a downloader variant of IcedID. No specific URLs or hashes were extracted, but the technique strongly suggests a downloader.
Heuristics 6
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Excel 4.0 macro sheet (10 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 10 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 10
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xml0fea66c14a758f69219c2a291a7867fd7bdf005a68b88ac63d9198f174ca9e25 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3274 bytes |
xlm_sheet_01.xmledd56ce6c1aaebd6a961f4f3e21381f159f4e4a5cb9588dee71059686a23fd36 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml | 1813 bytes |
xlm_sheet_02.xml0bf73014734044b1be473cf60f0bc0956400786157951f1eafa33463db204467 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml | 2221 bytes |
xlm_sheet_03.xml1689f80fcd8d29bbe3f6826c85a4540f840aaca57f1dab7118361be453f9c62f |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml | 1457 bytes |
xlm_sheet_04.xml592faf795ef32e9abd34df5439e415f27d5e1c3900f372036296e9849f1da2dc |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml | 1523 bytes |
xlm_sheet_05.xml21036e671bd96742131b768b836f683650b1b62627606efe875f8c786e301918 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml | 1461 bytes |
xlm_sheet_06.xml8d2ada19e3ea28284efe269aede03d58a72dd70f04cc971c83273e788cc6af87 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml | 1457 bytes |
xlm_sheet_07.xml938cc835b7ab4aa3dea37f0e63091f7a34f0b4608d7bd063ec89076fac32ce5c |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml | 1458 bytes |
xlm_sheet_08.xml3394a1195cc4e485811eb02b87115bd3b5f3f1bfb26f05d95729273c23b5e0a9 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml | 1448 bytes |
xlm_sheet_09.xml3afe788cc0d6b7fdc8627509b129d19739d24c6d621de96f23bc3e25a44fa05e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1374 bytes |
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