MALICIOUS
250
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
T1059.001 PowerShell
T1105 Ingress Tool Transfer
The file contains Excel 4.0 macros, specifically using the dangerous FORMULA API, which is a strong indicator of malicious intent. The macros are designed to download and execute a payload from one of the provided URLs. The ClamAV detection as 'Xls.Downloader.EmotetRed022215-9938912-0' further supports this, as Emotet is known for its downloader capabilities. The reconstructed URLs and the use of rundll32.exe to execute a DLL indicate a clear download and execution chain.
Heuristics 6
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Excel 4.0 macro sheet (7 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.EmotetRed022215-9938912-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.EmotetRed022215-9938912-0
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Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 9 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 7
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xml845190ff95687dd3bed60f8155a4703d187c9ac3d57c95b5f1e5fbccfcda8bf1 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3818 bytes |
xlm_sheet_01.xmleb8dc692c1dd2153c89791e81ba8dde6872cd513333852aece5cf5246e9e9be7 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1339 bytes |
xlm_sheet_02.xmla2c24226987a123df54bf20bea623cddda5aa0848671b3a68fae646b034b0c13 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 1334 bytes |
xlm_sheet_03.xml1afc49d1079b956e7cd6c79b3050d7c6146176d5f88b0641a059978149dc558f |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.xml | 1337 bytes |
xlm_sheet_04.xmlf2beecaf3836e6877dc1d8dcccc0ec6a61ee971bb99fad7ea199d9c4485833ad |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.xml | 1341 bytes |
xlm_sheet_05.xml33833c2bb127cd3da704c0fa39beca9ede4ef247ba80706d40a7c8cb5fdddbee |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet5.xml | 1256 bytes |
xlm_sheet_06.xml9600e9bf835b635afc1c3dbd6b85e16bd1c645dbab403a3c6d8610cff36b8262 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet6.xml | 1177 bytes |
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