MALICIOUS
290
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Service Execution
T1218.011 System Binary Proxy Execution: Rundll32
T1105 Ingress Tool Transfer
The sample is an Excel file containing multiple Excel 4.0 macro sheets, identified by the OOXML_XLM_MACROSHEET heuristic. The presence of dangerous XLM formula APIs like FORMULA, combined with the embedded URL 'http://tan4j.com/wp-content/eeKyqAfNAS0VWzH/' and the use of 'rundll32.exe', strongly indicates a downloader functionality. The ClamAV detection as 'Xls.Downloader.EmotetRed022215-9938912-0' further supports the Emotet family attribution. The macro code appears to be designed to download and execute a second-stage payload.
Heuristics 7
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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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LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMANDExtracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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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 https://esthetravel.com/762tv0z2/cache/S1r2qBwOXEnwkc7/
- 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.xml17a44bab46f03e771bd6542298156e3f6d09e434efc242a62b869dfb808c8fe0 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1339 bytes |
xlm_sheet_02.xmle0e53f2efa6401d85f42fc271b8a5f25f093236955ae9e2f8aff086ade287b72 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 1334 bytes |
xlm_sheet_03.xml99c0021f265b2512c81119e70583856c3b88d92cfcf4088dd76957bd454698ca |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.xml | 1337 bytes |
xlm_sheet_04.xml505da860283599ae30bb243e4b86ce81f7bcbf678c783ee47ffef058c21fdfa5 |
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.xml9db93655cb6fd9e30bf1d3ffbd4e22d858cd95d48236de02bbc820699d35abf8 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet6.xml | 1177 bytes |
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