MALICIOUS
290
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1218.011 System Binary Proxy Execution: Rundll32
The file contains critical Excel 4.0 macros that utilize dangerous API functions like FORMULA to download and execute payloads. The macros construct a command to execute rundll32.exe with arguments pointing to a remote URL, indicating a downloader or initial access mechanism. The presence of multiple suspicious URLs further supports this assessment.
Heuristics 7
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Excel 4.0 macro sheet (3 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: Win.Malware.Agent-9983617-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Win.Malware.Agent-9983617-0
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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 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://lupus.ktcatl.com/wp-content/uCccWJ/
- http://123breathe.org/error/Drs/
- https://packersandmoversbangalorecharges.com/cgi-bin/UrI6GM87K5u2y2pOW/
- https://greenesqualityflooring.com/error/kUO7NnkpMp2cs/
- http://new.hssus.org/wp-includes/blocks/eKID0QAfLUS/
- 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 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xml931aca2f208be70d374ebb6e3b5ce84d62043710cebea4a63abc358f6e3d2cda |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3792 bytes |
xlm_sheet_01.xml1301a9b68f708ecd53476001d2adc675d5907080f1329990cc388355cfbedfbc |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1278 bytes |
xlm_sheet_02.xml103e1830b20c8ca2f2e6d51a3a81673c3dd315f160a9ecbe580bdab4d6238de1 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 1275 bytes |
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