MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The sample is an Excel file containing multiple Excel 4.0 macro sheets, as indicated by the OOXML_XLM_MACROSHEET and OOXML_XLSB_INTL_MACROSHEET_IN_XLSX heuristics. The embedded macro content, though partially obfuscated, contains the string "URLDownloadToA", which is a function commonly used to download files from the internet. This suggests the macro's purpose is to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature.
Heuristics 3
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Excel 4.0 macro sheet (13 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. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
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XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSXOOXML package is named .xlsx but contains XLSB workbook parts and an international Excel 4.0 macro sheet. This hides XLM macro execution from scanners that trust the extension or only inspect XML worksheet parts. The technique is macro execution, not a document-parser CVE.
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ClamAV: Xls.Downloader.GreenOffice01220-9937699-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.GreenOffice01220-9937699-0
Extracted artifacts 13
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bineeb75205298b6600b0aab8c17e7dcbff28a93f5c592e0ca036ea3d1b9d41b2f9 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 363 bytes |
xlm_sheet_01.bin50326a4bc6116eddbb1ac1f32baae6c22912e3323d883505a7b4bb3156bfbfe1 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 632 bytes |
xlm_sheet_02.bin7758715f90b1e2a29f4fcdc71997ce8f27102b8b2141a050486ac0c82ce7c669 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 2778 bytes |
xlm_sheet_03.bin381fb5af5072c46099818073d4f4f7e25e92c086ae911eca3a3ce413b68260b3 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 1619 bytes |
xlm_sheet_04.bin029b6e2ec04efa1ede9033294f5fcbb15ef1d930cb1be4f48d30fad33291527e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin | 573 bytes |
xlm_sheet_05.binf4c36501fcd837ce3610462cc017ebb0f4242cb9407a3d4ea1c53c1a3b09d971 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin | 1303 bytes |
xlm_sheet_06.bin064cb0a11d1b90164304ba7551b0fc0c7e70edd9fd971c8aa51317d32fe2bf4a |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin | 766 bytes |
xlm_sheet_07.binbfa3ca1f6f49bc0eab81923b80e06cdfe8faba5cd597863fb1a04e88b1c0afc0 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin | 472 bytes |
xlm_sheet_08.bin88846bf63632316812e30d4b9f020c508658087d6a12705d047d09eb3354629d |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin | 423 bytes |
xlm_sheet_09.bine78d03fd258d00d26b22c7f736d295d3dd733f9e5a3f3cd2df74bb130ff60627 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.bin | 754 bytes |
xlm_sheet_10.binf6208e8bd141d432b43eaf367fa23dcbad633afd100d9c970e3b58a01e97f40f |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.bin | 679 bytes |
xlm_sheet_11.bine11fa3d3d07b73d13177c297f59091a317ffdafd76834bc0bdd302ad4b481d17 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.bin | 1447 bytes |
xlm_sheet_12.bin7f02df8272ff00061a43e4abc8bc5260e5ab3ada7a5a50961cef79686b6ad33a |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.bin | 579 bytes |
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