MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The sample is an XLSX file containing multiple Excel 4.0 macro sheets, as indicated by the OOXML_XLM_MACROSHEET and OOXML_XLSB_INTL_MACROSHEET_IN_XLSX heuristics. The ClamAV detection also confirms its malicious nature as a downloader. The embedded macro content, particularly in xlm_sheet_02.bin, contains strings that suggest the execution of a URL download function, likely to retrieve and run a secondary payload. The specific function 'URLDownloadToFile' is a strong indicator of this behavior.
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.bin0c99a669892a3d688b5e582ab7ee9b3c960826553f43135cd72df35a72fa3992 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 363 bytes |
xlm_sheet_01.bin1a4960a64babfd009ef3e79c49e85cfa06012e94a22feef8bd2d0eab05cbae0b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 692 bytes |
xlm_sheet_02.bin1da9df93994765bfe8618dd61c87a025cfa9eebe1240987f57c4f2aea1f5c74b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 2746 bytes |
xlm_sheet_03.binb3f0f3168986d7635ef3430ae3fb1d931c425d432b324f8d9a04de46f2c5d9c7 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 1619 bytes |
xlm_sheet_04.bin1f12f26e89b5a6aa4047fe7d8f9c25329603d1505d1e52ebfc497a72bca0fa69 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin | 573 bytes |
xlm_sheet_05.bin39037ca5ca5639d2660c72ea22d55471568feb73d129ff19a7c101212008c663 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin | 618 bytes |
xlm_sheet_06.binad9adccce41f15b5ce086894d5e987ce3edcb4f2c32f5480406d75a6a350ac73 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin | 766 bytes |
xlm_sheet_07.bin8f6bb85bb3edb8fc36e7ce5ac61392c8fbd9ceecfaaf5d597ef8d890b777fcb9 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin | 472 bytes |
xlm_sheet_08.bin64356cd6ba28a5606369ef8e9ec17d89b5a1eb804592c9b18e5dc36ff4e0050e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin | 423 bytes |
xlm_sheet_09.bin029bbfa3165ad0c04467d89d4682e1f527ed231beeb3964245db764c80dc297e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.bin | 754 bytes |
xlm_sheet_10.bin7dfb0df8873d7bad9389485bb6eb18e5829cbab986c0065efb69b192b2825406 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.bin | 679 bytes |
xlm_sheet_11.bin7df7d88a18630a561dd0e4d5b25c453d5051a8c0cc3f0f2838e22966fdece1de |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.bin | 799 bytes |
xlm_sheet_12.bin9514f12468d9c772f973a06942fb0d40eaf5b62440fbcb9a197ec4bda7c96587 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.bin | 619 bytes |
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