MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1105 Ingress Tool Transfer
The file is an Excel document containing multiple Excel 4.0 macro sheets, identified by the OOXML_XLM_MACROSHEET and OOXML_XLSB_INTL_MACROSHEET_IN_XLSX heuristics. The extracted macro content, though partially truncated, contains strings like 'URLDownloadToFileTo' which strongly suggests the intent to download a second-stage payload from a remote source. The ClamAV detection further confirms its malicious nature as a downloader.
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.bin1686ce2c491a649c345a9500895dd65862f39771e436e7cb20d9e03e00be19fd |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 363 bytes |
xlm_sheet_01.bina529dae7d8bdfed5805bdcf1fc60f52b2d3375146b8fb813abcc455feade132b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 632 bytes |
xlm_sheet_02.bin5dcbd7dc9e28eff6ca1489493649e07dcf47b5ec1076570d73081f691977fbc3 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 2762 bytes |
xlm_sheet_03.bin3322e059eba46e942fe7c99ae5febfeeb58d1e7067185a4fa590c0379d72ff10 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 1701 bytes |
xlm_sheet_04.bin138dfffc4dc4262a3f197627d3027e6ba195a73cad3290df46727b676fe2283c |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin | 675 bytes |
xlm_sheet_05.bin2e300f6e7ac4d1d915d7b3601a17a26d203f390a17150e1c07e894392ea98a10 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin | 720 bytes |
xlm_sheet_06.bincfbad5d0aafd4fefa3942c1874dc9e6267e8c195c45232bd3d9fadce9693089d |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin | 826 bytes |
xlm_sheet_07.bin7da484251d8ff7a8859876e2465fea33f9a698b8d66355e82a953026c27401ef |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin | 552 bytes |
xlm_sheet_08.binb50a4c21bf7e3c1c167e9126c04f574ffee76408017d18e2651b1f275f4e4015 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin | 483 bytes |
xlm_sheet_09.bine8dde2fe7299fe5c29f354689bbc2e0de8d59e920351db2c3c3e5572ed8a1618 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.bin | 856 bytes |
xlm_sheet_10.bind4c560579f32f1046c57818eed9c1c3451a96b91d798e1b2a8d256a98c394728 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.bin | 810 bytes |
xlm_sheet_11.bin8be06878766f561b6355428b8ab25e3928e646756c3c1bf8d87ed41cac091d5b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.bin | 821 bytes |
xlm_sheet_12.bind626e9b87216fc097abb2cbaec60ac53c6366a9f2a130d478e077a019d52c6b0 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.bin | 679 bytes |
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