MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The file contains multiple Excel 4.0 macro sheets, which are reassembling formulas to download and execute payloads. The heuristics indicate that the macros are designed to download files from the specified URLs, likely to execute a second-stage payload. The presence of these macros and the download URLs strongly suggest a downloader functionality.
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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XLM payload reassembled from CHAR()/split formulas critical OOXML_XLM_REASSEMBLED_PAYLOADAn Excel 4.0 macro sheet builds its payload inside the formula token stream by concatenating per-character CHAR() calls and string fragments, so no WinAPI name, shell command, or URL is ever contiguous in the .bin for a literal-bytes scan to find. Reassembling the formulas recovered download/execute API names, LOLBin commands (regsvr32/rundll32/mshta/wmic/powershell), or a payload URL — the de-obfuscated download-and-run kill chain.
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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.bin08b2a21dfd49ba82acc3e98fa2548503ea70375384baae9690f9b9f92ee72a12 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 363 bytes |
xlm_sheet_01.bin75486df1e8fdc8dfcfa9347e2efdacc8c653c3f2057c715406ef8db6742ee804 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 632 bytes |
xlm_sheet_02.bin62069c771b71f4e449852a9717d0e3ee529ecca6497ff21cb92f7f53c4d1b43c |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 2766 bytes |
xlm_sheet_03.binae5e83e6d426668a5db416906d420732f1fdd9591d423b86f2b9f1dcd9fa44ac |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 1619 bytes |
xlm_sheet_04.bin2cd9dbeea24ca020fd0a4017b931dd97c95e7c0ab519355790f0ba447b4a3039 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.bin | 573 bytes |
xlm_sheet_05.bin5009dc8e79faedbbf6d81cc8ab84c37fddbbf642b83acb0a4f501b89844ac3ca |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.bin | 618 bytes |
xlm_sheet_06.bincd13478f2e3c7cf4b2507e646c0ceb5fea3e2f93cca4db2727dc940a10700abb |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.bin | 766 bytes |
xlm_sheet_07.bind6cbc03e36305aa993ba351dfcc3c9f2613ba6f5108c24fb559e4b12cff76c9e |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.bin | 472 bytes |
xlm_sheet_08.binfe33ad0661ee70bb32c1080c3584fa621afd5781d67903179cd30bf602806937 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.bin | 423 bytes |
xlm_sheet_09.binff4e973b54b80c00d226e9c4a283940eb8435e9810d5d202ee1f5db363852b06 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.bin | 754 bytes |
xlm_sheet_10.bin6136e300f8261bd0e71a47aed8dd19bafdab22d27cb4eaa966ba836779f08b49 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.bin | 679 bytes |
xlm_sheet_11.bin46a26398a13684a16d8ede38746c526be4025503508fe8a89a3748973af9a2d3 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet4.bin | 799 bytes |
xlm_sheet_12.bin52cbcb9c330923e6a38883615db2b9d510da997b15c7142598ab08d9f0a99559 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.bin | 619 bytes |
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