Office (OOXML) / .XLSX malware analysis — malicious · 6ad42c31b49e95db

MALICIOUS

Office (OOXML) / .XLSX

80.0 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: 6c81e5cde9414a83dd257e5a173e18b1 SHA-1: 0ebc8b6de585016cbdee5449e212c271f5e947c0 SHA-256: 6ad42c31b49e95db94c513c977b05bf44683c915bdac88092459e58de6ed2744

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing multiple Excel 4.0 macro sheets, which are known to be used for malicious purposes. These macros are capable of executing arbitrary commands, suggesting the file's intent is to download and execute a secondary payload. No specific family could be identified, and no direct IOCs were extracted from the macro content itself.

Heuristics 1

Excel 4.0 macro sheet (10 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet 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.

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `bee3fd9d1ce99b02b35f5662e4de7e62bdd41e05deca34e537b522a1aeca442e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	322 bytes
`xlm_sheet_01.bin` `437e9f5e46f50f6264f1468611cb3a7016fd693f55a8d679ff97bada55b19d48`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin	2093 bytes
`xlm_sheet_02.bin` `bf9296aaf0e5b84a19f6b3ff4b9afe95753013f257b1d1c75c70cc1b08b9ad68`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.bin	477 bytes
`xlm_sheet_03.bin` `a500f1ae4d898900a3144ae215bd4e3f47736c4875919f139ec5546ed6597e8b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.bin	428 bytes
`xlm_sheet_04.bin` `ab3f84691f75f808a265fd47fd2de553fe8c7cf42364c345d2da1035041ddb59`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet4.bin	428 bytes
`xlm_sheet_05.bin` `333e01ee17df88556ba83b070e2d77a0478ddb01a29baf7fdef93732ee59798f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet5.bin	428 bytes
`xlm_sheet_06.bin` `136f099ac6cb64e1d7601355d317ccd460b2865c1d11e5b443b06a6d14ea4197`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet6.bin	428 bytes
`xlm_sheet_07.bin` `dbe22dd404c1f321e5a0fb3f96913e4db489106ba51a7dad6ad1e5cc3a952f21`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet7.bin	428 bytes
`xlm_sheet_08.bin` `cee664e2fc6f8587326643d7a2f63389c2e546edb39c94eedb830f20a7051f28`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet8.bin	428 bytes
`xlm_sheet_09.bin` `415f1451b36102d686540ecdf4d3c07a4666c68b1840c08ab5d0bff7af909409`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet9.bin	348 bytes

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