Office (OOXML) / .XLSX malware analysis — malicious · 45ae12619c81ae06

MALICIOUS

Office (OOXML) / .XLSX

98.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: 8f80f57c941db3d6a9be756712cf4731 SHA-1: f8c29c8855eb684951b4d94dcd906da9eed5ecf6 SHA-256: 45ae12619c81ae06b36c0d8d2bffa1872fa002a75db849ad7115588c8f66f692

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macro sheets. The macros appear to be obfuscated, but the presence of multiple macro sheets and the critical heuristic firing strongly suggest malicious intent. The macros are likely designed to execute commands or download further payloads, fitting the pattern of a macro-based initial access or downloader malware.

Heuristics 1

Excel 4.0 macro sheet (3 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`emf_00.emf` `ab58818ae1864807b22f8a58a75f7fa8703ecb19a2352bdb47469f366b868e59`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	1108 bytes
`xlm_sheet_00.bin` `7ba8c7dae215c3d653270796d8570b3810c64068590cf64325562d684e829370`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	1340 bytes
`xlm_sheet_01.bin` `cb1f1a0b36df7c5b1ecd6c45b74a2d4711b2827f0ee30f82c9df4f6bc63e617f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.bin	1509 bytes
`xlm_sheet_02.bin` `ab6060707b634032a9e28cdf4014bbeee5441e8ba06b1724bdb26e4c68089d59`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.bin	1296 bytes

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