Office (OOXML) / .XLSX malware analysis — malicious · 62583d932aab55a2

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 1e9da75914cb0be970196c51c2aed6df SHA-1: 3f1a77ac40dc7887f1f28586be8918c7a482c441 SHA-256: 62583d932aab55a27114175f3e8e96944d95360a66fa17fd9cb46529e1077e84

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel document containing Excel 4.0 macros, as indicated by the 'OOXML_XLM_MACROSHEET' heuristic. These macros are designed to execute arbitrary code, a common technique for downloading and executing further malicious payloads. The specific commands within the macros are heavily obfuscated, preventing a confident identification of the exact payload or C2 infrastructure.

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

Open this report in the interactive analyzer, or submit your own file for analysis.