Office (OOXML) / .XLSX malware analysis — malicious · 4b51e0abe0352bfe

MALICIOUS

Office (OOXML) / .XLSX

86.5 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: 6f25bf66c30983f519b916902219f086 SHA-1: c2410354dae444847c4a469a019fdbbf2dad0a92 SHA-256: 4b51e0abe0352bfed040c474d8eeb1e7a7503a81a24dd9733c95132aba062660

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing a macro sheet, indicated by the OOXML_XLM_MACROSHEET heuristic. The macro sheet appears to be attempting to execute a command or create a file path, likely for malicious purposes. The reconstructed path 'C:\ProgramData\fjfkdgjkdfg\fjfkdgjkdfg' suggests an attempt to drop or execute a payload in a non-standard location.

Heuristics 1

Excel 4.0 macro sheet (1 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `3d2d574dceb05e42fbacc479f20415ba0aa0322c97dc73193aa5f184786799bf`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3880 bytes

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