Office (OOXML) / .XLSX malware analysis — malicious · 94ee5cee4668dad2

MALICIOUS

Office (OOXML) / .XLSX

344.6 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 8e249503f14012819ed4313e1eb07d0d SHA-1: 09c399e1d077ba18679458fb30618414aa48af7e SHA-256: 94ee5cee4668dad2208b8df3c34e0f50d975bbd0a85e9beda5e06d972d1371b3

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The primary finding is the presence of Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are known to be used for executing arbitrary commands and downloading further payloads. The script content was truncated, preventing a more detailed analysis of its specific actions or any potential IOCs.

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` `695e278c4b8af62e5e44ebafa0c5a12ee5054c274408ed53c260686ac545c103`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	228196 bytes

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