Office (OOXML) / .XLSX malware analysis — malicious · 1f54e64fd93c9a98

MALICIOUS

Office (OOXML) / .XLSX

309.0 KB Created: 2021-10-04 08:20:54 UTC Authoring application: Microsoft Excel 12.0000

MD5: 242580c760f9737b951e7d3ce4383aff SHA-1: 84d3ab6192d09e2b54614ef565df9eaf0b016e76 SHA-256: 1f54e64fd93c9a98b00191291e5bcb2ef5904fc7941d5484d4e6fb27565bc97c

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing a macro sheet, identified by the OOXML_XLM_MACROSHEET heuristic. This indicates the use of Excel 4.0 macros, which can be leveraged to execute arbitrary commands. No specific IOCs were extracted, and the macro content was truncated, preventing a more detailed analysis of its payload or persistence mechanisms.

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` `5755c40d81a8452707a1e888ed0d90a0866745c7a43ff900e8c9f181c41aed40`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	1673804 bytes

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