Office (OOXML) / .XLSX malware analysis — malicious · 61d703cb25b23a38

MALICIOUS

Office (OOXML) / .XLSX

79.1 KB Created: 2021-03-14 21:05:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: a89808c7ee3cfdb2dd85c672c7b0392e SHA-1: 56f125b322a2b716dff33841973c460f0cbb7880 SHA-256: 61d703cb25b23a38d3ccbe65660df1ceaf0ca5fb37a899f47831e901091efd75

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are capable of executing arbitrary commands, which is a common technique for initial execution of malicious payloads. The specific commands executed by the macros are not fully discernible due to truncation and obfuscation in the provided script data.

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` `1767768f3f9031ea3db3ebc55d934343091df1817f938da18a186a5e80e638c5`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	88880 bytes

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