Office (OOXML) / .XLSX malware analysis — malicious · f96e0a72f210bbc7

MALICIOUS

Office (OOXML) / .XLSX

111.5 KB Created: 2021-03-29 19:55:06 UTC Authoring application: Microsoft Excel 16.0300

MD5: 08078f7f25e04034a4b1aadfe2088bdc SHA-1: 6d83d7974f49d9dd30318bfd58a4beea5051f0e8 SHA-256: f96e0a72f210bbc7c168844f2c55309906d6ef1b0ef27cc1b87e73b92d8a63d9

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, a known technique for delivering malicious payloads. The macros are heavily obfuscated and truncated, preventing a full analysis of their behavior. However, the presence of Excel 4.0 macros strongly suggests an intent to download and execute a secondary payload. Further analysis of the full macro content would be required to determine the specific family or detailed execution flow.

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` `0d7587152bc0f528e5a96e63bf55d518f873054a6c56d73970556b76fed247db`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	94808 bytes

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