Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 9d6581dbec6c8f74…

MALICIOUS

Office (OOXML) / .XLSX

256.3 KB Created: 2021-03-22 09:44:25 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4bc7c60bacd4c0e15743821f71d689e3 SHA-1: c3adb7f5fb154ca9b54ada5db143a681018864f3 SHA-256: 9d6581dbec6c8f74f2d999b5b72a8d8f515bd71c1d0966754374b8a16d3c4bd7
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an Excel 4.0 macro sheet. This type of macro can be used to execute arbitrary commands, which is a common technique for initial access or payload delivery. No specific commands or URLs were extracted due to the truncated nature of the 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.

FilenameKindSourceSize
xlm_sheet_00.bin
cc762010d8379b425fbc50f271668d6906552dc615c0470da17c8ed845a6f9e5		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 233329 bytes

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