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

Static analysis result for SHA-256 17d6e5840bdf7fd9…

MALICIOUS

Office (OOXML) / .XLSX

68.5 KB Created: 2021-03-15 18:19:11 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5d9b2037e7a7c0f0a12a344cc7418a2a SHA-1: 2e207c0a5b051817cbb6c3670f9b4ee300b0278b SHA-256: 17d6e5840bdf7fd9a447c70388afd98dfe95a6e4818954010fa1b9917f2d2a8e
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 often used to download and execute further malicious content. The script content is heavily obfuscated and truncated, preventing a more detailed analysis of its specific actions or 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.

FilenameKindSourceSize
xlm_sheet_00.bin
8256b4eb17a8289dcef04247b68000b42585c7886fa4627de6cb038ece741c73		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 96758 bytes

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