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

Static analysis result for SHA-256 8eabc29fd3e9196a…

MALICIOUS

Office (OOXML) / .XLSX

85.5 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: 2b9050ad2c7c810e2471831d302dbf98 SHA-1: 775cdbb083efa6ac995edf52f23f556f18ecf6ef SHA-256: 8eabc29fd3e9196a2258afd90380fb7a29da4f25d2f81e2695443e9e61fc1dd3
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros appear to be constructing a path, "C:\ProgramData\fjkgdjkngfdg\fjkgdjkngfdg", which is likely intended for the execution of a secondary payload or for establishing persistence. The macro content is heavily obfuscated, limiting a more detailed analysis of its exact function.

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
61074b59d1c76a91c01b3965e5101ee48c3bf71a1a996e85d4e128b61260aa28		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 3878 bytes

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