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

Static analysis result for SHA-256 7126db94fed08151…

MALICIOUS

Office (OOXML) / .XLSX

73.7 KB Created: 2021-03-15 18:25:06 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3fcc54532401fc7b6857ead864e7f103 SHA-1: 2cff0e539baaf07eff71a5155d02105e7c595bd3 SHA-256: 7126db94fed08151cc8b631d78da3dbb1546bad163057c2d5ab2cd4d9e767b99
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are known to be used for executing arbitrary commands, often to download and execute further malicious payloads. The truncated script content prevents a more detailed analysis of the specific commands or URLs used.

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
eaa5305c9850261569a79505ea737883ad228d895d5cf3bfdb1e6b8049fe41b0		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 94320 bytes

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