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

Static analysis result for SHA-256 5ccc8867cfba018e…

MALICIOUS

Office (OOXML) / .XLSX

116.1 KB Created: 2020-11-22 22:46:37 UTC Authoring application: Microsoft Excel 16.0300
MD5: df3cd583600089890e39bb398973ab41 SHA-1: 04f8b29b87c2f8475332cf6c3594e00384f79e0e SHA-256: 5ccc8867cfba018e258804501d3188368175067b72c9e1861209eb686eb9ad91
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 designed to execute arbitrary code, serving as a common method for initial execution of malicious payloads. No specific family could be identified, and no further IOCs were extracted from the macro content.

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
ab11e4359b0fb050fd1a018f1b11b465962537bc51f710713f0dab9393d947e4		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 95694 bytes

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