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

Static analysis result for SHA-256 56e7b2005961a072…

MALICIOUS

Office (OOXML) / .XLSX

90.6 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: c0ba3e41c19da601eb852e9cd468012b SHA-1: 151cad874dce5400b1cdb1a4f6114c296311f76a SHA-256: 56e7b2005961a0726ac94e50ed03bfcad15700e3aee1be840ee2b827f7798680
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. The extracted macro content is heavily obfuscated and truncated, making it impossible to determine the exact commands being executed or reconstruct any specific IOCs. However, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary code, typically for downloading and running a second-stage payload.

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
581bcfff69d30563f7064b25e5af724094694b091f573fbed1ab44dcd5166567		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 7603 bytes

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