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

Static analysis result for SHA-256 593114427b347009…

MALICIOUS

Office (OOXML) / .XLSX

86.7 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: ffbeb4bb59cb660aacb7348641f25ddc SHA-1: cadcbd42240d93b7d6f04128524879fa02c7d5ad SHA-256: 593114427b347009f6df30c83366f5afa01500d458b46e1490d4b54c8609ab89
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros. The macro sheet contains a string that appears to be a path for a second-stage payload: "C:\ProgramData\fnsfunSfgRgnKjFsgNd". This suggests the macro is intended to download and execute a malicious file from this location.

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
3c7dbdc2b29d8a792fd844c965f4e1ba18193285a717817b961903e48bb12de8		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 4562 bytes

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