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

Static analysis result for SHA-256 e6e6e7e914f6ace3…

MALICIOUS

Office (OOXML) / .XLSX

83.9 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: 565d21f02002e9a8354ae15619f763db SHA-1: 8e4301a18036a1c373a1de2b6b7e4924de62c2b2 SHA-256: e6e6e7e914f6ace3d054e67c869ccd8578740751f0ed915c0114a4db5427d162
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic

The sample is an Excel file containing Excel 4.0 macros. The macro executes a WMIC command to create a file named 'excel.rtf' in the C:\ProgramData directory. This file is likely a second-stage payload. The macro's intent is to download and execute a further 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
eac7ab25b5d27f85cf0ece877d7cf9bb81841cebc859a5d0fd3b0e74be58de23		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 59524 bytes

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