Office (OOXML) / .XLSX malware analysis — malicious · 621fcccd04c40984

MALICIOUS

Office (OOXML) / .XLSX

106.8 KB Created: 2020-11-16 23:27:24 UTC Authoring application: Microsoft Excel 16.0300

MD5: 093e32a1925f58f4cd3307b7759e0991 SHA-1: ff9012ee254e043a1bcea19631baa8f5cec83c66 SHA-256: 621fcccd04c409841023319bf49ee099c3e3a53a8b008722a25a6e5fb3a9e379

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristic 'OOXML_XLM_MACROSHEET' indicates the presence of Excel 4.0 macros within the XLSX file. These macros are likely designed to download and execute a secondary payload, a common technique for initial execution and further infection. The truncated script content prevents a more detailed analysis of the specific download mechanism or target.

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.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `a1cf0affd6ef86341f3d9187f183f9dd627072d4d87685e809321946640b71e0`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	95119 bytes

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