Office (OOXML) / .XLSX malware analysis — malicious · 0e620b9c0c268d3a

MALICIOUS

Office (OOXML) / .XLSX

203.1 KB Created: 2021-02-26 07:53:41 UTC Authoring application: Microsoft Excel 16.0300

MD5: 25e62d9592a63057cb164e46b1d5c2f2 SHA-1: 1b35686b7a87eab88cb534c89554ae7e34928ab5 SHA-256: 0e620b9c0c268d3acda918f15c84c61e06636e2f170ac241a256977a4c44123b

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing Excel 4.0 macros, which are known to be used for malicious purposes. The heuristic firing indicates the presence of these macros, suggesting an attempt to execute arbitrary commands. The macros are likely used to download and execute a secondary payload, a common technique for malware delivery.

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` `45f69eb0dda87b16c3469bb1a9f48dbda1658682ff921f6b504396d8938903af`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4569 bytes

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