Office (OOXML) / .XLSX malware analysis — malicious · 189df622ee2e94b0

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 8aaa8e9940ecb230ff58d900bcbfecc1 SHA-1: 79546b838e7c11fc781e5fcb659c73e11eb3ecab SHA-256: 189df622ee2e94b02ca9056d9afcb6cb3f3d091b62624741a7bfd583a228c25b

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 critical heuristic firing confirms the presence of these macros. While the macro content is truncated, the presence of XLM macros strongly suggests an attempt to execute arbitrary commands, likely for downloading and executing a second-stage payload. No specific family could be identified.

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` `a2750e0a456788fd165a3f364ed7f5da2fcf91e8c6475665a467bdc9c2d041f9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4569 bytes

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