Office (OOXML) / .XLSX malware analysis — malicious · 7cca2add4ceb4d53

MALICIOUS

Office (OOXML) / .XLSX

62.2 KB Created: 2021-03-14 21:03:54 UTC Authoring application: Microsoft Excel 16.0300

MD5: 155f6276f61c56016e418efaaa88d84d SHA-1: 45f7ea1fa45d0669c4e98b8b8b059fe82655de43 SHA-256: 7cca2add4ceb4d53b7b6ed2ea2ca78544554350a705ffcf90b82327a29f792ce

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros, indicated by the 'OOXML_XLM_MACROSHEET' heuristic. The macrosheet content is heavily obfuscated and truncated, preventing a full analysis of its behavior. However, the presence of XLM macros strongly suggests an intent to execute arbitrary commands, typically for downloading and executing further malicious content. Due to the obfuscation and truncation, the specific payload and delivery mechanism cannot be determined.

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` `609a0b3221478eccb19de4278f12cc55d4d80d27ad0e495bef27ef5903b23a5c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	92099 bytes

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