Office (OOXML) / .XLSX malware analysis — malicious · c451703271010785

MALICIOUS

Office (OOXML) / .XLSX

94.4 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: 0a6f9ae95dfbf30c9c0952909f6032f2 SHA-1: b47fdb8c8cd6e1c6b5a0311c41acc5a778abf975 SHA-256: c451703271010785990d205e97fc93b1f949a3c4ca736798671ba8107274ed81

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros. The extracted macro content reveals a suspicious path, 'C:\ProgramData\fjkgdjkngfdg\fjkgdjkngfdg', which is likely used to stage or execute a malicious payload. The macro's intent appears to be the execution of commands from this path, suggesting a downloader or initial execution stage.

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` `06efe4121c20c40d5c014bce71ccc843ee26cfc484f350698b925c88a2997294`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3794 bytes

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