Office (OOXML) / .XLSX malware analysis — malicious · 3080046286b45a32

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 1440afea62cea86e300488df93e45b97 SHA-1: c558a0e02374ae89b90ac7ec64e87b5c7821825a SHA-256: 3080046286b45a32ba67a4a540931fa9cb2c09a857c68e03c00c57f00d6110da

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, as indicated by the OOXML_XLM_MACROSHEET heuristic. The macro sheet contains a command that appears to construct a path in `C:\ProgramData\fjlkdjkngfdg\fjlkdjkngfdg`. This suggests the macro is intended to execute arbitrary commands, likely to download and run a second-stage payload from a remote location. The macro content is truncated, limiting further analysis.

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` `84ff430dc65e43e49081e2178cc06008490ef6ffe95f8bd437adf466913a6567`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3876 bytes

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