Office (OOXML) / .XLSX malware analysis — malicious · 0c210c856d7b94ff

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 5a7254dcd135ffa0c950fb82e98008cd SHA-1: 8d8e18569e40c0bd0f40c5e686db844b6b7c589e SHA-256: 0c210c856d7b94ff365a5221b4207e2fe0b538be411a2def3f15dc88bc90c86e

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. These macros are capable of executing arbitrary commands, which is a common technique for downloading and executing further malicious content. The specific commands within the macro sheet are heavily obfuscated and truncated, preventing a more detailed analysis of the payload or specific execution path.

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` `199bde23a55ce6d2a7fa394599b372fc5a771368e97e545aaf9f3a47e5a9337b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4829 bytes

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