Office (OOXML) / .XLSX malware analysis — malicious · 1143602eb7ed97e7

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 7c03be04d80d2cfde006a4662886abfe SHA-1: 78b9bb33c9144e3cddb93733170f9aaf17bd2bb1 SHA-256: 1143602eb7ed97e7a6b654fe702d7cbbb118108beb909f649a661d7a0d3f24fc

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, 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 stages. The specific commands executed by the macros are obfuscated and truncated in the provided evidence, preventing a more detailed analysis of the payload or specific IOCs.

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` `cc0795655fd472e193a7c19a6f89e8f17317ec149d5b775d18ef08bb4f1644ff`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4675 bytes

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