Office (OOXML) / .XLSX malware analysis — malicious · ddc1096e9f1b62f1

MALICIOUS

Office (OOXML) / .XLSX

325.8 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 85b3804f8d20900dcbc7fcfaed191898 SHA-1: d1d9af8e0feeaae8cf58df889258443afce050ee SHA-256: ddc1096e9f1b62f1cb113f470babdeda31253173d41234e21afe8f4fcd5ffa81

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications

The sample is an Excel file containing Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to download and execute malicious payloads. The macro content is heavily truncated and obfuscated, preventing a detailed analysis of its specific actions or 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` `093487e48e28d190a46f6c7112c1641356a6e1111a04401eb46d7da01d87db20`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	230055 bytes

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