Office (OOXML) / .XLSX malware analysis — malicious · f552b727c2ea726b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 08c6875bc81611e2ca718c13cb243d65 SHA-1: 7447b36ebed6fbce8c93ba7f4d7a426e96b8fda0 SHA-256: f552b727c2ea726bf41810bb5f5d2121b13f426ec0cb23201d4f8a9ce8f5fd47

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. The macro sheet content is heavily obfuscated and truncated, preventing a detailed analysis of its specific actions. However, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary commands or download further payloads.

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` `5edfd519ebecd98d24273017936e0627bdd8294bc105e877bc2a339fe8e7e746`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	7442 bytes

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