Office (OOXML) / .XLSX malware analysis — malicious · b06e618ccaa90ecb

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 8393b785798215c5d4ddac261bc451de SHA-1: 68331341f7db0ccb31f36943221fa440e4b59d91 SHA-256: b06e618ccaa90ecbfb29c631db9e694d9abff39356e07d3efcdb218ab11dc837

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing Excel 4.0 macros. The macro executes a WMIC command to create a process that runs 'mshta' with a specified file path. This indicates the macro's intent is to download and execute a second-stage payload from the path 'C:\ProgramData\excel.rtf'. The file type and macro usage are common for initial infection vectors.

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` `c720505f5672c855116a94e114de4ab0c7a7dd970a4b4cf6006fa3a60e91fbcc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	160614 bytes

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