Office (OOXML) / .XLSX malware analysis — malicious · 32a44e4ea174ba6c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: fa649101f4572257f357a6145c932c57 SHA-1: 72f4526d9ba63165225e07c615307c6c47756717 SHA-256: 32a44e4ea174ba6c7e4ff7efb63594ac55b54418ff29b9cbf9e4f1e9fa1572d8

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Service Execution

The file is an Excel spreadsheet containing an embedded Excel 4.0 macro sheet. The macro executes a WMIC command to create a process. This process is instructed to download and save a file named 'excel.rtf' to the 'C:\ProgramData\' directory using 'mshta'. This indicates a likely downloader or initial access stage, aiming to retrieve and execute a secondary payload.

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` `6cb60b652de59ce82a79f2c1ebe509acc4910793413c7d0bde4e33cdebce837a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	60667 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.