Office (OOXML) / .XLSX malware analysis — malicious · 1d51e05a14d998ab

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: dd5423a5b6c03e67f6ce065c683148a4 SHA-1: 89b00914a44b9cd747e82651c5f80657b15c1d89 SHA-256: 1d51e05a14d998abf7224f3d0aaba612504437c8c21d7ff12715f4e1fad6187c

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing an embedded Excel 4.0 macro sheet. The macro sheet appears to be configured to execute commands, including writing to a path within 'C:\ProgramData\fjkgdjkngfdg\fjkgdjkngfdg'. This suggests the macro is intended to download and execute a second-stage payload. The exact functionality is difficult to ascertain due to obfuscation and truncation, leading to a moderate confidence score.

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` `8ebdbc0deaa27096051df17fba7f77809b920853f4a48027d08fd2788b5cfcc4`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3180 bytes

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