Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 db0f917d7def11ec…

MALICIOUS

Office (OOXML) / .XLSX

95.0 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: 6ecc41e1e8437bc677f6a24ace4346e9 SHA-1: 78b494d718d75d6a52d5d73dfd426fbb0dc4a1cf SHA-256: db0f917d7def11ecdcc207777751cb9b001c261182dce88f2c0348edb5b01f0b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Execution

The file is an Excel spreadsheet containing Excel 4.0 macros. The macros execute a WMIC command to create a process that calls 'mshta C:\ProgramData\excel.rtf'. This indicates the macro's intent is to download and execute a second-stage payload from the specified file path. The family is unknown due to the lack of further indicators.

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.

FilenameKindSourceSize
xlm_sheet_00.bin
f1aa8062e745d2e3550f12efbeb361a9b58b0d207480dc09e0e39487b69519f1		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 191940 bytes

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