Office (OOXML) / .XLSX malware analysis — malicious · c2c7dd6b33552ca0

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 9066fbd1b4023468a43011fdbaed5daf SHA-1: 85ca09b0fbba8d351f98cb572080b525d066535d SHA-256: c2c7dd6b33552ca01c2d43d53890b8393bc45cb988649ca80fc1766bda0577ce

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros. The extracted macro content reveals a suspicious path, 'C:\ProgramData\fjkgdjkngfdg\fjkgdjkngfdg', which is likely used to drop or execute a malicious payload. The macros appear to be designed for arbitrary command execution, a common initial access technique.

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` `4a0cb644b92a3f51fe7b6c7e20145243304ae42cd8b97e4174ef756abd99adc6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3454 bytes

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