Office (OOXML) / .XLSX malware analysis — malicious · be37b4480c4aac0a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 3e98c1cbaa19c87ff8354b9fcf8b05e8 SHA-1: 1a02f9d98694f6408c21aeef50f9d711111a0470 SHA-256: be37b4480c4aac0a6a367d9673427ce790c073c721bcef0db01570f0ff0365a5

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an XLSX file containing an Excel 4.0 macro sheet. The macro sheet contains obfuscated commands that, when deobfuscated, appear to construct a path for a potential payload: "C:\ProgramData\fjkgdjkngfdg\fjkgdjkngfdg". This suggests the macro is intended to download and execute a second-stage payload from a location specified within the macro itself, likely to achieve initial execution and potentially further compromise the system.

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` `c0897906784df42696ce8992796612810385004713f2a18e2640ba868d9879f9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3376 bytes

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