Office (OOXML) / .XLSX malware analysis — malicious · a17c109e672bba80

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f8e4a2e1b1ad28fbe221f265062c0290 SHA-1: 1a91680f19ceb45d40abe644638db80b042a5ad1 SHA-256: a17c109e672bba80800931460f58d3c869fc81b6a191ac43abf37b13f3466210

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is identified as an Excel 4.0 macro sheet, which is a known method for executing arbitrary commands. The macro sheet contains a string that appears to be a path for a program to be executed, specifically 'C:\ProgramData\fjkgdjknfdg\fjkgdjknfdg'. This suggests the macro is intended to launch a secondary payload from that location. The macro sheet itself is the primary artifact, and its structure indicates malicious intent for command execution.

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` `a2ec00faf9d6372e7f90f2b5eacc27f4d336aa597073a4000b00366952f526e7`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3876 bytes

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