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

Static analysis result for SHA-256 ba456dfc76d43bd2…

MALICIOUS

Office (OOXML) / .XLSM

53.2 KB Created: 2021-05-04 07:41:00 UTC Authoring application: 16.0300
MD5: 10782e2241323a2f47cbef1fb7475a90 SHA-1: e86d971ed3595934f29d4f737997a51085e6cde4 SHA-256: ba456dfc76d43bd258c193889dcc1a347d65fb5aeae43066e671f719aaae60c5
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell

The file is an XLSM document containing Excel 4.0 macros, a known technique for executing malicious code. The presence of VBA macros and a hidden worksheet further indicates malicious intent. The document body is heavily obfuscated and does not provide clear user-facing text, but the macro sheet structure suggests it's designed to run code. The primary function appears to be executing embedded macros, likely for payload delivery.

Heuristics 4

  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 2 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9b5ae128e5fc116df28fc658823881fe15090068d96892127b1af66ba55db3da		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2159 bytes
vbaProject_00.bin
b6e89f4462f4d0c8559e81c60276108c3dd541e5941201d6fe916fad570e1fc4		 vba-project OOXML VBA project: xl/vbaProject.bin 21504 bytes
xlm_sheet_00.xml
a3875d0d13471c086c384acea263578698bebf1eeecce711e623eade1a898d93		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 836 bytes

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