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

Static analysis result for SHA-256 acdb2120e05dd863…

MALICIOUS

Office (OOXML) / .XLSM

53.2 KB Created: 2021-05-04 07:41:00 UTC Authoring application: 16.0300
MD5: b6921ce0f1b94a938acb6896cc8daeba SHA-1: 932606b71dcdf84a83fb1ad61ba3251242f59477 SHA-256: acdb2120e05dd8633ccb5bf6d1c542a132066d116c7d41aa4235c70f43e0a7f0
88 Risk Score

Malware Insights

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

The sample is an XLSM file containing Excel 4.0 macros, which are known to be used for malicious purposes. The presence of hidden sheets and VBA macros suggests an attempt to conceal malicious activity. The document body contains obfuscated data that likely represents commands or payload instructions. The primary attack vector appears to be the execution of these macros upon opening the document, leading to further malicious actions.

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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