Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 596e436aed6d13b7…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 14bcf755a2359eeb9800e840bbf05f11 SHA-1: c305da1054a521b89ce09f29edee6fe92df74470 SHA-256: 596e436aed6d13b79e7180c6e9f93ab75106b15bf92eed17e308a8ae45354442
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This Excel document contains VBA macros that reference PowerShell and cmd.exe. The critical heuristic 'OLE_VBA_PS' indicates a direct PowerShell reference within the VBA code. The presence of a Base64 decoding function suggests the macro is likely obfuscating a payload that will be executed. The primary goal appears to be downloading and executing a secondary malicious payload.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d25d6d170f68dad861f62c972720e3aa6b99336aecee3b7d9d3091fc458db0a4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f03c4072e1548912f320d097de506308818057435acdfb78e8d26487a20af839		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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