Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8adb9c268913977b…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0290d13a9b768b16e7e2997fa0f6f693 SHA-1: ea6206f2df8cd5000ddefb9832f8282f2c3253df SHA-256: 8adb9c268913977b2ac66a5b5a84b673176ffb584a9f92c927709da4b7801f03
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute PowerShell commands. The 'GetObject' and 'cmd.exe' references further support the idea that the macro is intended to download and execute a secondary payload. The Base64 decoding function is present but truncated, preventing a full analysis of its purpose.

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
48994f85243bc31218fb410f55784bbed8b2a7541979deb495cdec912cca65e1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c2c3751e78a2daba9b6da301f91bdff2da9781c9cc5176791c3e3ec86219c2e9		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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