Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 771e6e5a08fea0b9…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f28007e7d5aba295ddc14ac79661ee5b SHA-1: b655b4847e508a3174e3d36fedc75fd7319e44ed SHA-256: 771e6e5a08fea0b9a3f1bd671a7546998a360f4f33a6af3275368c13d9fce100
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 indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute external commands. The GetObject call further supports the likelihood of payload execution. The VBA code includes a Base64 decoding function, which is commonly used to obfuscate malicious payloads.

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
aacbc28cc030b46fbd4c0bd6caa0b2d306bf9337f4d7aac8ef432fb33201dcf5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2c74f18da0cdcd267dc8aad5d70f9370b68d11f2a191f794a73cba1b6a7b0b02		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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