Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94e24c8bea94f8d0…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3e18532d37e4f39c3cd742b6300a3829 SHA-1: f079778b12cae0af2d0bc2b66f9201ddbad8a7df SHA-256: 94e24c8bea94f8d0d15228ef176e0cc23c7a5eb8b4be3f55ab203e308eb19f84
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The VBA code itself appears to be obfuscated, including a Base64 decoding function, suggesting it's designed to hide malicious commands. The presence of these elements strongly indicates the macro's purpose is to download and execute a secondary 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
8fae5a1d8746f930d2bc797471559014170da7fbec6bb6b2441877ccdae4d80f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c41e11b256e3e36c53046d926b79ef632bacbe25079c29ae705b45dbc7b39ec3		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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