Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b9595e162ece4ce2…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 06c58bd2bd39ecfafca1f8248774602a SHA-1: c938f10ad68aa9f00963605e4721337d2d184d5f SHA-256: b9595e162ece4ce266b1cb43636d0ccd99e01c6eb1b5b82cd654214a8da95e72
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 GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code appears to be obfuscated and includes Base64 decoding logic, indicating it's likely preparing 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
f51cc0b1ca71e42c4c246575087d1ed1533184426a92efcd0ad3c38c27d60f6a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d2b5af80a28fb80be61ae74253b7abef16ca18948a39d65cbecf191161ece742		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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