Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7ecc5e983366f613…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 382b1e1bb158b04a083e6664ed48d241 SHA-1: b39a3a9e76a04823bf0dfefaeba39ce10cbe701e SHA-256: 7ecc5e983366f613c1664ee66744dcf9b20bd3d1445c97b7de9b2dec7d2efdde
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 cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute a PowerShell command. The 'GetObject' and 'cmd.exe' references further support the execution of external commands. The VBA code includes a Base64 decoding function, which is often used to obfuscate malicious payloads or commands.

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
3bf61ab345cc6366ef8051036921f073b32a7337e3b36cbe11c3e07a6fd52900		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
efa5f74e77ae40e608ba4cdbe369a3b3f3f8cbf3a88120e7d9fec75ce9b185ea		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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