Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 003f825d551d725b…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1045c5489410868964c00c79b04d5d32 SHA-1: 7e50e6e9a797924954b13b5e3e695fee0c3374d4 SHA-256: 003f825d551d725b75bc2e3dbadc0689a617908e954b1ef4ed827b5ebbc3b1c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The presence of a GetObject call further suggests an attempt to execute external code. These indicators point towards a macro-based downloader designed to fetch and run a secondary payload, though the specific payload and its destination are not discernible from the provided evidence.

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
5bc1b43bc227f9130773ad8ca6afc25e9b3bc02d75d3265ceb1f1bbcf43fc428		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
37985e0878cb67445a9e645002fbc7e8598d3fa47ea58a44f11f6d03e46a3cc5		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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