Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d4dad73924e386b9…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d19d6cfd8c6b4c4657dd105d743a0d4e SHA-1: 303faf15179f11ddd5cebcc449c4519e155c02b4 SHA-256: d4dad73924e386b90e5be1f80c3f3040ece5d96d9e1d0692da48e36c0366eb77
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 document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it is likely used to obfuscate and download a second-stage 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
c573427a757c1b139ff71e272dc6c029e37b494b14fddb4ea2b7c297fee6c708		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
1de2a7f78b5e580910b3fc03604e9317739ce16f8773cff259fa6378580f93fc		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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