Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 acb39fe3f18422ea…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9924a964adf16752015cf52409b9f709 SHA-1: a90bae612d914d198fde77c8e09e326266b9e508 SHA-256: acb39fe3f18422ea68f6a4792a3cd51259fbee5b37bcabb45685adc2c17fe1de
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 sample is an OOXML file containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands or scripts. The GetObject call further supports the possibility of object manipulation for malicious purposes. The VBA code itself appears to be obfuscated, but its primary function is likely to download and execute 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
dad718627313a79fa31d92983d18e33e0a3db7cae33526c82398ca2238b1404f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
223d1f62987804cf68b0172832b0a656d04493f1f3c0e3346ce571bc3321328e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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