Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3c629e3ec579baba…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 04f88776eb3e909e780294e80178d5f7 SHA-1: ad8fdeab8cc78c2ac6694bff2f915ac9478e63f9 SHA-256: 3c629e3ec579baba384e902ab4ad44b07626841615c8ac287dc2a6dc89fee1c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the critical OLE_VBA_PS heuristic suggest that the VBA code is designed to execute a PowerShell command. This command is likely used to download and execute a second-stage payload, a common technique for initial access and further compromise.

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
3685950762d0bb7939ea308d8ad696384af653970b6be54ee93038c0bcad4559		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
a73d75cceb1aaa4c8e4433978ddb70b61e1fe292eb24613972b96bd244d3df66		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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