Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ad8a7ec10ec0264e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3d11e2eb6d41e25ae4fd742e85a82c76 SHA-1: c194b252812fd65628cdf4532da8390b63ea4ce6 SHA-256: ad8a7ec10ec0264e2f5924f080ba41a947986ba963cd9c79af563aa7334e39d2
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 script's functionality appears to be obfuscated, but the references to cmd.exe and PowerShell indicate a likely intent 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
6ba461b6a1e231fe865f112e43a386bce0097d7d57365971a8d068204d6ee11e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
13f041832891afa956145e3dba5f320524b894862cafe96cad77f06bbdbaa850		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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