Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f1ac6dde6f9b4f93…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b6f0f159ed56ef3a24cc345277eafdd2 SHA-1: c192b7b14c02b7c17a3e3b8fdcb8d360cbac999d SHA-256: f1ac6dde6f9b4f93ed59fea946887c3a41530483b42bc98834e09dd89e7b929a
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 PowerShell and cmd.exe. The GetObject call and the presence of obfuscated VBA code suggest an attempt to download and execute a secondary payload. The VBA code itself appears to be a Base64 decoder, further indicating obfuscation of malicious commands.

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
395c0baede33b9782fa45b4a85ad29b5d5d47089c657a25aa00c7914537461dc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
086f1ce1e50627ae0f5e1ebaff9a49073b52355d9b54b807d32a35f469ebf09f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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