Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4b8785e3f67c2213…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8aa0555344546f2c72aa6315b30ac79f SHA-1: 8438710f99fc7910f6f493d89b7f41b2c8b7107b SHA-256: 4b8785e3f67c2213b8c040f14c5a0d4930b25c5969aa7356094384df98c715aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project strongly suggest malicious intent. The VBA code appears to be obfuscated, but the references to PowerShell and cmd.exe indicate an attempt to execute commands, likely for downloading and running 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
910d5db9809060a872bda626b9c781ad2305c9b0df269e1cbc99e15748dc2ca5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a5ca91d69a45c6cae745eac55bd1757e778a839c23ccbe889ebed2beb9311e36		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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