Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e45eda88e23edbee…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ce5b618f144a7fe88970162a13675cdb SHA-1: 1b122c56dd180e82958937ae5d7b967b401b4a82 SHA-256: e45eda88e23edbee54a4e3e7d9a5d7ab8ca7788c464ee8cc673d7b1b8ce5d399
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The presence of a VBA project within the OOXML file further supports this. The VBA code appears to be obfuscated, but the references to cmd.exe and PowerShell strongly suggest an intent to download and execute a secondary payload. The GetObject call heuristic may be related to payload execution or interaction.

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
2ec4537f49a2d260475e4f5c2459993d989406de1834d2962a050a1fa771f989		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5d8aafa4718e876ee95113a8b5be74d00e40ff0c882bef6370ac0a45412e784f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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