Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 89d6bd4028509bd5…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9edde89320944e89d6ccf82fa79fed4f SHA-1: 8835e667978edb3accecbca6d2ed0555f36073cc SHA-256: 89d6bd4028509bd5ffd30747a9cb27d7482854d2511d2e8098dd7530ba495668
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an Office document containing VBA macros. Heuristics indicate the macros reference PowerShell and cmd.exe, and use GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators strongly suggests it's designed to download and execute a second-stage payload. The specific family is not identifiable from the provided evidence.

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
751b136521b18a49ff67a509678dfad030f41a423d5f09cf8db8fe4c3d73f5d7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
2365a5a0c4918b8afc56478b61fc571c737445b073d9f160a7ccdd80538494a8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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