Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 48645eee9db752e5…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 44f9ed0a3023cf01f16b8888304c898c SHA-1: 62bcedad2025aedc7fc08e4427a6d03a03bece5f SHA-256: 48645eee9db752e559d40ca710392983fd54f61c71f4babf2001437498f25c40
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 a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and decoding routine indicate a downloader or droppper functionality.

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
a09597b31162fe8bd5a0eaf211147f5f7a524e5bec991ea2528252d6b6dd6a5c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
ae875d85db3b6d6b0a694db61758dd52fd31a4ba6c577bc190c130a3a9a0e3c2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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