Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dd7d9b7ae797280a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3e53ca5430a4048256f571314ff77283 SHA-1: e1461fdecf6b7e904920b1c9520781f8aa30362b SHA-256: dd7d9b7ae797280a25932e424d5841c513843a455a0b447daeff9222cc976542
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

This Excel 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 includes a Base64 decoding function, which is commonly used to obfuscate 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
94b5b691e885279ca73da435f28e2b72af37476989d729bd9591849ab895286f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
282919b98378d4de1938d20720931a8e95a490815f12dce80730e95ffc71ae8b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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