Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b058472828a553de…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 50b9bb479df6febc1837e75743129381 SHA-1: 013c294caf285ec1a06693f0f2d094e95e574e5f SHA-256: b058472828a553de04a64da21272337b61c1b6fba5be2893d3c5b24cffcffa77
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 these commands suggest the macro is designed to download and execute a second-stage payload. The Base64 decoding function present in the script further supports the idea of obfuscated malicious code being executed.

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
638e1984f725b965df060105a5b9519402f93e3fa9a7dca55b9cfba0d3099cb2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
1cf25e54e1e42f4e9fdebf00f56574b35d7fce91146358e6f10e3cb7a52dd06b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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