Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a86e39d2290a1363…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 283fc6a9713a6bc325e4711ce740d737 SHA-1: c18b54d6f7795b3ab969ea7d3c0f5fe950132166 SHA-256: a86e39d2290a1363e313ca0234c76fbf62bb50406340126cb5a985634e9b3135
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The 'GetObject' call further suggests dynamic execution. These combined findings strongly imply the VBA code is designed to launch external commands, most likely to download and execute a secondary malicious payload. The presence of a VBA project confirms macro-based execution.

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
c8bd71906c62b65412985fcd7ecfc811c32000ec99bde0d934c2933ffe0df316		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
468d810eef023f4d7ddf345f1f12254e74491c19a060d2f487054acc693ca998		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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