Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 734cfebca29329c4…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0a7cb2b4eae0f9abba1e82212ecd9173 SHA-1: bf5bc12b72c457c125a0e01d86c82b6334655315 SHA-256: 734cfebca29329c49029c594210add6daafa5922a265d90cfcd456b104893c95
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 critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros. Additionally, 'OLE_VBA_CMD' and 'OLE_VBA_GETOBJ' suggest the use of cmd.exe and GetObject, common for executing downloaded payloads. The presence of a VBA project confirms macro execution is intended. The Decode64 function is likely used to obfuscate a payload or URL.

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
87ca6f13f435181f4f8e055c99bb6da3de5987f3f22e8734b06c4ecfb3d4e2fa		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
ced1c3a9e0b97b38024923ad21b8741c9212889e899270424f75c372700d9959		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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