Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ddc514c59e8e1582…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6da573368826b8419eb2b029e779880f SHA-1: 4d8c527cccdecfef595850dddb55216723e2ae66 SHA-256: ddc514c59e8e1582931ba8c91926cf7ee9bc4881a0f629524d7bd7ca81d75cae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute PowerShell commands. The 'GetObject' and 'cmd.exe' references further support the execution of external commands. While the VBA code is heavily obfuscated, its likely purpose is to download and execute a secondary payload, characteristic of a macro-based downloader.

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
c08d156d0fd1b1ae64cf11dd8468b1a0a67aa2f18f830051c6a236f894b762a9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
d295d52c2f5a79c3b89ea31fbbbe15f6b77695e99bf8da42e9cc5142b9bf8802		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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