Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c1da36a1ee718ace…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 60b1d4d2e6d8ecd0cb351782a0cec883 SHA-1: 8a5a9f80f0d9103cf64474c8d23be7a6c9bcc947 SHA-256: c1da36a1ee718ace5726d18b2773ee29ffe9c162a2d495e254a00b7cb9ece0d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating it is likely preparing to download and execute a secondary payload.

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
780a7566003f14eb492cf56c796ddf2bb7411d357a5a298dcbd9c69bb74f0bf4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5b00ab9969d8ebf2228f6b77a968e5c9d685a69ef9f2385a2393c76691074cce		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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