Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94d6b04d8e609cb8…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4e74c2685da5d0c6d79938de0afee859 SHA-1: e8a3d733598cc1a34430b00ad8147fd24917a923 SHA-256: 94d6b04d8e609cb8b88e968ca07114aeb5cea136a6a7b2c1e65bfef85b50695f
160 Risk Score

Malware Insights

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

The sample is an Office document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The presence of a Base64 decoding function within the VBA code further supports the hypothesis that it is a downloader for a second-stage payload. The specific family is not identifiable from the provided evidence.

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
596e4b755cfc8f79975963f4c172c77e4b3a8009a9d2bce0ba7971fdeb77ad65		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
160a6d1904950eb08f21dbab8cd010e1576fed9bc22db41d399222f119d1a0d8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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