Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b0bd5d6507b1bfb3…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2fccc80fa93f54eeb81e4069e36ad577 SHA-1: 0767ea5c050f65b1c3aed6e05343d3a0170ee00b SHA-256: b0bd5d6507b1bfb37c399c69fcfddf467bdca7ff8d0d1406cb90b55bac9925f0
160 Risk Score

Malware Insights

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

The OOXML file 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 a likely attempt to obfuscate and download a second-stage 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
dbd9bc27fedd8ac474acb9d53c44909348981305121a3f16484d56e5598c8246		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ce440d6f3d51007b3cd3afda9d3cf6db79d6210dd4e45bfa8493843fce8be969		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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