Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b1caf08eddc75770…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9bd5b90bf23fe0a36a66643dae73d30a SHA-1: eec1a421d608d3fc02eabc000fc7febe9eaa4d90 SHA-256: b1caf08eddc7577012bf35ea5b9d08af33c22b8ae22fcfa5ee79fc51c1a91268
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary code. The presence of a 'GetObject' call further suggests the potential for object manipulation or execution of external components. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern points to a downloader or initial execution stage.

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
2f33314a3b6c419e4f10e41179efd7d13fcf6aff6f8cb1b3a087d6556a70bd18		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
862c3e4d3c2ffad5ca6a1d5bdb6fe76ad59efedc20e6b780188bd130a41c840a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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