Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0232c300fabeaf24…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 878372317e88db253204d70a43d3c5d8 SHA-1: 26e30f2914121f2bd48791bcc9f4369830fb31f8 SHA-256: 0232c300fabeaf2423bf9cecacb8eeb97fc496606b73b9cfe9e9af274ce2dd4c
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the script is designed to execute external commands. The presence of 'GetObject' and 'cmd.exe' references further supports the execution of arbitrary commands. 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
a4dff711f5ba25445a4903cb22b341e8fc1002ed355eb9db4a8251d28b73fd3e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
11b4e8172c52f783a6d267225880d40e1a0831df237a036520c6e5bb1ddd5e6c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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