Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 159fae34096ffd48…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 260ac221de564b68ba9fd2680554fd82 SHA-1: 34f11d00d75b3b86d0152b4772baa152d6ef6710 SHA-256: 159fae34096ffd481f5ebdc9173d22fafb531d11a07bd91d99236933db48e405
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, and the 'GetObject' call suggests an attempt to load and execute external code. The VBA code itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest a downloader or dropper functionality.

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
952dd05faab03e5cd820a8076a10def8df40e5296afb514d615cdd35b46e37c0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c22fa41b46965f51a2092c041ea6e6d2e88f65357a5fe0cec39f7c0bd69e0e19		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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