Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e305c34866d7b230…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 33ae1b60bbe9047429a43ff486c9a226 SHA-1: 54081fffa91c81506147b0c38e198125edad9bb6 SHA-256: e305c34866d7b23042517cd12fbdee3895f03ec22fef9050c0b9b100d64cb697
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly implies a downloader or dropper functionality. The GetObject call is also a common technique for executing code within Office documents.

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
60d3d2e21fbb158a478061c0c587e8e857876d257d5516e140f4aec4e4ebd7ff		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
cdc39979457987ac81a3f4da8ea687ebcc296e8089e1002899fe9fdece1bbeac		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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