Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2c31974ac0a569e6…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 81bf9aa92ee15e2f986b9153f95a2879 SHA-1: 9da04d03951427c2b048df5a23e334574e087230 SHA-256: 2c31974ac0a569e61e8d6570a6f41601d43d39d94754a638f0f32dbc7175dda9
160 Risk Score

Malware Insights

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

This Excel document contains VBA macros that reference PowerShell and cmd.exe. The macros also contain obfuscated code, including a Base64 decoding function, suggesting an attempt to hide malicious activity. The presence of these elements strongly indicates that the document is designed to download and execute a secondary payload, a common tactic for malware delivery.

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
5ba0d2d870af7c0b1a6b7df248e89f5e37abfca7e252d2b5723ef9666d49735f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
34287c5b0bb815a9909004d8781d4a6b59168663cb650e70761fe9d01940a5e7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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