Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e0ab9032678bccf5…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9b6ac663f8749c5d2c8b6e71a8088077 SHA-1: 490ad7c74fefd6818e5befeec00549362bb34747 SHA-256: e0ab9032678bccf55d263ee679369972679bafb0150bd6601413870be3fb702b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code includes a Base64 decoding function, indicating obfuscation, and the overall structure points to a downloader or initial execution stage for a more complex attack.

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
7d08c927ae2881999d3db93bb438404991c982ed3295904ae7f89079e502333e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
1b444f210a9b291742e714f8f165eb92193f4002af1a66ccae948479c54f7946		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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