Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9d840e47ace8af97…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 02f662da43e4485e5f26ceafd0970be2 SHA-1: e8085a2dde4a74d73e85df0bff7787ba85c5a9ff SHA-256: 9d840e47ace8af97d5b73b88a362a09d1d63b16b85eab213ac19c3200933c3ca
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The presence of these commands suggests the macros are designed to execute arbitrary code, likely to download and run a secondary payload. The GetObject call further indicates potential for object manipulation or execution of external components. The Base64 decoding function is heavily obfuscated, making it difficult to determine the exact payload.

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
65fe84dfb315e5bc8f682473924207944e3560e4697c731cbabddb07fb07b686		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
0281aed88f301c775d9faed09e775ddc524fb3025c1fd2e5c17c8964493e7538		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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