Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fdf90b0c8d2a0d28…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8c4f537fc258ca93a2eaf274f58db456 SHA-1: 9fb764f6b23c0026aafa5bbd14a5c352557c01f4 SHA-256: fdf90b0c8d2a0d2889e2e972e42f618ca91163732aa43bb00f8103443923a47d
160 Risk Score

Malware Insights

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

The Excel document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

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
b0697244eec9b7b56ff2304fe423ae3fc3e68a5c7d5b5273eba36bd76527a343		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cb5e68aa5ee9bf9ee6da3ef4f6be733293c549cb6c17f54c79b8c128952df4e8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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