Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 07aae10e4bb2806c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: fe6d2b947e7c664c1cb89de68dbfc7a1 SHA-1: bb30802e65817de48632269689465d25a0e6ce4f SHA-256: 07aae10e4bb2806cc0d789e08732d30435309085075bba78efa2b817f2e04e7f
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The presence of a GetObject call further suggests the execution of external code. The VBA code includes a Base64 decoding function, indicating that malicious content is likely obfuscated within the script and then executed. This pattern is typical of macro-based downloaders.

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
adb80ce7b01b1aa6e31d1d4da9e59820a28be88dae8e67a6b200ee75b7d85ffc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
fec93906c0ba94c271514c77ffb8a4981b31660aba5db16a3b20e7dd2ab88d50		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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