Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b1df9f58cbca882a…

MALICIOUS

Office (OOXML)

44.6 KB Created: 2021-06-24 04:31:25 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7d279366cfef12d6750dcdda0cca7f4e SHA-1: 9f669b9268e740634c33571a520ae275935dcd9a SHA-256: b1df9f58cbca882a6d3dd84e17b835e275c28a108d2d741cf5472ff84638dc62
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 indicators 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
a7156e0307956b5c749057414ce35a1c36152f06a4d7904488bdf2a44539fc34		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 30778 bytes
vbaProject_00.bin
f8ca0bd65e66c1e770ab7443d5a3d0701f5c53ce14c0f9dfb211f201059bc0d1		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

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