Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 80fa624b179b5c35…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 82d1e5b9e411320bc52f88033ef19c0e SHA-1: 2047bcb80153765f7c6b3fa1c57b34ce74af1221 SHA-256: 80fa624b179b5c35d6915991225f68a082e5b43f3ab9c450dc07a67301a945f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The Excel document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a malicious payload. The specific payload and its destination are not directly visible due to obfuscation and truncation.

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
e35c0f7bdabe33dc02daab2d96e1d67eaee2a7b6d43474f5ee5de4e4491aa7a2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
53511730b742cbaa1c4a54aabacae16a0be96de02e2af3791a7440ef17379002		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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