Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f2bb14abb6b8e37b…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f40e6f03b9dfa26455ae3c92855bd15b SHA-1: 96785cec3e78b34014fe07954e498d50d3e4584d SHA-256: f2bb14abb6b8e37bd0816cbd33800275aaef042416e737f45037b6dc35899c95
160 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code appears to be obfuscated and includes a Base64 decoding function, suggesting it's designed to download and execute a secondary payload. The primary technique observed is the use of Visual Basic for Application macros to execute commands.

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
5934df6917cb68bb25efaa3e858bd4e625ac5924e700798573828c5d964717ae		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
30a5dd3888772dd268a3a3c3f234bc8bfbee5be1fe6a5e2767d8320006a82856		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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