Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b2026b947c47b5eb…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a48dc6756db4b4aad2347c6d237420a3 SHA-1: 14e86c0124eec0f69af0adfaa3035a96a9002fdb SHA-256: b2026b947c47b5eb5e190018ddb16aa84e0600e64484f869843158d433b073de
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

This Excel document contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscation, likely to hide a payload download URL or execution command. The GetObject call further supports the execution of external code.

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
329c88d6bccb88ad4b7b9cd46be15eef4f00439c8c02b140ab85fe78f83a3594		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c9a251b863a01c7b4547a9e2e0fd99dcd2df37c5a38971dad0491cc8510b15b4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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