Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a75658083b7ec5c0…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f4a2ac557e1aadbebdad2d8060c83d13 SHA-1: 36f53c87c499e43a683b95e66e0a9ec6e345fc45 SHA-256: a75658083b7ec5c0439df89ce525caedd9e4bee244342f460feeea64625e2d36
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 leverage cmd.exe and PowerShell. The presence of a GetObject call and references to cmd.exe and PowerShell strongly suggest the macro is designed to download and execute a secondary payload. The Base64 decoding function indicates obfuscation is likely used to hide malicious commands or URLs.

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
6db897f92ddae39442bee09dbd1543b09892baa7be9492574bd56654b7aacfb8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
7c97b36b7110bdd25c6defd053ce0b478c1a9cf1a552e03e26ed3d35d061c50c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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