Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4f8dd2621425e08f…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 316c201add45d804333ed22ceaa7ab3e SHA-1: 4e4e881872b9127096de5d76ce48661eb1053214 SHA-256: 4f8dd2621425e08f041d5280a8f4f8870c9785bd51b224df41e627134eb17a25
160 Risk Score

Malware Insights

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

This Excel document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code itself appears to be heavily obfuscated, but its intent is likely to download and execute a secondary payload. The Base64 decoding function hints at further obfuscation of 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
3c25a07fccb13e3182b2a9a7603f094711d79f831b30fb37771a5aa78c72271b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
83dc4d5f3e25b9b417ac23c809771f0246c35e46308e971b75561d3b00d6c67d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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