Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 54c239d8a8201953…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 80773f30f8cdf10f059c904aa2100539 SHA-1: 5077aac4c7c287362a58a497773060aa8d4f6981 SHA-256: 54c239d8a8201953df7385344ace3bab4fb3961a86490d5b424f7b711e2e28a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators strongly suggests it's designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

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
d5b9241e28b66a0cc5336ea8ea09192ae6e19385b8a170e05a4d27c55f477d5e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
02179fe5267cb28088a4cdbee70087c52c6d4c6cd3f78c5848f74a4884f04b8f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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