Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c85ea5cf39f82e9e…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 34091b8121bb91f3e81270c43e704f4a SHA-1: 146726940def291d4cb0611a259bb20853af0b7d SHA-256: c85ea5cf39f82e9e9da4e0348c6beb4d3a7ed70a9a974312e708a709580199f8
160 Risk Score

Malware Insights

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

The sample is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be obfuscated, but its likely intent is to download and execute a second-stage payload. The presence of these indicators strongly suggests a malicious macro-based document.

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
fdd5ee8a99486062637ead573265797bf21cdf4174d59b986ba2dd2847487e68		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
568260aaa719f27aecc34b1459eecae2d72ae27459df8f30fc9b2a8175356660		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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