Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c84e953bf9058bbf…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3447038d1333ec2d86e36723cf3ff1d8 SHA-1: 0e5e1f431a5006e00a5d37abda1ca22d9cb9416f SHA-256: c84e953bf9058bbfe926bec6e54aad641502f4dec815a86cf22a6dffe1391275
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 file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself appears to be heavily obfuscated, but its likely purpose is to execute a PowerShell command. This command is expected to download and execute a second-stage payload, a common technique for malware delivery.

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
88c65c8d23a04eee404f7315d355a2cac3fdab8d6453c33b931f857639c6b033		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
47be732f86d44068ece01e08cd8ab6735ec4db30ab976d2c107c5b8c353c2e56		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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