Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b2c9361b8311adf9…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 38b64dd6f864a46446a0288968cc5b1f SHA-1: 2e7fe461a133cb6f7059a238c5ba09ed211b9d8d SHA-256: b2c9361b8311adf9f850c7ea0afaa39fd1075d38c3049f3cf0eab021bb231686
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 cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The GetObject call further supports the possibility of object instantiation for malicious purposes. The primary function of the VBA script appears to be the execution of external commands, likely for downloading and running a secondary payload.

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
2042345ab3f07c8273d9c816ef821e512dc87ea6f607103a4a3b1a75613a9bd9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
9f6bbd5987d721940c6128fd9d38225618aedfcc7df60b5cd02110c761b075e4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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