Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 08ee73b71ec9d4ee…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3829b9ec3c6f094cce6ad6952ad05f1d SHA-1: c57b2336fd020d9b2f2c6e2b32eb8c1ee239dd7f SHA-256: 08ee73b71ec9d4ee32a2e983378d4f1f6f99a46f3297e58c4d08a9150d775852
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs prevent a more precise 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
acbb74d20a165149cef4b9f62ade8ed1acc1f7d3803cfc2674447f9a08f08e0e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7038258188f52c47b43296a6b2c88fbbcc8dda63c412a635bcde8c3e64b46c9f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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