Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94d3db1029027c0f…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4d7849e5c0de8b57572f56a4950489d1 SHA-1: de73e91d56eda74c3772199b5a7cca110d438c6d SHA-256: 94d3db1029027c0f88442ee1e6e344f31b91cfd30db3c4854496c28cac2ac02b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests malicious activity. The VBA code appears to be heavily obfuscated, but its intent is likely to download and execute a second-stage payload, which is a common technique for malware distribution.

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
af0a373da5e1be2af05277461c50cd4dc35744005749534ce3d4c651348dd158		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
a73592710067d6f8232df73a961b7a87246acf32d6b436ab0bb6e4cd909b1d3b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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