Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f48ce995f1cc3006…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9741fd0a2e041107491c53267e128593 SHA-1: ea751237a4c68ac013d65b1667fa62ac736d42cc SHA-256: f48ce995f1cc30064099d412fa98c86a2cc1a9b95afb00d95ec7ea7146f07a79
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 Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code appears to be obfuscated and includes a Base64 decoding function, suggesting it is used to download and execute a second-stage payload. The specific family is not identifiable from the provided evidence.

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
50839d375e6edb944b945a329d4fabc750a68fd087e7e4a53cb7816646f0c38f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
f8e615c3d4b14454639242c65d73e242f5db918f5e2ebec9cdc50d0f3cc740fa		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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