Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c3245a32ecebe631…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e457a08e5174026219b3aaa83dba9497 SHA-1: 64bb231101e097997e62d8183f5f0b871d2e5f7e SHA-256: c3245a32ecebe631654c0e52e5bb4821f6a34a9207b02c9527f4ce0b97612444
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample is an Office document containing VBA macros. Heuristics indicate the presence of VBA macros, a reference to PowerShell, and calls to GetObject and cmd.exe. The VBA code appears to be obfuscated and includes a Base64 decoding function, likely intended to download and execute a second-stage payload. The primary attack vector is the execution of malicious code through the VBA macro.

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
3fbef5b2f52b34d8ea269c5ded0ee934eadc41707491183ee9b76d730b3034b8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
044e13ac8fd964d740ae4a4e6cdfc5218c8f4ea6ccadcf604de64325f7a33e2f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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