Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f737eba89b895aa0…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4ed572dee2616c31cfd83b843fe00650 SHA-1: 4f0151efcabc7df0c6a7c89c0a9d195b02d00670 SHA-256: f737eba89b895aa0a7c55db49d55248d312d22596c9222e2346fedecb0612412
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code itself appears to be heavily obfuscated, making it difficult to determine the exact payload, but the references to PowerShell and cmd.exe strongly indicate a downloader or initial execution stage.

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
4464b784376051062d56768e48ab8d24201a5ca7243b1b8fb41fa7493785264b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
4625abf4eb745176670ecc31f5bcb12b977f9b00f33627045ee086556756b5ee		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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