Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1612fff7d91fdef4…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a182e89888393e615d6ec9d46412fdf7 SHA-1: b121d4eefd705269596a90476832b7cf335ee935 SHA-256: 1612fff7d91fdef4a0d08dd4ed94d23bddbcff1323524098578869fc5dd5a312
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 cmd.exe and PowerShell. The presence of GetObject and PowerShell references suggests the macro is designed to download and execute a secondary payload. The obfuscated VBA code, including Base64 decoding functions, further supports this assessment. The file is classified as malicious, and the techniques observed are consistent with a macro-based downloader.

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
67aae0ad0d2574692b296207316f22b69680e3efde5b47a8ef57a1f8b323b493		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2444fc2f50c9c9b7a97e38d84fb79ca0a0c48fd4a82d0b215c014e0ae42d0b10		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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