Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ea9157ad97170d2a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5b4d6595065b3b47091db6503f3f9b45 SHA-1: 32ab97ea91831ba786d5e1f01c0e3194f8381971 SHA-256: ea9157ad97170d2ae1fe135171c1114d29494cf34cdae8f7ee5c843aa4a03fae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The Excel document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and decoding routine within the VBA code indicates a deliberate attempt to conceal the malicious activity.

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
ef2b258a0a8631cf6d8b2b1125b5b67009f046cbef856500929ac095b2a92d9f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
3d4279ea7c221195867f639c598847b6c48fca2f246b1a1f6005cb01c681e740		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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