Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 096daa8e5a75ba2b…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d0bbf3a3ec46b76a117188d4d4d0a8a0 SHA-1: 1cb663e544c9ec321c5ebe16e2afceff13f8bc03 SHA-256: 096daa8e5a75ba2b7c66b20c14208e7b0225060939e36c4102852e7090f7bf65
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute malicious code. The presence of a GetObject call further suggests the execution of external code. The VBA macro itself appears to be a Base64 decoder, likely used to obfuscate a payload that is subsequently executed.

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
f5ffbaf710a9b93e49573069afd73bbedf3b7a93764f599ae685294aa6ff8865		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
132ec0efbeb6e742a3ba173efdb04efb4657f1bea586429391bd8879ec4174a1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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