Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 25f7fe676258c471…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a1ec0657fc20bb89bafa35945c4e05f2 SHA-1: c8423dfcd845c19bce60eea4d5c48a5dc8aeeef3 SHA-256: 25f7fe676258c4711ca7b06a0d9f68aa4bcafb09249671ff910bd8ea99e69738
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

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
1fc3e1cd3aea6070ee23c44f557462e2096e4efef7ef07c13537cd7784a6d6d7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
e5a34832cfcaf22b7fa066eaf8b24c1e3660bdc5b8ce6c5db1cc7ee110e5ef17		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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