Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e17671967019893e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 75dd14dbdaa8aa3d2426ab81b96715b2 SHA-1: 28b0907576ec7a13ad28c16204523d5025353a58 SHA-256: e17671967019893e0961191c2a0eb6db6a1eafdc5745e8541cd0c3f295e25887
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the macros reference PowerShell and cmd.exe, and utilize GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests it's designed to download and execute a second-stage payload. The specific family is not identifiable from the provided evidence.

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
e8e1ad0ec42f31ccfb07e007614dbf9b0e87f27c5ab649f82e4b262dcbaedd0b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
6c8d2b06819c70bc42aed1b22cf6e6b0510aeb8e85731b99608431cef1ac11fb		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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