Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8efcde731f77596c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c948c89868e297bdc68c7caaa9936196 SHA-1: d82f1ec7af87d31fc5857cdd0e3149171afd90e3 SHA-256: 8efcde731f77596c3389f348ec0838ffa61aaa475820e0d770b2daf249aedf47
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code includes a Base64 decoding function, suggesting it is used to obfuscate malicious content. The likely intent is to download and execute a second-stage payload.

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
bdbe0bdf940118652c47a90a96e446036d5602e7a0e685b3b72e060568e1329b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
96669ac5b1aa61208414e336cf258bcc0380561784a50098e7d636681008d35d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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