Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b5c4f9c6acf47007…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bd8daac9572aecbaa211f5066597ad27 SHA-1: b33503ae1bb42df9c1286f680b536d1bab6312f3 SHA-256: b5c4f9c6acf47007a9f7b8985910eaa601e34d0822f10a0f09c20bb98f22bd16
160 Risk Score

Malware Insights

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

The VBA macros within this Excel document contain references to cmd.exe and PowerShell, indicating an attempt to execute commands on the host system. The presence of a GetObject call further suggests the potential for object manipulation or execution of external code. These actions are consistent with a macro-based downloader attempting to retrieve and execute a secondary 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
5face4eb2c7a7e9595370188765677f7e00b9898556e84357f8b4dee82901188		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
3b47fd32f1d722e4de65de196b5580a45084946e324df2d63aa75703792bad3d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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