Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f8453cdeed122fbd…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3fc700af1d6b0db34dc8cc11043f5c16 SHA-1: c980ad7ed0d8c2824c58ebfd9dcd83e6e66ab1c1 SHA-256: f8453cdeed122fbd8ce4f289094fe34dee078edfff1b604ff9e336b76f39b3be
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 file is an Office document containing VBA macros. Heuristics indicate references to PowerShell and cmd.exe within the VBA code, suggesting an attempt to execute external commands. The presence of a Decode64 function and truncated obfuscated code implies the macro is 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
3ed48963541207f42e207fc9bc13279302e211228b2555774986dc83fc22f88f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
76b0bf1ad89fd1416cb419f648149f99f69b577de9fd8d0a6de8a849d4794819		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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