Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 575ff99e0db8b8ca…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b9301e2659efe9fc0ad4800f3326c0b5 SHA-1: e359424c9aa7356937640cb8ed368b364bda21f5 SHA-256: 575ff99e0db8b8ca38264c1526cfa6e05864667398c8a063340b44f4989b3f07
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 contains VBA macros that reference cmd.exe and PowerShell, indicating an attempt to execute commands on the host system. The GetObject call and the presence of a VBA project strongly suggest malicious intent, likely to download and execute a secondary payload. The Decode64 function suggests obfuscated code is being used.

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
b0facbeb516d765d0ec54569c8b75583b7be9cd234cee34da5b9ff301192261f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ae0bc4405ac0f486db674570f054e6aa05de2638128c7de14d02fe7fcf53dbac		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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