Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d836064a5bff6b49…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8b664cccb696d0b874c901538006616b SHA-1: 91296cd0dbeffb792ae31fd235742651b0b0d5b9 SHA-256: d836064a5bff6b4977fa50a070ae4087da0683fd2c2565e93f9ee0f32aa96907
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic for a PowerShell reference in VBA, along with high-confidence heuristics for cmd.exe and GetObject calls, strongly suggests the macros are designed to execute arbitrary commands. The presence of a VBA macro and the associated file names indicate a macro-based attack, likely for downloading and executing 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
dd077c76ad583a29c0fb142e339f714ea7c713b474983522af3e6d597b52f50f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
12f380acf8df6758aa143ea853f73aec97bad32721bdd5c1f5c58a11327ceb33		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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