Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 60d22612a4b3c311…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bc45781e687ec82b6f5039b8f9956f51 SHA-1: 024a94c4bc15f274bab16ac3ebe05e19a517a445 SHA-256: 60d22612a4b3c311482813a18dcf5145ce7467a6e8121ef0ebf3c38814a85269
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project indicate that the macros are intended to be executed. The script's functionality appears to involve decoding a Base64 string, which is likely part of a payload delivery mechanism. The primary purpose seems to be downloading and executing a secondary malicious component.

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
7e8a7ca42389dd54bb74b36bb2c683fdfd07f719b2ec13eff13ed1ca139238bf		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
caa08d1ecaa33da4fad56663978ef2d3933315c223c902f135fadbededd11eb9		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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