Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4869f5ceea2b6ddb…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c4d2cc8bde3e133e95fd0c099475af32 SHA-1: 9e67ec05622a550c12569199dfe99ef1369110e8 SHA-256: 4869f5ceea2b6ddb3c0bfbd75d16d4f5870ecfd8f477544766eae26ffb8b6691
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 VBA macros suggest an attempt to execute arbitrary code. The Decode64 function indicates potential obfuscation, likely to download and execute a secondary payload. The specific obfuscation and execution methods point towards a macro-based downloader.

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
b38634fea2885e1124c85545865469da9bdbaec35eb5225dc6be174c2160d423		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
50f1b6ced58cabda67321f5233627d0e3ddb97e0a52202405f989595bce8a39d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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