Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ada59dd43de1c2ac…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b130ad7a6adf0c0977372ffbf520be5f SHA-1: f490c1a0a2b70fdb5f0c35ae80e2a540ff7ad2f1 SHA-256: ada59dd43de1c2aca10545631d7a248a49e6270b1ebd822b3dc16fa3c2b565d0
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 OOXML document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The presence of a Base64 decoding function within the VBA code implies it's likely used to obfuscate and download a secondary payload. The GetObject call further supports the possibility of object instantiation for malicious purposes.

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
4c1a9054c2b6921fd276d645f4a0e2123ba74d6196ee7b261209b16f6f116fca		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
05ee8686a08d6d1de77dfd69e042270ca2c10b80568d659f2516ab476a642991		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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