Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5e2cbb8cb169f027…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 143f5cc8c1e73cae8b55869c86b6e1db SHA-1: d18eed4fa9d7e65bb35c403a29ec4bee86593c35 SHA-256: 5e2cbb8cb169f027695697ea9869456d0f07d67e0cfb2f65c931b77eff65aec6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an OOXML document containing VBA macros. Critical and high severity heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests an attempt to download and execute a secondary payload. The GetObject call further supports the execution of external code.

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
dd488b7ee6297ca2c5583434338b1fc8ad5e9b6dfe022f02c03d82dceb36f86e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
af75f9c0c90e94e7714587b0c728b8f30b70e866e75b61360659ea97b5785343		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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