Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0204c90537953a0b…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 685d7c3394efb34e30aa3a5525f6ae60 SHA-1: 112ae4f458266356656dab7e0c372c540c97fc92 SHA-256: 0204c90537953a0bc5ef3c6e33b00640c78430ac9735ab75dbf933eb39abcca8
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 VBA code includes a Base64 decoding function, which is often used to obfuscate malicious payloads. The primary function of the script appears to be downloading and executing a second-stage 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
abeed8ac62e31481c4018ee37c74199ef4503901b89aea1ffd87567083db9973		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
33d2f3638b915ebfd1953cb6299acfe8c3baced6caa3cd9cebec517fa81285d4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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