Office (OOXML) malware analysis — malicious · 785ef80f03799964

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: 327c8c0e445a54efc6551ee1b2c69c6d SHA-1: e0bd8c7ffa4d20e00d764cc41882c8d4808ad766 SHA-256: 785ef80f03799964a0a541f33d870709a895978486ec1426fc5bacbcec41b095

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 OOXML document 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 script's functionality appears to be obfuscated, but the references to cmd.exe and PowerShell strongly indicate a downloader or initial execution stage for a more complex 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.

Filename	Kind	Source	Size
`macros.bas` `7bc4354a5dd4743e150bb18fa0f1f9804b25624fdd1c0639f452b9bd90a58a0e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35036 bytes
`vbaProject_00.bin` `e99dd40e935968eb63e494afc14e59fa892d08d8be6d535392943cc6ff37cecc`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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