LDAPFragger : Command And Control Tool That Enables Attackers To Route Cobalt Strike Beacon Data

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LDAPFragger is a Command and Control tool that enables attackers to route Cobalt Strike beacon data over LDAP using user attributes.

For background information, read the release blog: http://blog.fox-it.com/2020/03/19/ldapfragger-command-and-control-over-ldap-attributes

Dependencies and installation

  • Compiled with .NET 4.0, but may work with older and newer .NET frameworks as well

Usage

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Fox-IT – Rindert Kramer
Usage:
–cshost: IP address or hostname of the Cobalt Strike instance
–csport: Port of the external C2 interface on the Cobalt Strike server
-u: Username to connect to Active Directory
-p: Password to connect to Active Directory
-d: FQDN of the Active Directory domain
–ldaps: Use LDAPS instead of LDAP
-v: Verbose output
-h: Display this message
If no AD credentials are provided, integrated AD authentication will be used.

Example usage

From network segment A, run

LDAPFragger –cshost –csport
LDAPFragger –cshost –csport -u -p -d

From network segment B, run

LDAPFragger
LDAPFragger -u -p -d

LDAPS can be used with the --LDAPS flag, however, regular LDAP traffic is encrypted as well. Please do note that the default Cobalt Strike payload will get caught by most AVs.

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