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Remote Services: Remote Desktop Protocol

ID Name
T1021.001 Remote Desktop Protocol
T1021.002 SMB/Windows Admin Shares
T1021.003 Distributed Component Object Model
T1021.004 SSH
T1021.005 VNC
T1021.006 Windows Remote Management

Adversaries may use Valid Accounts to log into a computer using the Remote Desktop Protocol (RDP). The adversary may then perform actions as the logged-on user.

Remote desktop is a common feature in operating systems. It allows a user to log into an interactive session with a system desktop graphical user interface on a remote system. Microsoft refers to its implementation of the Remote Desktop Protocol (RDP) as Remote Desktop Services (RDS).[1]

Adversaries may connect to a remote system over RDP/RDS to expand access if the service is enabled and allows access to accounts with known credentials. Adversaries will likely use Credential Access techniques to acquire credentials to use with RDP. Adversaries may also use RDP in conjunction with the Accessibility Features technique for Persistence.[2]

ID: T1021.001
Sub-technique of:  T1021
ⓘ
Tactic: Lateral Movement
ⓘ
Platforms: Windows
ⓘ
System Requirements: RDP service enabled, account in the Remote Desktop Users group
ⓘ
Permissions Required: Remote Desktop Users, User
ⓘ
CAPEC ID: CAPEC-555
Contributors: Matthew Demaske, Adaptforward
Version: 1.0
Created: 11 February 2020
Last Modified: 25 February 2020
Provided by LAYER 8

Procedure Examples

ID Name Description
G0006 APT1

The APT1 group is known to have used RDP during operations.[3]
G0022 APT3

APT3 enables the Remote Desktop Protocol for persistence.[4] APT3 has also interacted with compromised systems to browse and copy files through RDP sessions.[5]
G0087 APT39

APT39 has been seen using RDP for lateral movement and persistence, in some cases employing the rdpwinst tool for mangement of multiple sessions.[6][7]
G0096 APT41

APT41 used RDP for lateral movement.[8][9]
G0001 Axiom

The Axiom group is known to have used RDP during operations.[10]
G0108 Blue Mockingbird

Blue Mockingbird has used Remote Desktop to log on to servers interactively and manually copy files to remote hosts.[11]
S0030 Carbanak

Carbanak enables concurrent Remote Desktop Protocol (RDP) sessions.[12]
G0114 Chimera

Chimera has used RDP to access targeted systems.[13]
G0080 Cobalt Group

Cobalt Group has used Remote Desktop Protocol to conduct lateral movement.[14]
S0154 Cobalt Strike

Cobalt Strike can start a VNC-based remote desktop server and tunnel the connection through the already established C2 channel.[15]
S0334 DarkComet

DarkComet can open an active screen of the victim’s machine and take control of the mouse and keyboard.[16]
G0074 Dragonfly 2.0

Dragonfly 2.0 moved laterally via RDP.[17][18]
G0051 FIN10

FIN10 has used RDP to move laterally to systems in the victim environment.[19]
G0037 FIN6

FIN6 used RDP to move laterally in victim networks.[20][21]
G0046 FIN7

FIN7 has used RDP to move laterally in victim environments.[22]
G0061 FIN8

FIN8 has used RDP for lateral movement.[23]
G0117 Fox Kitten

Fox Kitten has used RDP to log in and move laterally in the target environment.[24][25]
S0434 Imminent Monitor

Imminent Monitor has a module for performing remote desktop access.[26]
S0283 jRAT

jRAT can support RDP control.[27]
G0094 Kimsuky

Kimsuky has used RDP for direct remote point-and-click access.[28]
S0250 Koadic

Koadic can enable remote desktop on the victim's machine.[29]
G0032 Lazarus Group

Lazarus Group malware SierraCharlie uses RDP for propagation.[30][31]
G0065 Leviathan

Leviathan has targeted RDP credentials and used it to move through the victim environment.[32]

G0045 menuPass

menuPass has used RDP connections to move across the victim network.[33][34]
S0385 njRAT

njRAT has a module for performing remote desktop access.[35]
G0049 OilRig

OilRig has used Remote Desktop Protocol for lateral movement. The group has also used tunneling tools to tunnel RDP into the environment.[36][37][9]
G0040 Patchwork

Patchwork attempted to use RDP to move laterally.[38]
S0192 Pupy

Pupy can enable/disable RDP connection and can start a remote desktop session using a browser web socket client.[39]
S0583 Pysa

Pysa has laterally moved using RDP connections.[40]

S0262 QuasarRAT

QuasarRAT has a module for performing remote desktop access.[41][42]
S0379 Revenge RAT

Revenge RAT has a plugin to perform RDP access.[43]
S0461 SDBbot

SDBbot has the ability to use RDP to connect to victim's machines.[44]
S0382 ServHelper

ServHelper has commands for adding a remote desktop user and sending RDP traffic to the attacker through a reverse SSH tunnel.[45]
G0091 Silence

Silence has used RDP for lateral movement.[46]

G0088 TEMP.Veles

TEMP.Veles utilized RDP throughout an operation.[47]

G0102 Wizard Spider

Wizard Spider has used RDP for lateral movement.[48][49][50]
S0350 zwShell

zwShell has used RDP for lateral movement.[51]
S0412 ZxShell

ZxShell has remote desktop functionality.[52]

Mitigations

ID Mitigation Description
M1047 Audit

Audit the Remote Desktop Users group membership regularly. Remove unnecessary accounts and groups from Remote Desktop Users groups.
M1042 Disable or Remove Feature or Program

Disable the RDP service if it is unnecessary.
M1035 Limit Access to Resource Over Network

Use remote desktop gateways.
M1032 Multi-factor Authentication

Use multi-factor authentication for remote logins.[53]
M1030 Network Segmentation

Do not leave RDP accessible from the internet. Enable firewall rules to block RDP traffic between network security zones within a network.
M1028 Operating System Configuration

Change GPOs to define shorter timeouts sessions and maximum amount of time any single session can be active. Change GPOs to specify the maximum amount of time that a disconnected session stays active on the RD session host server.[54]
M1026 Privileged Account Management

Consider removing the local Administrators group from the list of groups allowed to log in through RDP.
M1018 User Account Management

Limit remote user permissions if remote access is necessary.

Detection

ID Data Source Data Component
DS0028 Logon Session Logon Session Creation
DS0029 Network Traffic Network Connection Creation
Network Traffic Flow
DS0009 Process Process Creation

Use of RDP may be legitimate, depending on the network environment and how it is used. Other factors, such as access patterns and activity that occurs after a remote login, may indicate suspicious or malicious behavior with RDP. Monitor for user accounts logged into systems they would not normally access or access patterns to multiple systems over a relatively short period of time.

References

  1. Microsoft. (n.d.). Remote Desktop Services. Retrieved June 1, 2016.
  2. Alperovitch, D. (2014, October 31). Malware-Free Intrusions. Retrieved November 4, 2014.
  3. FireEye Labs. (2014, May 20). The PLA and the 8:00am-5:00pm Work Day: FireEye Confirms DOJ’s Findings on APT1 Intrusion Activity. Retrieved November 4, 2014.
  4. valsmith. (2012, September 21). More on APTSim. Retrieved September 28, 2017.
  5. Glyer, C. (2018, April 14). @cglyer Status Update. Retrieved October 11, 2018.
  6. Hawley et al. (2019, January 29). APT39: An Iranian Cyber Espionage Group Focused on Personal Information. Retrieved February 19, 2019.
  7. Rusu, B. (2020, May 21). Iranian Chafer APT Targeted Air Transportation and Government in Kuwait and Saudi Arabia. Retrieved May 22, 2020.
  8. Fraser, N., et al. (2019, August 7). Double DragonAPT41, a dual espionage and cyber crime operation APT41. Retrieved September 23, 2019.
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  10. Novetta. (n.d.). Operation SMN: Axiom Threat Actor Group Report. Retrieved November 12, 2014.
  11. Lambert, T. (2020, May 7). Introducing Blue Mockingbird. Retrieved May 26, 2020.
  12. Bennett, J., Vengerik, B. (2017, June 12). Behind the CARBANAK Backdoor. Retrieved June 11, 2018.
  13. Cycraft. (2020, April 15). APT Group Chimera - APT Operation Skeleton key Targets Taiwan Semiconductor Vendors. Retrieved August 24, 2020.
  14. Matveeva, V. (2017, August 15). Secrets of Cobalt. Retrieved October 10, 2018.
  15. Strategic Cyber LLC. (2017, March 14). Cobalt Strike Manual. Retrieved May 24, 2017.
  16. Kujawa, A. (2018, March 27). You dirty RAT! Part 1: DarkComet. Retrieved November 6, 2018.
  17. US-CERT. (2018, March 16). Alert (TA18-074A): Russian Government Cyber Activity Targeting Energy and Other Critical Infrastructure Sectors. Retrieved June 6, 2018.
  18. US-CERT. (2017, October 20). Alert (TA17-293A): Advanced Persistent Threat Activity Targeting Energy and Other Critical Infrastructure Sectors. Retrieved November 2, 2017.
  19. FireEye iSIGHT Intelligence. (2017, June 16). FIN10: Anatomy of a Cyber Extortion Operation. Retrieved June 25, 2017.
  20. FireEye Threat Intelligence. (2016, April). Follow the Money: Dissecting the Operations of the Cyber Crime Group FIN6. Retrieved June 1, 2016.
  21. McKeague, B. et al. (2019, April 5). Pick-Six: Intercepting a FIN6 Intrusion, an Actor Recently Tied to Ryuk and LockerGoga Ransomware. Retrieved April 17, 2019.
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  27. Kamluk, V. & Gostev, A. (2016, February). Adwind - A Cross-Platform RAT. Retrieved April 23, 2019.
  1. ASERT team. (2018, December 5). STOLEN PENCIL Campaign Targets Academia. Retrieved February 5, 2019.
  2. Magius, J., et al. (2017, July 19). Koadic. Retrieved June 18, 2018.
  3. Novetta Threat Research Group. (2016, February 24). Operation Blockbuster: Unraveling the Long Thread of the Sony Attack. Retrieved February 25, 2016.
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  5. Plan, F., et al. (2019, March 4). APT40: Examining a China-Nexus Espionage Actor. Retrieved March 18, 2019.
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  8. Fidelis Cybersecurity. (2013, June 28). Fidelis Threat Advisory #1009: "njRAT" Uncovered. Retrieved June 4, 2019.
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  12. Nicolas Verdier. (n.d.). Retrieved January 29, 2018.
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  14. MaxXor. (n.d.). QuasarRAT. Retrieved July 10, 2018.
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