Analysis
- max time kernel
277s - max time network
294s - platform
windows11-21h2_x64 - resource
win11-20240508-en - resource tags
- submitted
02/06/2024, 18:08
General
- Target Client-built.exe
- Size 348KB
- Sample240602-wrdjxsbb73
- SHA256 45259ac5a1fd635f5b2a41492f4156cc8476afd8e8764a9d61d3158599a75fd8
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Client
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runderscore00-61208.portmap.host:61208
-
QSR_MUTEX_UyCo16EyzQLUNZiVH0
-
encryption_key
AaATXyVYZ9AKtrWxhyCz
-
install_name
Client.exe
-
log_directory
Keylogs
-
reconnect_delay
3000
-
startup_key
Powershell
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/2228-19-0x0000000074920000-0x00000000750D1000-memory.dmp
memory/2228-18-0x00000000065F0000-0x00000000065FA000-memory.dmp
memory/2228-16-0x0000000074920000-0x00000000750D1000-memory.dmp
memory/2228-14-0x0000000074920000-0x00000000750D1000-memory.dmp
memory/4500-3-0x0000000005420000-0x00000000054B2000-memory.dmp
memory/4500-6-0x00000000060C0000-0x00000000060D2000-memory.dmp
memory/4500-7-0x00000000065F0000-0x000000000662C000-memory.dmp
memory/4500-5-0x00000000054C0000-0x0000000005526000-memory.dmp
memory/4500-4-0x0000000074920000-0x00000000750D1000-memory.dmp
memory/4500-15-0x0000000074920000-0x00000000750D1000-memory.dmp
memory/4500-0-0x000000007492E000-0x000000007492F000-memory.dmp
memory/4500-2-0x00000000059D0000-0x0000000005F76000-memory.dmp
memory/4500-1-0x0000000000880000-0x00000000008DE000-memory.dmp