Analysis
- max time kernel
144s - max time network
150s - platform
windows11-21h2_x64 - resource
win11-20231215-en - resource tags
- submitted
10/02/2024, 18:48
General
- Target Client-built.exe
- Size 348KB
- Sample240210-xf8rcsfc2v
- SHA256 a764ab21f9c2d5f150e7a664f8e7e6f28089a8ef0aaf891fc1fb5aa5d4ebf9ce
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
-
torbrowser-39837.portmap.host:39837
-
QSR_MUTEX_mKtX4dxnsu2wSaZtko
-
encryption_key
thraD5vGF6dBOg1osqaQ
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
200
-
startup_key
WindowsUserSupport
-
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 "WindowsUserSupport" /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 "WindowsUserSupport" /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/984-6-0x0000000005CE0000-0x0000000005CF2000-memory.dmp
memory/984-1-0x0000000000390000-0x00000000003EE000-memory.dmp
memory/984-3-0x0000000004EE0000-0x0000000004F72000-memory.dmp
memory/984-4-0x0000000004FC0000-0x0000000004FD0000-memory.dmp
memory/984-5-0x00000000050D0000-0x0000000005136000-memory.dmp
memory/984-0-0x00000000746F0000-0x0000000074EA1000-memory.dmp
memory/984-7-0x0000000006310000-0x000000000634C000-memory.dmp
memory/984-2-0x0000000005490000-0x0000000005A36000-memory.dmp
memory/984-15-0x00000000746F0000-0x0000000074EA1000-memory.dmp
memory/1588-14-0x00000000746F0000-0x0000000074EA1000-memory.dmp
memory/1588-16-0x0000000005530000-0x0000000005540000-memory.dmp
memory/1588-18-0x0000000006D70000-0x0000000006D7A000-memory.dmp
memory/1588-19-0x00000000746F0000-0x0000000074EA1000-memory.dmp
memory/1588-20-0x0000000005530000-0x0000000005540000-memory.dmp