Analysis
- max time kernel
143s - max time network
153s - platform
windows10-1703_x64 - resource
win10-20240221-en - resource tags
- submitted
02/03/2024, 20:17
General
- Target Client-built.exe
- Size 348KB
- Sample240302-y222dahe22
- SHA256 962f5a44ad1a7fe0781c01c461abba727d835da9a35b01b9e507c0538a58ac67
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
-
E7Team-54210.portmap.host:54210
-
QSR_MUTEX_sCp3fGDikoygyZjv1p
-
encryption_key
MBC9SuMUPOlaVvtBf63w
-
install_name
SystemConfig.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
WindowsClient.exe
-
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
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "WindowsClient.exe" /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\SystemConfig.exe"C:\Users\Admin\AppData\Roaming\SubDir\SystemConfig.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 "WindowsClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SystemConfig.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
SystemConfig.exe
memory/4184-20-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
memory/4184-19-0x0000000073F20000-0x000000007460E000-memory.dmp
memory/4184-18-0x0000000006160000-0x000000000616A000-memory.dmp
memory/4184-16-0x0000000004AD0000-0x0000000004AE0000-memory.dmp
memory/4184-15-0x0000000073F20000-0x000000007460E000-memory.dmp
memory/4240-3-0x00000000053C0000-0x0000000005452000-memory.dmp
memory/4240-7-0x0000000006510000-0x000000000654E000-memory.dmp
memory/4240-6-0x0000000006120000-0x0000000006132000-memory.dmp
memory/4240-5-0x0000000005570000-0x00000000055D6000-memory.dmp
memory/4240-14-0x0000000073F20000-0x000000007460E000-memory.dmp
memory/4240-4-0x00000000055E0000-0x00000000055F0000-memory.dmp
memory/4240-1-0x0000000073F20000-0x000000007460E000-memory.dmp
memory/4240-2-0x0000000005970000-0x0000000005E6E000-memory.dmp
memory/4240-0-0x0000000000B00000-0x0000000000B5E000-memory.dmp