Analysis
- max time kernel
149s - max time network
155s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
28/05/2024, 23:12
General
- Target Client-built.exe
- Size 3.1MB
- Sample240528-26311shd68
- SHA256 add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754
Malware Config
Extracted
-
quasar
-
1.4.1
-
Runtime Broker
-
192.168.100.7:4449
-
25995a9e-6e08-4214-8fe6-1aa44dc5c1d2
-
encryption_key
B34E98F6CCC5FEAE5629334642BF27F516AF7D4F
-
install_name
Runtime Broker.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Runtime Broker
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 IoCs
- 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 6 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Runtime Broker.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Windows\system32\SubDir\Runtime Broker.exe"C:\Windows\system32\SubDir\Runtime Broker.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Runtime Broker.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Runtime Broker.exe
memory/1696-9-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp
memory/1696-11-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp
memory/1696-12-0x0000000002FC0000-0x0000000003010000-memory.dmp
memory/1696-13-0x000000001C310000-0x000000001C3C2000-memory.dmp
memory/1696-14-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp
memory/4496-0-0x00007FFCFA423000-0x00007FFCFA425000-memory.dmp
memory/4496-1-0x0000000000300000-0x0000000000624000-memory.dmp
memory/4496-2-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp
memory/4496-10-0x00007FFCFA420000-0x00007FFCFAEE1000-memory.dmp