Analysis
- max time kernel
148s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20240709-en - resource tags
- submitted
24/07/2024, 18:41
General
- Target BuiltSub.exe
- Size 3.1MB
- Sample240724-xbsvcathkd
- SHA256 f3bbdd5a2cc7e3e237f479c1fda8763b93cd5258531ae5c132b7aed4bdfe8385
Malware Config
Extracted
-
quasar
-
1.4.1
-
Subeer
-
192.168.197.45:4782
-
ad8dba7f-06db-4d0a-9afc-74dfd02d5347
-
encryption_key
B31DD910CCE569E87A1C1C1F365FCA4C48E5D4AE
-
install_name
Roblox.exe
-
log_directory
Logs
-
reconnect_delay
500
-
startup_key
CefSharp.BrowserSubprocess
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 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 FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 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\BuiltSub.exe"C:\Users\Admin\AppData\Local\Temp\BuiltSub.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "CefSharp.BrowserSubprocess" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe"C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "CefSharp.BrowserSubprocess" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Roblox.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Roblox.exe
memory/2532-9-0x00007FF921A70000-0x00007FF922531000-memory.dmp
memory/2532-10-0x00007FF921A70000-0x00007FF922531000-memory.dmp
memory/2532-11-0x000000001BF00000-0x000000001BF50000-memory.dmp
memory/2532-12-0x000000001C010000-0x000000001C0C2000-memory.dmp
memory/2532-14-0x00007FF921A70000-0x00007FF922531000-memory.dmp
memory/4204-0-0x00007FF921A73000-0x00007FF921A75000-memory.dmp
memory/4204-1-0x0000000000C60000-0x0000000000F84000-memory.dmp
memory/4204-2-0x00007FF921A70000-0x00007FF922531000-memory.dmp
memory/4204-13-0x00007FF921A70000-0x00007FF922531000-memory.dmp