Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
04/04/2024, 17:21
General
- Target Client-built.exe
- Size 3.1MB
- Sample240404-vw593add7w
- SHA256 4dbe62432c0ef53118b9efc6cb36ea70d0050091ceb592cb6da8176f44e25f76
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
149.0.133.66:4782
-
cd138a2a-7444-407f-82fe-708b26f61ab0
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encryption_key
7F14A750B3F8A6840A227085ABF4277450589609
-
install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Update
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.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\SYSTEM32\schtasks.exe"schtasks" /create /tn "Update" /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/668-0-0x0000000000270000-0x0000000000598000-memory.dmp
memory/668-1-0x00007FFCA6400000-0x00007FFCA6EC1000-memory.dmp
memory/668-2-0x000000001B1F0000-0x000000001B200000-memory.dmp
memory/668-9-0x00007FFCA6400000-0x00007FFCA6EC1000-memory.dmp
memory/2172-10-0x00007FFCA6400000-0x00007FFCA6EC1000-memory.dmp
memory/2172-11-0x000000001AF90000-0x000000001AFA0000-memory.dmp
memory/2172-12-0x000000001B6E0000-0x000000001B730000-memory.dmp
memory/2172-13-0x000000001B7F0000-0x000000001B8A2000-memory.dmp
memory/2172-14-0x00007FFCA6400000-0x00007FFCA6EC1000-memory.dmp