Analysis
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max time kernel
27s -
max time network
20s -
platform
windows11-21h2_x64 -
resource
win11-20240412-en -
resource tags
arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system -
submitted
19-04-2024 22:35
General
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Target
Client-builttttt.exe
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Size
3.1MB
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MD5
6008b1f40ce25519bacd9a12f89755df
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SHA1
e38e22911d1baebae439caf4d5556143927e3a02
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SHA256
33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7
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SHA512
133aea39eb9617aa968c33add336304a1b1796ba1945db7ad7b6748d3463e77dbb405ff3755f4dc1f6d3de37eec870d9b01c3dcbaa0ff399f02e86174ec5a2ce
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SSDEEP
49152:Sv/I22SsaNYfdPBldt698dBcjHghGmvBToGduNTHHB72eh2NT:SvQ22SsaNYfdPBldt6+dBcjHghGmv5e
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.139:4782
127.0.0.1:4782
e12e9d8f-f86f-4c20-aaa9-ca4ae3df9435
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encryption_key
8A5C503C69142D8C1F9A30FB7AA52FB2729B3861
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral1/memory/1440-0-0x0000000000060000-0x0000000000384000-memory.dmp family_quasar C:\Windows\System32\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4960 Client.exe -
Drops file in System32 directory 2 IoCs
Processes:
Client-builttttt.exedescription ioc process File created C:\Windows\system32\SubDir\Client.exe Client-builttttt.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client-builttttt.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 5012 schtasks.exe 1604 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-builttttt.exeClient.exedescription pid process Token: SeDebugPrivilege 1440 Client-builttttt.exe Token: SeDebugPrivilege 4960 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4960 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-builttttt.exeClient.exedescription pid process target process PID 1440 wrote to memory of 5012 1440 Client-builttttt.exe schtasks.exe PID 1440 wrote to memory of 5012 1440 Client-builttttt.exe schtasks.exe PID 1440 wrote to memory of 4960 1440 Client-builttttt.exe Client.exe PID 1440 wrote to memory of 4960 1440 Client-builttttt.exe Client.exe PID 4960 wrote to memory of 1604 4960 Client.exe schtasks.exe PID 4960 wrote to memory of 1604 4960 Client.exe schtasks.exe -
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
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C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe"C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1440 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:5012 -
C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4960 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:1604
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD56008b1f40ce25519bacd9a12f89755df
SHA1e38e22911d1baebae439caf4d5556143927e3a02
SHA25633ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7
SHA512133aea39eb9617aa968c33add336304a1b1796ba1945db7ad7b6748d3463e77dbb405ff3755f4dc1f6d3de37eec870d9b01c3dcbaa0ff399f02e86174ec5a2ce