Analysis
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max time kernel
147s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
13-04-2024 19:15
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win10-20240404-en
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10v2004-20240412-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
61a794936ec8a32416ab054556f6270e
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SHA1
08f16c442752f65c04b8452642fd7b6102314fb0
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SHA256
796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468
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SHA512
8000d3dfca0ef4daca77ad968af0c0ff496de9da59ffa5168479b0dcbd792ce5f1ea620cf0ff51d2bff1613383c3a3feeeccf1e07af963c199cb1d10e4d37988
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SSDEEP
49152:zv+lL26AaNeWgPhlmVqvMQ7XSKjDyr3MfNLoGd6ITTHHB72eh2NT:zvuL26AaNeWgPhlmVqkQ7XSKjDyrE
Malware Config
Extracted
quasar
1.4.1
Office04
LunasLove-64385.portmap.host:64285
29d7a2a1-3a57-4435-8407-1e32b7f510e7
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encryption_key
717F000FA98487F20ACB7C82618D076F1B6DB848
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/2404-0-0x00000000000B0000-0x00000000003D4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4072 Client.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 3032 schtasks.exe 4532 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 2404 Client-built.exe Token: SeDebugPrivilege 4072 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4072 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 2404 wrote to memory of 3032 2404 Client-built.exe schtasks.exe PID 2404 wrote to memory of 3032 2404 Client-built.exe schtasks.exe PID 2404 wrote to memory of 4072 2404 Client-built.exe Client.exe PID 2404 wrote to memory of 4072 2404 Client-built.exe Client.exe PID 4072 wrote to memory of 4532 4072 Client.exe schtasks.exe PID 4072 wrote to memory of 4532 4072 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-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2404 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:3032 -
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
PID:4072 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:4532
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD561a794936ec8a32416ab054556f6270e
SHA108f16c442752f65c04b8452642fd7b6102314fb0
SHA256796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468
SHA5128000d3dfca0ef4daca77ad968af0c0ff496de9da59ffa5168479b0dcbd792ce5f1ea620cf0ff51d2bff1613383c3a3feeeccf1e07af963c199cb1d10e4d37988