Analysis
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max time kernel
444s -
max time network
448s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
18/08/2024, 21:57
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240729-en
General
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Target
Client-built.exe
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Size
3.3MB
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MD5
280cdb0f182b4fca9cd0fd87ab0f9551
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SHA1
b7631a3d0bc305c70f1a0711ca0d3b03d82252ec
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SHA256
88641b449e8a26c6468058f54acf474225b571dab55a921caed63020390b6896
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SHA512
d35ec454f18987a700506e1585cfd313906a3e2ab868040b38bba3682ab61b78dc4eec224c23fb8309a8cbd6ae664299940ec8d00afbc0ffaf1a248230c1c8cd
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SSDEEP
49152:56LFXL5Z8hlPKxXavRZbki7yEI2hBqTHHB72eh2NT1:56p5Z8hlPKxXavRZIi7vj
Malware Config
Extracted
quasar
1.4.1
SKIDS
147.185.221.22:6712
1051d457-43fe-4be3-87a0-52f2e36a87aa
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encryption_key
F387A0FF28E4F7F4D7B4E353EB2E71F75D3FB5C0
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install_name
Windows Host Process.exe
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log_directory
Windows-Logs
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reconnect_delay
3000
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startup_key
Windows Host Process
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subdirectory
Windows
Signatures
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/376-1-0x0000000000190000-0x00000000004E6000-memory.dmp family_quasar behavioral2/files/0x00080000000234af-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2136 Windows Host Process.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe Client-built.exe File opened for modification C:\Windows\system32\Windows Client-built.exe File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe Windows Host Process.exe File opened for modification C:\Windows\system32\Windows Windows Host Process.exe File created C:\Windows\system32\Windows\Windows Host Process.exe Client-built.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3176 schtasks.exe 2956 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 376 Client-built.exe Token: SeDebugPrivilege 2136 Windows Host Process.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2136 Windows Host Process.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2136 Windows Host Process.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2136 Windows Host Process.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 376 wrote to memory of 2956 376 Client-built.exe 87 PID 376 wrote to memory of 2956 376 Client-built.exe 87 PID 376 wrote to memory of 2136 376 Client-built.exe 89 PID 376 wrote to memory of 2136 376 Client-built.exe 89 PID 2136 wrote to memory of 3176 2136 Windows Host Process.exe 91 PID 2136 wrote to memory of 3176 2136 Windows Host Process.exe 91 -
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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:376 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2956
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C:\Windows\system32\Windows\Windows Host Process.exe"C:\Windows\system32\Windows\Windows Host Process.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2136 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:3176
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD5280cdb0f182b4fca9cd0fd87ab0f9551
SHA1b7631a3d0bc305c70f1a0711ca0d3b03d82252ec
SHA25688641b449e8a26c6468058f54acf474225b571dab55a921caed63020390b6896
SHA512d35ec454f18987a700506e1585cfd313906a3e2ab868040b38bba3682ab61b78dc4eec224c23fb8309a8cbd6ae664299940ec8d00afbc0ffaf1a248230c1c8cd