Analysis
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max time kernel
150s -
max time network
155s -
platform
windows11-21h2_x64 -
resource
win11-20240802-fr -
resource tags
arch:x64arch:x86image:win11-20240802-frlocale:fr-fros:windows11-21h2-x64systemwindows -
submitted
18/08/2024, 22:00
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win10-20240404-fr
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10v2004-20240802-fr
General
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Target
Client-built.exe
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Size
3.3MB
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MD5
7ab6f43a992374ea2bc02b6870f92726
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SHA1
52277ea3799bc72c661a82d079184898239301db
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SHA256
659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819
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SHA512
e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e
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SSDEEP
49152:yei8dGFjxJFp/DGoye3Z4LVu0jvqCtQI2VEeTHHB72eh2NTf:yeCFjxJTbGor3Z4LVu0fKw/
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 behavioral3/memory/4028-1-0x00000000008E0000-0x0000000000C36000-memory.dmp family_quasar behavioral3/files/0x000100000002aa63-4.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 4720 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 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 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 -
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 1544 schtasks.exe 1860 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4028 Client-built.exe Token: SeDebugPrivilege 4720 Windows Host Process.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4720 Windows Host Process.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 4028 wrote to memory of 1544 4028 Client-built.exe 81 PID 4028 wrote to memory of 1544 4028 Client-built.exe 81 PID 4028 wrote to memory of 4720 4028 Client-built.exe 83 PID 4028 wrote to memory of 4720 4028 Client-built.exe 83 PID 4720 wrote to memory of 1860 4720 Windows Host Process.exe 84 PID 4720 wrote to memory of 1860 4720 Windows Host Process.exe 84 -
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:4028 -
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:1544
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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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4720 -
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:1860
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
3.3MB
MD57ab6f43a992374ea2bc02b6870f92726
SHA152277ea3799bc72c661a82d079184898239301db
SHA256659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819
SHA512e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e