Analysis
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max time kernel
147s -
max time network
149s -
platform
windows7_x64 -
resource
win7-20240704-en -
resource tags
arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system -
submitted
18/08/2024, 21:50
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240704-en
General
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Target
Client-built.exe
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Size
3.3MB
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MD5
7021b44ffa619a2a286dd9bd55d1e321
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SHA1
de69ec28f445e6c47b1d2f4440465f3ffc2df174
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SHA256
fd96603f9b5aa63021f7bbf8cb6aa320154b43f53c62ddeb011a395327c6093e
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SHA512
546909a07d8e229c0510c249c4b31c78d699a31130e9933ecc03cc2a1b4a7778bbcb872668aab8575050fe4b6c72715164f290a368dd6471e1c492393cf04f13
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SSDEEP
49152:G6LFXL5Z8hlPKxXavFTu9sHMI2jixTHHB72eh2NT1:G6p5Z8hlPKxXavFT+ssYc
Malware Config
Extracted
quasar
1.4.1
SKIDS
147.185.221.22:6712
d1acafd6-31e9-4a2f-a5a8-7043dfc62d60
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encryption_key
5678253D7FFD68D83D55A584486F1015D2B1BC30
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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 3 IoCs
resource yara_rule behavioral1/memory/2448-1-0x0000000000810000-0x0000000000B68000-memory.dmp family_quasar behavioral1/files/0x000800000001746a-6.dat family_quasar behavioral1/memory/2732-10-0x0000000000C50000-0x0000000000FA8000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2732 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 2808 schtasks.exe 2836 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2448 Client-built.exe Token: SeDebugPrivilege 2732 Windows Host Process.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2732 Windows Host Process.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2732 Windows Host Process.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2732 Windows Host Process.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 2448 wrote to memory of 2808 2448 Client-built.exe 30 PID 2448 wrote to memory of 2808 2448 Client-built.exe 30 PID 2448 wrote to memory of 2808 2448 Client-built.exe 30 PID 2448 wrote to memory of 2732 2448 Client-built.exe 32 PID 2448 wrote to memory of 2732 2448 Client-built.exe 32 PID 2448 wrote to memory of 2732 2448 Client-built.exe 32 PID 2732 wrote to memory of 2836 2732 Windows Host Process.exe 33 PID 2732 wrote to memory of 2836 2732 Windows Host Process.exe 33 PID 2732 wrote to memory of 2836 2732 Windows Host Process.exe 33 -
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:2448 -
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:2808
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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:2732 -
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:2836
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD57021b44ffa619a2a286dd9bd55d1e321
SHA1de69ec28f445e6c47b1d2f4440465f3ffc2df174
SHA256fd96603f9b5aa63021f7bbf8cb6aa320154b43f53c62ddeb011a395327c6093e
SHA512546909a07d8e229c0510c249c4b31c78d699a31130e9933ecc03cc2a1b4a7778bbcb872668aab8575050fe4b6c72715164f290a368dd6471e1c492393cf04f13