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Analysis
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max time kernel
150s -
max time network
139s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
29/01/2025, 17:20
Behavioral task
behavioral1
Sample
ScreenSync.exe
Resource
win7-20240903-en
General
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Target
ScreenSync.exe
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Size
3.1MB
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MD5
30fbaed202420d9498bdb13c9693d80e
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SHA1
b38397ae8616f9776fb2af4c64691c4b63a26e7b
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SHA256
a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead
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SHA512
9ff1f624174a90b4aeb648f11a92fd3baa5fd1f9c70f6ef5a9c55338fae83d8427206ae514fb9acae0156f1e6dfc2c0472be591ab7ff1fa0a6119edbd55b6f3d
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SSDEEP
49152:2vBt62XlaSFNWPjljiFa2RoUYIzp5rbR4jLoGdlTHHB72eh2NT:2vr62XlaSFNWPjljiFXRoUYIzp5mv
Malware Config
Extracted
quasar
1.4.1
Leo
192.168.0.17:4200
c93cab56-a846-47c9-8b65-82599c60a04c
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encryption_key
9D84316EB0C7F33BAF79572A6CB80DCB88C8D3CF
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install_name
ScreenSync.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
system32.exe
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subdirectory
drivers
Signatures
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Quasar family
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Quasar payload 3 IoCs
resource yara_rule behavioral1/memory/1992-1-0x0000000000040000-0x0000000000364000-memory.dmp family_quasar behavioral1/files/0x0007000000012117-6.dat family_quasar behavioral1/memory/2396-9-0x00000000013A0000-0x00000000016C4000-memory.dmp family_quasar -
Drops file in Drivers directory 3 IoCs
description ioc Process File created C:\Windows\system32\drivers\ScreenSync.exe ScreenSync.exe File opened for modification C:\Windows\system32\drivers\ScreenSync.exe ScreenSync.exe File opened for modification C:\Windows\system32\drivers\ScreenSync.exe ScreenSync.exe -
Executes dropped EXE 1 IoCs
pid Process 2396 ScreenSync.exe -
Drops file in System32 directory 2 IoCs
description ioc Process File opened for modification C:\Windows\system32\drivers ScreenSync.exe File opened for modification C:\Windows\system32\drivers ScreenSync.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 2356 schtasks.exe 2108 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1992 ScreenSync.exe Token: SeDebugPrivilege 2396 ScreenSync.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2396 ScreenSync.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 1992 wrote to memory of 2356 1992 ScreenSync.exe 30 PID 1992 wrote to memory of 2356 1992 ScreenSync.exe 30 PID 1992 wrote to memory of 2356 1992 ScreenSync.exe 30 PID 1992 wrote to memory of 2396 1992 ScreenSync.exe 32 PID 1992 wrote to memory of 2396 1992 ScreenSync.exe 32 PID 1992 wrote to memory of 2396 1992 ScreenSync.exe 32 PID 2396 wrote to memory of 2108 2396 ScreenSync.exe 33 PID 2396 wrote to memory of 2108 2396 ScreenSync.exe 33 PID 2396 wrote to memory of 2108 2396 ScreenSync.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\ScreenSync.exe"C:\Users\Admin\AppData\Local\Temp\ScreenSync.exe"1⤵
- Drops file in Drivers directory
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1992 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "system32.exe" /sc ONLOGON /tr "C:\Windows\system32\drivers\ScreenSync.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2356
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C:\Windows\system32\drivers\ScreenSync.exe"C:\Windows\system32\drivers\ScreenSync.exe"2⤵
- Drops file in Drivers directory
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2396 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "system32.exe" /sc ONLOGON /tr "C:\Windows\system32\drivers\ScreenSync.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2108
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD530fbaed202420d9498bdb13c9693d80e
SHA1b38397ae8616f9776fb2af4c64691c4b63a26e7b
SHA256a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead
SHA5129ff1f624174a90b4aeb648f11a92fd3baa5fd1f9c70f6ef5a9c55338fae83d8427206ae514fb9acae0156f1e6dfc2c0472be591ab7ff1fa0a6119edbd55b6f3d