Analysis
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max time kernel
145s -
max time network
153s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
30/03/2024, 03:18
Behavioral task
behavioral1
Sample
Client-buailt.exe
Resource
win7-20240221-en
General
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Target
Client-buailt.exe
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Size
3.3MB
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MD5
67058a89ce6f3786bc28af9962d6202d
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SHA1
57b66752526058f244ed0802d771b0b4d70432a9
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SHA256
ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d
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SHA512
98a0cc78d49cba94cc5edd2804697391861cd0192ce10aeb93223ad05046a1418d1380c3a3cd7a1e17f0ab290e0a10cd60d3f0e8959ca4783d2eef7460a8ce62
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SSDEEP
49152:qv+I22SsaNYfdPBldt698dBcjHQfnk9hbvJULoGdP7bTHHB72eh2NT/ZqS:qvz22SsaNYfdPBldt6+dBcjHBhA
Malware Config
Extracted
quasar
1.4.1
Office01
198.7.62.204:4782
192.168.1.1:4782
02b9c972-8b55-4d55-b7c4-09a1f00ff400
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encryption_key
5BF0703F288C43118835CAF4D1A6879C29016FB3
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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
Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/1160-0-0x0000000000480000-0x00000000007C8000-memory.dmp family_quasar behavioral2/files/0x00020000000227ea-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 756 Client.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File opened for modification C:\Windows\system32\SubDir\Client.exe Client-buailt.exe File opened for modification C:\Windows\system32\SubDir Client-buailt.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client.exe File opened for modification C:\Windows\system32\SubDir Client.exe File created C:\Windows\system32\SubDir\Client.exe Client-buailt.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 1764 schtasks.exe 4988 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 1160 Client-buailt.exe Token: SeDebugPrivilege 756 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 756 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 1160 wrote to memory of 1764 1160 Client-buailt.exe 96 PID 1160 wrote to memory of 1764 1160 Client-buailt.exe 96 PID 1160 wrote to memory of 756 1160 Client-buailt.exe 98 PID 1160 wrote to memory of 756 1160 Client-buailt.exe 98 PID 756 wrote to memory of 4988 756 Client.exe 99 PID 756 wrote to memory of 4988 756 Client.exe 99 -
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-buailt.exe"C:\Users\Admin\AppData\Local\Temp\Client-buailt.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1160 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:1764
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:756 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:4988
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1348 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:81⤵PID:2272
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD567058a89ce6f3786bc28af9962d6202d
SHA157b66752526058f244ed0802d771b0b4d70432a9
SHA256ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d
SHA51298a0cc78d49cba94cc5edd2804697391861cd0192ce10aeb93223ad05046a1418d1380c3a3cd7a1e17f0ab290e0a10cd60d3f0e8959ca4783d2eef7460a8ce62