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Analysis
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max time kernel
149s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
26/01/2025, 21:41
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240903-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
bcfb625c8bdc9d6f55e16fc7c363292f
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SHA1
a5da3ba7826fcbe4b1e53d1a8faab851d65b9e5d
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SHA256
411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb
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SHA512
b39bc965b5b0eb7207d31276e9d04830c9af4201613a9854595e3c78d3c0e13b7e5af3ae14a22b08b24b6063eaf8856db7a986546901941be301cc03707944fa
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SSDEEP
49152:SviI22SsaNYfdPBldt698dBcjHBCj1JOLoGd+bTHHB72eh2NT:Svv22SsaNYfdPBldt6+dBcjHBCs
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.178.152:4782
bacc9e85-2eef-4433-8941-a9c611b9e303
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encryption_key
D40083F8A2F2D1B1C3C76364F5615E487354F5D3
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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
Windows Client Startup
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subdirectory
SubDir
Signatures
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Quasar family
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Quasar payload 2 IoCs
resource yara_rule behavioral2/memory/2968-1-0x0000000000770000-0x0000000000A94000-memory.dmp family_quasar behavioral2/files/0x000a000000023ba0-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 4616 Client.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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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 2812 schtasks.exe 1248 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2968 Client-built.exe Token: SeDebugPrivilege 4616 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 4616 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 4616 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4616 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 2968 wrote to memory of 2812 2968 Client-built.exe 82 PID 2968 wrote to memory of 2812 2968 Client-built.exe 82 PID 2968 wrote to memory of 4616 2968 Client-built.exe 84 PID 2968 wrote to memory of 4616 2968 Client-built.exe 84 PID 4616 wrote to memory of 1248 4616 Client.exe 86 PID 4616 wrote to memory of 1248 4616 Client.exe 86 -
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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2968 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2812
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4616 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:1248
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5bcfb625c8bdc9d6f55e16fc7c363292f
SHA1a5da3ba7826fcbe4b1e53d1a8faab851d65b9e5d
SHA256411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb
SHA512b39bc965b5b0eb7207d31276e9d04830c9af4201613a9854595e3c78d3c0e13b7e5af3ae14a22b08b24b6063eaf8856db7a986546901941be301cc03707944fa