Analysis
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max time kernel
130s -
max time network
144s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
30/03/2024, 03:20
Behavioral task
behavioral1
Sample
Client-abuilt.exe
Resource
win7-20240221-en
General
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Target
Client-abuilt.exe
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Size
3.3MB
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MD5
fe6bb1f615029c7e339444cbc41706bb
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SHA1
cabd13e4e04ef81687812f8680e55e048ee75bd7
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SHA256
b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77
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SHA512
90b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82
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SSDEEP
49152:3v+I22SsaNYfdPBldt698dBcjHQr0hrTavJSZoGdbTHHB72eh2NTDZqS:3vz22SsaNYfdPBldt6+dBcjHdTB
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 3 IoCs
resource yara_rule behavioral1/memory/2660-0-0x0000000000360000-0x00000000006A8000-memory.dmp family_quasar behavioral1/files/0x000e000000014698-6.dat family_quasar behavioral1/memory/2680-9-0x0000000000CE0000-0x0000000001028000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2680 Client.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File opened for modification C:\Windows\system32\SubDir Client-abuilt.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-abuilt.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client-abuilt.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 2960 schtasks.exe 2420 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2660 Client-abuilt.exe Token: SeDebugPrivilege 2680 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2680 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 2660 wrote to memory of 2960 2660 Client-abuilt.exe 28 PID 2660 wrote to memory of 2960 2660 Client-abuilt.exe 28 PID 2660 wrote to memory of 2960 2660 Client-abuilt.exe 28 PID 2660 wrote to memory of 2680 2660 Client-abuilt.exe 30 PID 2660 wrote to memory of 2680 2660 Client-abuilt.exe 30 PID 2660 wrote to memory of 2680 2660 Client-abuilt.exe 30 PID 2680 wrote to memory of 2420 2680 Client.exe 31 PID 2680 wrote to memory of 2420 2680 Client.exe 31 PID 2680 wrote to memory of 2420 2680 Client.exe 31 -
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-abuilt.exe"C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2660 -
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:2960
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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:2680 -
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:2420
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD5fe6bb1f615029c7e339444cbc41706bb
SHA1cabd13e4e04ef81687812f8680e55e048ee75bd7
SHA256b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77
SHA51290b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82