Analysis
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max time kernel
126s -
max time network
143s -
platform
windows10-2004_x64 -
resource
win10v2004-20240730-en -
resource tags
arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system -
submitted
31-07-2024 23:53
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240729-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
b45a77a2cdaca1dbaf0ebeec34178a95
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SHA1
4b43a29635df7b060ec3c7696c45446bf37c8150
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SHA256
76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c
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SHA512
cdfbe90b1ad02b69a5bfcb577d1cd8c12d055df2e370716d0faccf65364edecf5c8103f55355daa11a8d845a24d453b78c6e49f06242043ffa1a0a9d8e7d052d
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SSDEEP
49152:Dv+lL26AaNeWgPhlmVqvMQ7XSKeCxNESErk/i8LoGdlETHHB72eh2NT:DvuL26AaNeWgPhlmVqkQ7XSKrxaC
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.28:4782
180b92ba-98f1-484b-b54f-264758c8d7f4
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encryption_key
E2AD968D101B25448614267CCA174D53CE1050BA
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install_name
BootstrapperV1.11.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
BootstrapperV1.11
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/3412-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
BootstrapperV1.11.exepid process 2112 BootstrapperV1.11.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 1812 schtasks.exe 4724 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeBootstrapperV1.11.exedescription pid process Token: SeDebugPrivilege 3412 Client-built.exe Token: SeDebugPrivilege 2112 BootstrapperV1.11.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
BootstrapperV1.11.exepid process 2112 BootstrapperV1.11.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeBootstrapperV1.11.exedescription pid process target process PID 3412 wrote to memory of 1812 3412 Client-built.exe schtasks.exe PID 3412 wrote to memory of 1812 3412 Client-built.exe schtasks.exe PID 3412 wrote to memory of 2112 3412 Client-built.exe BootstrapperV1.11.exe PID 3412 wrote to memory of 2112 3412 Client-built.exe BootstrapperV1.11.exe PID 2112 wrote to memory of 4724 2112 BootstrapperV1.11.exe schtasks.exe PID 2112 wrote to memory of 4724 2112 BootstrapperV1.11.exe schtasks.exe -
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:3412 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1812 -
C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe"C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2112 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:4724
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5b45a77a2cdaca1dbaf0ebeec34178a95
SHA14b43a29635df7b060ec3c7696c45446bf37c8150
SHA25676ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c
SHA512cdfbe90b1ad02b69a5bfcb577d1cd8c12d055df2e370716d0faccf65364edecf5c8103f55355daa11a8d845a24d453b78c6e49f06242043ffa1a0a9d8e7d052d