Analysis
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max time kernel
125s -
max time network
144s -
platform
windows10-2004_x64 -
resource
win10v2004-20240730-en -
resource tags
arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system -
submitted
01-08-2024 02:03
Behavioral task
behavioral1
Sample
BootstrapperV1.11.exe
Resource
win7-20240705-en
General
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Target
BootstrapperV1.11.exe
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Size
3.1MB
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MD5
f9da53f4f072c15dbf78b015a10575a2
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SHA1
96ea78662e9f44d6b4dcbbdc05bb4026188697ff
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SHA256
dd37983f893fe6aec0c2721e910896122de0549306fbc60277c3adf8a991bd0c
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SHA512
be39c735e3aa3a361b3ad2fd766182df0fa2dabbb50c3793f8d92d3c5ee1243d0111e2b40f47a2a68ab0a4e107bb50e411281b6d91fb4a17d0dfb8dd761dfa6f
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SSDEEP
49152:2vHY52fyaSZOrPWluWBuGG5g5hYPV8mC9QoGErqTHHB72eh2NT:2v452fyaSZOrPWluWBDG5g5hYPVBq
Malware Config
Extracted
quasar
1.4.1
Office04
10.2.0.2:4782
cc6f57e2-b224-4b7b-bfae-0b1e6f95f22f
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encryption_key
48E15FD52A3A24CE1F767DA2AD76CB0B862CC879
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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
Solara
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/2892-1-0x0000000000A80000-0x0000000000DA4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 3024 Client.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 1680 schtasks.exe 2672 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
BootstrapperV1.11.exeClient.exedescription pid process Token: SeDebugPrivilege 2892 BootstrapperV1.11.exe Token: SeDebugPrivilege 3024 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 3024 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
BootstrapperV1.11.exeClient.exedescription pid process target process PID 2892 wrote to memory of 1680 2892 BootstrapperV1.11.exe schtasks.exe PID 2892 wrote to memory of 1680 2892 BootstrapperV1.11.exe schtasks.exe PID 2892 wrote to memory of 3024 2892 BootstrapperV1.11.exe Client.exe PID 2892 wrote to memory of 3024 2892 BootstrapperV1.11.exe Client.exe PID 3024 wrote to memory of 2672 3024 Client.exe schtasks.exe PID 3024 wrote to memory of 2672 3024 Client.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\BootstrapperV1.11.exe"C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.11.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2892 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1680 -
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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3024 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2672
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5f9da53f4f072c15dbf78b015a10575a2
SHA196ea78662e9f44d6b4dcbbdc05bb4026188697ff
SHA256dd37983f893fe6aec0c2721e910896122de0549306fbc60277c3adf8a991bd0c
SHA512be39c735e3aa3a361b3ad2fd766182df0fa2dabbb50c3793f8d92d3c5ee1243d0111e2b40f47a2a68ab0a4e107bb50e411281b6d91fb4a17d0dfb8dd761dfa6f