Analysis
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max time kernel
149s -
max time network
135s -
platform
windows7_x64 -
resource
win7-20231129-en -
resource tags
arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system -
submitted
10-04-2024 11:16
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20231129-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
23aaf5e0d106b0f8ce7b98ebb248fa35
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SHA1
898101610b796f5d50de183a04ff029dbc6be064
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SHA256
bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
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SHA512
d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40
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SSDEEP
49152:DvjI22SsaNYfdPBldt698dBcjH4bRJ6ubR3LoGdRPTHHB72eh2NT:Dvc22SsaNYfdPBldt6+dBcjH4bRJ6oB
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.0.115:4782
cf2c53c5-bc92-40a0-b53b-7c5edbcd7ef3
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encryption_key
EAFB08E07600E62659A174CCF3C54BA2CDDDD47A
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/1724-0-0x0000000001190000-0x00000000014B4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/1056-9-0x0000000000B70000-0x0000000000E94000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 1056 Client.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 2396 schtasks.exe 2588 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 1724 Client-built.exe Token: SeDebugPrivilege 1056 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 1056 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 1724 wrote to memory of 2396 1724 Client-built.exe schtasks.exe PID 1724 wrote to memory of 2396 1724 Client-built.exe schtasks.exe PID 1724 wrote to memory of 2396 1724 Client-built.exe schtasks.exe PID 1724 wrote to memory of 1056 1724 Client-built.exe Client.exe PID 1724 wrote to memory of 1056 1724 Client-built.exe Client.exe PID 1724 wrote to memory of 1056 1724 Client-built.exe Client.exe PID 1056 wrote to memory of 2588 1056 Client.exe schtasks.exe PID 1056 wrote to memory of 2588 1056 Client.exe schtasks.exe PID 1056 wrote to memory of 2588 1056 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\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1724 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2396 -
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:1056 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2588
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD523aaf5e0d106b0f8ce7b98ebb248fa35
SHA1898101610b796f5d50de183a04ff029dbc6be064
SHA256bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
SHA512d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40