Analysis
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max time kernel
150s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
17-04-2024 15:24
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240221-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
eb8790c82d5096b84022449c2298c62a
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SHA1
12030a6f4988fb744328bc1963c7017207e40276
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SHA256
5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82
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SHA512
d4d7ac397e023e6c08dfd6681e802d4c52d56a45a4e66acd53bc0138d3ed45f3930ef0d90cdeaafcf478d08ecab28cae61ffe5c571fa4c37be39497f16891464
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SSDEEP
49152:WvIt62XlaSFNWPjljiFa2RoUYIruW+dpfYoGdizZDTHHB72eh2NT:WvE62XlaSFNWPjljiFXRoUYI6W9
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.240:4782
fcdb4cfb-dc40-4f51-b2c7-f723b5404e35
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encryption_key
1074AFFC8845D6B93DCAD37B9C170AE9CD58D08A
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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
Windowsstartup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4984-0-0x00000000001E0000-0x0000000000504000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 3684 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 2588 schtasks.exe 5088 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 4984 Client-built.exe Token: SeDebugPrivilege 3684 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 3684 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 4984 wrote to memory of 2588 4984 Client-built.exe schtasks.exe PID 4984 wrote to memory of 2588 4984 Client-built.exe schtasks.exe PID 4984 wrote to memory of 3684 4984 Client-built.exe Client.exe PID 4984 wrote to memory of 3684 4984 Client-built.exe Client.exe PID 3684 wrote to memory of 5088 3684 Client.exe schtasks.exe PID 3684 wrote to memory of 5088 3684 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:4984 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2588 -
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:3684 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windowsstartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:5088
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5eb8790c82d5096b84022449c2298c62a
SHA112030a6f4988fb744328bc1963c7017207e40276
SHA2565bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82
SHA512d4d7ac397e023e6c08dfd6681e802d4c52d56a45a4e66acd53bc0138d3ed45f3930ef0d90cdeaafcf478d08ecab28cae61ffe5c571fa4c37be39497f16891464