Analysis
- max time kernel
1s - max time network
45s - platform
windows11-21h2_x64 - resource
win11-20240221-en - resource tags
- submitted
31/03/2024, 16:35
General
- Target Client-built.exe
- Size 3.1MB
- Sample240331-t3s3msfe67
- SHA256 ff33af1a478c236bd260ba68e8f0c7e68ec912a93ba174fdfe476b6a8de71410
Malware Config
Extracted
-
quasar
-
1.4.1
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Office04
-
78.17.40.169:4782
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c42aeb5f-442d-43d8-9044-c765c1ca1b99
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encryption_key
687CF235C1C0A46889C4A565EB4CE8085A1343E5
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install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
- 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
-
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
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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)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
-
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)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/968-9-0x00007FFC69050000-0x00007FFC69B12000-memory.dmp
memory/968-11-0x000000001BF00000-0x000000001BF10000-memory.dmp
memory/968-12-0x000000001CAA0000-0x000000001CAF0000-memory.dmp
memory/968-13-0x000000001CBB0000-0x000000001CC62000-memory.dmp
memory/968-14-0x00007FFC69050000-0x00007FFC69B12000-memory.dmp
memory/968-15-0x000000001BF00000-0x000000001BF10000-memory.dmp
memory/2520-0-0x00000000008B0000-0x0000000000BD4000-memory.dmp
memory/2520-2-0x000000001B9C0000-0x000000001B9D0000-memory.dmp
memory/2520-1-0x00007FFC69050000-0x00007FFC69B12000-memory.dmp
memory/2520-10-0x00007FFC69050000-0x00007FFC69B12000-memory.dmp