Analysis
- max time kernel
141s - max time network
155s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
25/03/2024, 12:57
General
- Target Client-built.exe
- Size 348KB
- Sample240325-p69scabc4v
- SHA256 1e7d5bd9d85650996c6576118409b53d0c677e4035baa3f4d2641d5e9a0b16f9
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
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Vallithebest-32755.portmap.host:32755
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QSR_MUTEX_3gXoc7Rbb6gDK9k7Ha
-
encryption_key
NZgldVKwqeCAFECpbpDa
-
install_name
WindowsSound.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
AuthClient.exe
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- Executes dropped EXE 1 IoCs
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- 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 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
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\SysWOW64\schtasks.exe"schtasks" /create /tn "AuthClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
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C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe"C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "AuthClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1340 --field-trial-handle=2356,i,13261194862334667799,7441241219475888176,262144 --variations-seed-version /prefetch:81⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
WindowsSound.exe
WindowsSound.exe
memory/840-19-0x0000000075370000-0x0000000075B20000-memory.dmp
memory/840-18-0x0000000006E80000-0x0000000006E8A000-memory.dmp
memory/840-16-0x0000000005710000-0x0000000005720000-memory.dmp
memory/840-14-0x0000000075370000-0x0000000075B20000-memory.dmp
memory/3988-3-0x0000000005A50000-0x0000000005AE2000-memory.dmp
memory/3988-7-0x0000000006C90000-0x0000000006CCC000-memory.dmp
memory/3988-6-0x0000000005FA0000-0x0000000005FB2000-memory.dmp
memory/3988-5-0x0000000005C30000-0x0000000005C96000-memory.dmp
memory/3988-4-0x0000000005C20000-0x0000000005C30000-memory.dmp
memory/3988-15-0x0000000075370000-0x0000000075B20000-memory.dmp
memory/3988-0-0x0000000075370000-0x0000000075B20000-memory.dmp
memory/3988-2-0x0000000006000000-0x00000000065A4000-memory.dmp
memory/3988-1-0x0000000000FD0000-0x000000000102E000-memory.dmp