Analysis
- max time kernel
149s - max time network
149s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
05/04/2026, 16:45
General
- Target Client-built.exe
- Size 348KB
- Sample260405-t9pc2aaz9z
- SHA256 582cb79ed8d8d476ee038b5c87ed200d792f81a0b4e168a9627437a964362d67
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
-
ryandp-63686.portmap.host:63686
-
QSR_MUTEX_n0f6at7YDD5llBKKrq
-
encryption_key
meoIPp2u9rALJG9Eeixz
-
install_name
svchost.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
2
-
startup_key
update
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar family
- Quasar payload 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.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs
Adversaries may check for Internet connectivity on compromised systems.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\416fzTU0HLcW.bat" "2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\chcp.comchcp 650013⤵
- System Location Discovery: System Language Discovery
-
-
C:\Windows\SysWOW64\PING.EXEping -n 10 localhost3⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
-
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
416fzTU0HLcW.bat
memory/4340-0-0x0000000000D80000-0x0000000000DDE000-memory.dmp
memory/4340-1-0x0000000005C40000-0x00000000061E6000-memory.dmp
memory/4340-2-0x0000000005770000-0x0000000005802000-memory.dmp
memory/4340-3-0x00000000058A0000-0x00000000058B0000-memory.dmp
memory/4340-4-0x0000000005810000-0x0000000005876000-memory.dmp
memory/4340-5-0x0000000006490000-0x00000000064A2000-memory.dmp
memory/4340-6-0x00000000069C0000-0x00000000069FC000-memory.dmp
memory/4340-7-0x0000000006CB0000-0x0000000006CBA000-memory.dmp
memory/4340-8-0x00000000058A0000-0x00000000058B0000-memory.dmp