asyncrat | 3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37

Analysis

max time kernel
6s
max time network
151s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
04/08/2026, 08:00

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General

Target
3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
Size 45KB
Sample260804-jv5rcsan41
SHA256 3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37
MD5 11d433e4eaa991ade048680f2acbdcab
SHA1 4a5765205793733f1b263c62b6ddf05cf8f56b30
SHA512 d3e0c65c63b4d5a07b56719120ba125a2acec48958c29c92471ef4c36aca4b4889232eff7a4f063d3505ef0eb15d58808451b6d2fa14d004ea968938bbcf90e9
SSDEEP 768:8uUIpT4vvofWWUEXb+Imo2q4D9wScq/z1OPIszjbtgg3i+EEiPkNpMhMfpBDZ0x:8uUIpT4vAj2Hi9K3s3b6gS++PkNpMh+U
TLSH
T1292319003BE8C12BF2BE4F7899F26145867AF2633603D54A1CC452D75713BC69A526FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

fimsexvietnam.com:80
fimsexvietnam.com:22
fimsexvietnam.com:8080
fimsexvietnam.com:8880
fimsexvietnam.com:2052
fimsexvietnam.com:2082
fimsexvietnam.com:2086
fimsexvietnam.com:2095
fimsexvietnam.com:443
fimsexvietnam.com:2053
fimsexvietnam.com:2083
fimsexvietnam.com:2087
fimsexvietnam.com:2096
fimsexvietnam.com:8443
www.fimsexvietnam.com:80
www.fimsexvietnam.com:22
www.fimsexvietnam.com:8080
www.fimsexvietnam.com:8880
www.fimsexvietnam.com:2052
www.fimsexvietnam.com:2082
www.fimsexvietnam.com:2086
www.fimsexvietnam.com:2095
www.fimsexvietnam.com:443
www.fimsexvietnam.com:2053
www.fimsexvietnam.com:2083
www.fimsexvietnam.com:2087
www.fimsexvietnam.com:2096
www.fimsexvietnam.com:8443
locky.fimsexvietnam.com:80
locky.fimsexvietnam.com:22
locky.fimsexvietnam.com:8080
locky.fimsexvietnam.com:8880
locky.fimsexvietnam.com:2052
locky.fimsexvietnam.com:2082
locky.fimsexvietnam.com:2086
locky.fimsexvietnam.com:2095
locky.fimsexvietnam.com:443
locky.fimsexvietnam.com:2053
locky.fimsexvietnam.com:2083
locky.fimsexvietnam.com:2087
locky.fimsexvietnam.com:2096
locky.fimsexvietnam.com:8443
malware.fimsexvietnam.com:80
malware.fimsexvietnam.com:22
malware.fimsexvietnam.com:8080
malware.fimsexvietnam.com:8880
malware.fimsexvietnam.com:2052
malware.fimsexvietnam.com:2082
malware.fimsexvietnam.com:2086
malware.fimsexvietnam.com:2095
malware.fimsexvietnam.com:443
malware.fimsexvietnam.com:2053
malware.fimsexvietnam.com:2083
malware.fimsexvietnam.com:2087
malware.fimsexvietnam.com:2096
malware.fimsexvietnam.com:8443
ryuk.fimsexvietnam.com:80
ryuk.fimsexvietnam.com:22
ryuk.fimsexvietnam.com:8080
ryuk.fimsexvietnam.com:8880
ryuk.fimsexvietnam.com:2052
ryuk.fimsexvietnam.com:2082
ryuk.fimsexvietnam.com:2086
ryuk.fimsexvietnam.com:2095
ryuk.fimsexvietnam.com:443
ryuk.fimsexvietnam.com:2053
ryuk.fimsexvietnam.com:2083
ryuk.fimsexvietnam.com:2087
ryuk.fimsexvietnam.com:2096
ryuk.fimsexvietnam.com:8443

Mutex

JVMOfArYAw0r

Attributes

delay
0
install
true
install_file
wio0byk.exe
install_folder
%AppData%

aes.plain

Signatures

Family: 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/files/0x000d00000001c548-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2880	wio0byk.exe
4868	wio0byk.exe

Outbound SSH connection to public host 2 TTPs 2 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc
SSH destination	10	172.67.182.173:22
SSH destination	9	104.21.36.7:22

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2124	cmd.exe
3648	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wio0byk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wio0byk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3300	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

pid	Process
1256	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2548 wrote to memory of 2124	2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe	89
PID 2548 wrote to memory of 3648	2548	3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe	91
PID 2124 wrote to memory of 1256	2124	cmd.exe	93
PID 3648 wrote to memory of 3300	3648	cmd.exe	94
PID 3648 wrote to memory of 4868	3648	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe
"C:\Users\Admin\AppData\Local\Temp\3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2548
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "wio0byk" /tr '"C:\Users\Admin\AppData\Roaming\wio0byk.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2124
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "wio0byk" /tr '"C:\Users\Admin\AppData\Roaming\wio0byk.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1256
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1478.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3648
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3300
- - C:\Users\Admin\AppData\Roaming\wio0byk.exe
    "C:\Users\Admin\AppData\Roaming\wio0byk.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4868

C:\Users\Admin\AppData\Roaming\wio0byk.exe
"C:\Users\Admin\AppData\Roaming\wio0byk.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2880

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Network Service Discovery

T1046

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

T1572

Exfiltration

Impact

Replay Monitor

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Downloads

tmp1478.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp1478.tmp.bat
Size 151B
SHA256 2b8e5eea652471686dce970dfdd27fc5d8f5c7180c7daad683a1bc95ee591840
MD5 bf55fdbb8b9f0dda2b82b4041eec4e75
SHA1 0017dc814ef61e9cbc0796dbe4c6fcb06f1e47b1
SHA512 6362e09df35d83e43173f767994de8048637e58755bdf5c487278aa71d6bb94432c6153cd8e949db19c8b3f0a70e81e40228cd250cd65a0bd9c5badc5648bf26
TLSH
T1A5C02B6265C9EB5E280A185303FAD69C9176FC593FC4BB10C304850E128044CF0DE345
MD5 SHA1 SHA512 TLSH

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wio0byk.exe

Path C:\Users\Admin\AppData\Roaming\wio0byk.exe
Size 45KB
SHA256 3f219456535da01a324c8cad24aceef1b3d3d30d3dd1700e1090d2d24d5e4e37
MD5 11d433e4eaa991ade048680f2acbdcab
SHA1 4a5765205793733f1b263c62b6ddf05cf8f56b30
SHA512 d3e0c65c63b4d5a07b56719120ba125a2acec48958c29c92471ef4c36aca4b4889232eff7a4f063d3505ef0eb15d58808451b6d2fa14d004ea968938bbcf90e9
SSDEEP 768:8uUIpT4vvofWWUEXb+Imo2q4D9wScq/z1OPIszjbtgg3i+EEiPkNpMhMfpBDZ0x:8uUIpT4vAj2Hi9K3s3b6gS++PkNpMh+U
TLSH
T1292319003BE8C12BF2BE4F7899F26145867AF2633603D54A1CC452D75713BC69A526FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2548-0-0x0000000074A92000-0x0000000074A93000-memory.dmp

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memory/2548-1-0x0000000000BC0000-0x0000000000BD2000-memory.dmp

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memory/2548-2-0x0000000074A80000-0x000000007523C000-memory.dmp

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memory/2548-3-0x00000000055E0000-0x000000000567C000-memory.dmp

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memory/2548-8-0x0000000074A80000-0x000000007523C000-memory.dmp

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memory/2880-12-0x0000000074990000-0x000000007514C000-memory.dmp

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memory/2880-14-0x0000000074990000-0x000000007514C000-memory.dmp

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