asyncrat | 61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11

Analysis

max time kernel
148s
max time network
149s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
04/08/2026, 19:57

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General

Target
61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
Size 45KB
Sample260804-yprd4sw1hs
SHA256 61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11
MD5 62c839470b6781fe7d844344afd288a2
SHA1 4bf6e02495c6c359795dc0173c43234019363b4d
SHA512 70fec633b4022e16a06e179eea4cc11928db991aed3d566c3d659cc9c0e6f5080daa2e3ee82f15d28834955c1b2355e44c20726bdf424bdb96fb205cfae49ba3
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9rZbtDMQPI8CjbVgX3i89NzRBDZ8x:0u1YJTHcw2EJk8ObyXSUzvd8x
TLSH
T1F9231C0037E8812BF2BE5F78A8F26245867AF5673603D54E2CC441DB5623FC69A426FD
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

bulon69.com:80
bulon69.com:22
bulon69.com:8080
bulon69.com:8880
bulon69.com:2052
bulon69.com:2082
bulon69.com:2086
bulon69.com:2095
bulon69.com:443
bulon69.com:2053
bulon69.com:2083
bulon69.com:2087
bulon69.com:2096
bulon69.com:8443
www.bulon69.com:80
www.bulon69.com:22
www.bulon69.com:8080
www.bulon69.com:8880
www.bulon69.com:2052
www.bulon69.com:2082
www.bulon69.com:2086
www.bulon69.com:2095
www.bulon69.com:443
www.bulon69.com:2053
www.bulon69.com:2083
www.bulon69.com:2087
www.bulon69.com:2096
www.bulon69.com:8443
klez.bulon69.com:80
klez.bulon69.com:22
klez.bulon69.com:8080
klez.bulon69.com:8880
klez.bulon69.com:2052
klez.bulon69.com:2082
klez.bulon69.com:2086
klez.bulon69.com:2095
klez.bulon69.com:443
klez.bulon69.com:2053
klez.bulon69.com:2083
klez.bulon69.com:2087
klez.bulon69.com:2096
klez.bulon69.com:8443
malware.bulon69.com:80
malware.bulon69.com:22
malware.bulon69.com:8080
malware.bulon69.com:8880
malware.bulon69.com:2052
malware.bulon69.com:2082
malware.bulon69.com:2086
malware.bulon69.com:2095
malware.bulon69.com:443
malware.bulon69.com:2053
malware.bulon69.com:2083
malware.bulon69.com:2087
malware.bulon69.com:2096
malware.bulon69.com:8443
ryuk.bulon69.com:80
ryuk.bulon69.com:22
ryuk.bulon69.com:8080
ryuk.bulon69.com:8880
ryuk.bulon69.com:2052
ryuk.bulon69.com:2082
ryuk.bulon69.com:2086
ryuk.bulon69.com:2095
ryuk.bulon69.com:443
ryuk.bulon69.com:2053
ryuk.bulon69.com:2083
ryuk.bulon69.com:2087
ryuk.bulon69.com:2096
ryuk.bulon69.com:8443

Mutex

xZIQFisbJSC7

Attributes

delay
0
install
true
install_file
yn5yrd.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/0x000e00000001c40b-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2536	yn5yrd.exe
4504	yn5yrd.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	13	103.109.100.136:22
SSH destination	14	103.109.100.136:22

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
4168	cmd.exe
4908	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	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
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	yn5yrd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yn5yrd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4960	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
3748	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
Token: SeDebugPrivilege	2536	yn5yrd.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4156 wrote to memory of 4168	4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe	89
PID 4156 wrote to memory of 4908	4156	61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe	90
PID 4168 wrote to memory of 3748	4168	cmd.exe	93
PID 4908 wrote to memory of 4960	4908	cmd.exe	94
PID 4908 wrote to memory of 4504	4908	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe
"C:\Users\Admin\AppData\Local\Temp\61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4156
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "yn5yrd" /tr '"C:\Users\Admin\AppData\Roaming\yn5yrd.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4168
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "yn5yrd" /tr '"C:\Users\Admin\AppData\Roaming\yn5yrd.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3748
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3D9C.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4908
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4960
- - C:\Users\Admin\AppData\Roaming\yn5yrd.exe
    "C:\Users\Admin\AppData\Roaming\yn5yrd.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4504

C:\Users\Admin\AppData\Roaming\yn5yrd.exe
"C:\Users\Admin\AppData\Roaming\yn5yrd.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2536

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

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Downloads

tmp3D9C.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3D9C.tmp.bat
Size 150B
SHA256 6670e51b44a4ef6887c8faabd1194c41f1b76707f10029b999b13bd628a3392c
MD5 4b4db5ea0c01f2f97b60fdea4cbf487a
SHA1 5accb6361f06fb1467404f9f5d70854f77c3c22b
SHA512 f4081e558b5fed1e4872659f6b229b0bb73204104f68e66e7850fd81ef11d2d5229105f712761d521e2036d0553c0e3b05fccd13c4a67dc2a85883160a585418
TLSH
T137C08C4291CABA0E2806142302BAA58C9162681E3E84AB04D3048A196281858E0A9241
MD5 SHA1 SHA512 TLSH

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yn5yrd.exe

Path C:\Users\Admin\AppData\Roaming\yn5yrd.exe
Size 45KB
SHA256 61f13ec1d9d3c6f10e46f1e50dca08e12b178cc75493d78c8a99536ccd646e11
MD5 62c839470b6781fe7d844344afd288a2
SHA1 4bf6e02495c6c359795dc0173c43234019363b4d
SHA512 70fec633b4022e16a06e179eea4cc11928db991aed3d566c3d659cc9c0e6f5080daa2e3ee82f15d28834955c1b2355e44c20726bdf424bdb96fb205cfae49ba3
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9rZbtDMQPI8CjbVgX3i89NzRBDZ8x:0u1YJTHcw2EJk8ObyXSUzvd8x
TLSH
T1F9231C0037E8812BF2BE5F78A8F26245867AF5673603D54E2CC441DB5623FC69A426FD
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2536-12-0x0000000074BE0000-0x000000007539C000-memory.dmp

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memory/2536-14-0x0000000074BE0000-0x000000007539C000-memory.dmp

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memory/4156-0-0x0000000074D62000-0x0000000074D63000-memory.dmp

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memory/4156-1-0x0000000000790000-0x00000000007A2000-memory.dmp

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memory/4156-2-0x0000000074D50000-0x000000007550C000-memory.dmp

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memory/4156-3-0x0000000005180000-0x000000000521C000-memory.dmp

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memory/4156-8-0x0000000074D50000-0x000000007550C000-memory.dmp

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