asyncrat | b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973

Analysis

max time kernel
150s
max time network
152s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260710-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
01/08/2026, 13:20

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General

Target
b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
Size 45KB
Sample260801-qlks6abb86
SHA256 b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973
MD5 5e6f512e7cfb5bc7a977c4c2da8734c2
SHA1 aa5d0ffd0f516a5c4f258b31227acb8774b85e6c
SHA512 f41579089f3ac4680c60b253f5b636675a3a68b5baa9a9245529cc4c9f140f406bfb40ac3b79d7f5c7c97143303d7a67180f0678048bd747f8070ed13685903e
SSDEEP 768:MuBGJTP0BQ0UWUWHaimo2qV/Ao0p54FcPIOzjbOgX3i6SYMGP0+lbeqFXx2BDZEx:MuBGJTPho2kADv4FhO3bxXSyhvKOXWdG
TLSH
T1CF233B003BE9823BF2BE5F78ACF26145867AF2636603D5491CC451DB5613FC68A42AFD
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

xcavengon.click:80
xcavengon.click:22
xcavengon.click:8080
xcavengon.click:8880
xcavengon.click:2052
xcavengon.click:2082
xcavengon.click:2086
xcavengon.click:2095
xcavengon.click:443
xcavengon.click:2053
xcavengon.click:2083
xcavengon.click:2087
xcavengon.click:2096
xcavengon.click:8443
www.xcavengon.click:80
www.xcavengon.click:22
www.xcavengon.click:8080
www.xcavengon.click:8880
www.xcavengon.click:2052
www.xcavengon.click:2082
www.xcavengon.click:2086
www.xcavengon.click:2095
www.xcavengon.click:443
www.xcavengon.click:2053
www.xcavengon.click:2083
www.xcavengon.click:2087
www.xcavengon.click:2096
www.xcavengon.click:8443
connect.xcavengon.click:80
connect.xcavengon.click:22
connect.xcavengon.click:8080
connect.xcavengon.click:8880
connect.xcavengon.click:2052
connect.xcavengon.click:2082
connect.xcavengon.click:2086
connect.xcavengon.click:2095
connect.xcavengon.click:443
connect.xcavengon.click:2053
connect.xcavengon.click:2083
connect.xcavengon.click:2087
connect.xcavengon.click:2096
connect.xcavengon.click:8443
mirai.xcavengon.click:80
mirai.xcavengon.click:22
mirai.xcavengon.click:8080
mirai.xcavengon.click:8880
mirai.xcavengon.click:2052
mirai.xcavengon.click:2082
mirai.xcavengon.click:2086
mirai.xcavengon.click:2095
mirai.xcavengon.click:443
mirai.xcavengon.click:2053
mirai.xcavengon.click:2083
mirai.xcavengon.click:2087
mirai.xcavengon.click:2096
mirai.xcavengon.click:8443
rat.xcavengon.click:80
rat.xcavengon.click:22
rat.xcavengon.click:8080
rat.xcavengon.click:8880
rat.xcavengon.click:2052
rat.xcavengon.click:2082
rat.xcavengon.click:2086
rat.xcavengon.click:2095
rat.xcavengon.click:443
rat.xcavengon.click:2053
rat.xcavengon.click:2083
rat.xcavengon.click:2087
rat.xcavengon.click:2096
rat.xcavengon.click:8443

Mutex

EYsGYktUwze6

Attributes

delay
0
install
true
install_file
59oy.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/0x000a000000019caa-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2064	59oy.exe
4876	59oy.exe

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
6112	cmd.exe
4888	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	59oy.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	59oy.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4480	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
4156	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 4888	3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe	89
PID 3680 wrote to memory of 6112	3680	b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe	91
PID 4888 wrote to memory of 4156	4888	cmd.exe	93
PID 6112 wrote to memory of 4480	6112	cmd.exe	94
PID 6112 wrote to memory of 4876	6112	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe
"C:\Users\Admin\AppData\Local\Temp\b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3680
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "59oy" /tr '"C:\Users\Admin\AppData\Roaming\59oy.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4888
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "59oy" /tr '"C:\Users\Admin\AppData\Roaming\59oy.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4156
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7DC1.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:6112
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4480
- - C:\Users\Admin\AppData\Roaming\59oy.exe
    "C:\Users\Admin\AppData\Roaming\59oy.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4876

C:\Users\Admin\AppData\Roaming\59oy.exe
"C:\Users\Admin\AppData\Roaming\59oy.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2064

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

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp7DC1.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp7DC1.tmp.bat
Size 148B
SHA256 77425a167f354837a4945e795a857700c78ddf3fd7ebfd90ff05f5554080086d
MD5 dae5c9c065bee47289abe3d5706ced45
SHA1 1fdb2dd4bcf6991fa9c8799904f90d50fd73e0fa
SHA512 103ad7ab38ba57688933fe392d32a70d19dcc66071da27ead21b8ee447ad7624a902b0ce19cf53550d88f4298367806b6a377ad8cf3a587f2d401b4e3cfe2954
TLSH
T17BC02B8392C5FA0E3905146312FAD58CA1F26C1D3F84BB00C304400D1380C98F4D9382
MD5 SHA1 SHA512 TLSH

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59oy.exe

Path C:\Users\Admin\AppData\Roaming\59oy.exe
Size 45KB
SHA256 b8b7e3921f13539aa2c8dd24505b0ef1e9088db4413445ae68e7b7e3ccc20973
MD5 5e6f512e7cfb5bc7a977c4c2da8734c2
SHA1 aa5d0ffd0f516a5c4f258b31227acb8774b85e6c
SHA512 f41579089f3ac4680c60b253f5b636675a3a68b5baa9a9245529cc4c9f140f406bfb40ac3b79d7f5c7c97143303d7a67180f0678048bd747f8070ed13685903e
SSDEEP 768:MuBGJTP0BQ0UWUWHaimo2qV/Ao0p54FcPIOzjbOgX3i6SYMGP0+lbeqFXx2BDZEx:MuBGJTPho2kADv4FhO3bxXSyhvKOXWdG
TLSH
T1CF233B003BE9823BF2BE5F78ACF26145867AF2636603D5491CC451DB5613FC68A42AFD
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2064-12-0x0000000074230000-0x00000000749EC000-memory.dmp

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memory/2064-14-0x0000000074230000-0x00000000749EC000-memory.dmp

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memory/3680-0-0x0000000074382000-0x0000000074383000-memory.dmp

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memory/3680-1-0x0000000000F00000-0x0000000000F12000-memory.dmp

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memory/3680-2-0x0000000074370000-0x0000000074B2C000-memory.dmp

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memory/3680-3-0x0000000005930000-0x00000000059CC000-memory.dmp

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memory/3680-8-0x0000000074370000-0x0000000074B2C000-memory.dmp

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