asyncrat | 41d7d8d9eef7819dff69c2fe448c4333b9eeeb0d0f4bf86489521abb0ce58d63

Analysis

max time kernel
148s
max time network
140s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
28/07/2026, 03:58

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General

Target
gayyy.exe
Size 47KB
Sample260728-ejmn7axfkh
SHA256 41d7d8d9eef7819dff69c2fe448c4333b9eeeb0d0f4bf86489521abb0ce58d63
MD5 de7e82e617be73ced59585f3dd73b38d
SHA1 7c06d9c7490bed6fe3756c256bdf840ff9242241
SHA512 7bc47849631b32b0ce7efd88ab2a2fc2d3454d448ea38961a0f311c1529146125d7adb3e3418a342fb530d9aecb146c4d71160f16bed3182a03b6ea235c825c1
SSDEEP 768:QuANNTR4ydbWUnrGJmo2q7V/mxZ20tlNPIVJDw1y0bQ6zwuVvE+LPZgQraBDZAx:QuANNTRZ22Q/r0t0VJkNbQ6FVvECPuQf
TLSH
T1E7232C007BE98236F2BE4F74A9F22155867AB2673603D64D2CC441D75A13FC29A426FE
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

789win.thaichi.co/vn/:6606
789win.thaichi.co/vn/:80
789win.thaichi.co/vn/:8080
789win.thaichi.co/vn/:443
789win.thaichi.co/vn/:8443
789win.thaichi.co/vn/:22
789win.thaichi.co/vn/:23
thaichi.co/vn/:6606
thaichi.co/vn/:80
thaichi.co/vn/:8080
thaichi.co/vn/:443
thaichi.co/vn/:8443
thaichi.co/vn/:22
thaichi.co/vn/:23

Mutex

09ESpI2azpOD

Attributes

delay
3
install
true
install_file
GoogleUpdate.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/0x00090000000167e7-11.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
1760	GoogleUpdate.exe
1900	GoogleUpdate.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
4452	cmd.exe
5512	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	GoogleUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gayyy.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	GoogleUpdate.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1332	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
4204	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe
2128	gayyy.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2128	gayyy.exe
Token: SeDebugPrivilege	1760	GoogleUpdate.exe
Token: SeDebugPrivilege	1760	GoogleUpdate.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2128 wrote to memory of 4452	2128	gayyy.exe	90
PID 2128 wrote to memory of 5512	2128	gayyy.exe	92
PID 4452 wrote to memory of 4204	4452	cmd.exe	94
PID 5512 wrote to memory of 1332	5512	cmd.exe	95
PID 5512 wrote to memory of 1900	5512	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\gayyy.exe
"C:\Users\Admin\AppData\Local\Temp\gayyy.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2128
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4452
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "GoogleUpdate" /tr '"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4204
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD83.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5512
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1332
- - C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
    "C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1900

C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
"C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1760

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

tmpD83.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpD83.tmp.bat
Size 155B
SHA256 cc31c6ff001a3a28d2118df19dc04857cd26f1e2196228af0e7090dacd1c909e
MD5 3ba67fad65963deb9d2e21df2ef1001e
SHA1 37b36b55d6bf2140c5a3ddcaeea01ddd988964c0
SHA512 2790f95633d95a815bf79da949e0e8f62649fb7c72b21a7a4fcdb8e0ec8788f4a7c4c95435128e8411e0fd7091cd72739cb3cbc759bca3876985517b41c451b1
TLSH
T1E8C02B5361C9EA2F2805A81713FED4CD91B26C593F44BF00C344841D72C0899F4ED3C2
MD5 SHA1 SHA512 TLSH

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GoogleUpdate.exe

Path C:\Users\Admin\AppData\Roaming\GoogleUpdate.exe
Size 47KB
SHA256 41d7d8d9eef7819dff69c2fe448c4333b9eeeb0d0f4bf86489521abb0ce58d63
MD5 de7e82e617be73ced59585f3dd73b38d
SHA1 7c06d9c7490bed6fe3756c256bdf840ff9242241
SHA512 7bc47849631b32b0ce7efd88ab2a2fc2d3454d448ea38961a0f311c1529146125d7adb3e3418a342fb530d9aecb146c4d71160f16bed3182a03b6ea235c825c1
SSDEEP 768:QuANNTR4ydbWUnrGJmo2q7V/mxZ20tlNPIVJDw1y0bQ6zwuVvE+LPZgQraBDZAx:QuANNTRZ22Q/r0t0VJkNbQ6FVvECPuQf
TLSH
T1E7232C007BE98236F2BE4F74A9F22155867AB2673603D64D2CC441D75A13FC29A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1760-13-0x0000000074410000-0x0000000074BCC000-memory.dmp

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memory/1760-15-0x0000000074410000-0x0000000074BCC000-memory.dmp

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memory/2128-0-0x0000000074622000-0x0000000074623000-memory.dmp

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memory/2128-1-0x0000000000CD0000-0x0000000000CE2000-memory.dmp

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memory/2128-2-0x0000000074610000-0x0000000074DCC000-memory.dmp

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memory/2128-3-0x00000000057C0000-0x0000000005826000-memory.dmp

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memory/2128-4-0x0000000005CA0000-0x0000000005D3C000-memory.dmp

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memory/2128-9-0x0000000074610000-0x0000000074DCC000-memory.dmp

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