asyncrat | 8f0f590c8a0d635016a9c1464d099c8eda20eed012fe4f6ee6bb117d92fa2c7b

Reason

Machine shutdown

General

Target

AsyncClient.exe
Size

47KB
MD5

f9253eafbd6718a759325e873cf8f6b8
SHA1

7cdd0ccbf4940d255952996a444c5d4fd928eb1a
SHA256

8f0f590c8a0d635016a9c1464d099c8eda20eed012fe4f6ee6bb117d92fa2c7b
SHA512

b47d2449fa76f62128d5a918db882e0de3c46f4fad2a3302175d778519b32bb1871d41a249b169bd26215ef4330a67da85ebfe27b68be11337d7adb736306cc6
SSDEEP

768:NuI1tT/w70kWUquzumo2qzhcWItdiBWmPI86Fr/0bJtzKQFmGcQ6BwKmayBDZYx:NuI1tT/kW2acWrBY8YcbJtzK275VdYx

Score

10^/10

asyncrat steam discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Steam

C2

77.100.63.251:5631

Mutex

P1D9ySnUAXPA

Attributes

delay
3
install
false
install_file
Steam.exe
install_folder
%AppData%

aes.plain

Signatures

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

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-1-5-21-3181990009-820930284-137514597-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 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	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	shutdown.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "19"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3840	AsyncClient.exe
Token: SeShutdownPrivilege	4740	shutdown.exe
Token: SeRemoteShutdownPrivilege	4740	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3516	LogonUI.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3840 wrote to memory of 4772	3840	AsyncClient.exe	114
PID 3840 wrote to memory of 4772	3840	AsyncClient.exe	114
PID 3840 wrote to memory of 4772	3840	AsyncClient.exe	114
PID 4772 wrote to memory of 4740	4772	cmd.exe	116
PID 4772 wrote to memory of 4740	4772	cmd.exe	116
PID 4772 wrote to memory of 4740	4772	cmd.exe	116

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3840
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c Shutdown /r /f /t 00
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4772
- - C:\Windows\SysWOW64\shutdown.exe
    Shutdown /r /f /t 00
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4740

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa390f055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3516

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3840-0-0x0000000074E2E000-0x0000000074E2F000-memory.dmp

Filesize
4KB

Download
memory/3840-1-0x0000000000E90000-0x0000000000EA2000-memory.dmp

Filesize
72KB

Download
memory/3840-2-0x0000000074E20000-0x00000000755D0000-memory.dmp

Filesize
7.7MB

Download
memory/3840-5-0x0000000006270000-0x000000000630C000-memory.dmp

Filesize
624KB

Download
memory/3840-6-0x00000000068C0000-0x0000000006E64000-memory.dmp

Filesize
5.6MB

Download
memory/3840-7-0x0000000005D70000-0x0000000005DD6000-memory.dmp

Filesize
408KB

Download
memory/3840-8-0x0000000074E2E000-0x0000000074E2F000-memory.dmp

Filesize
4KB

Download
memory/3840-9-0x0000000074E20000-0x00000000755D0000-memory.dmp

Filesize
7.7MB

Download
memory/3840-11-0x0000000006720000-0x0000000006788000-memory.dmp

Filesize
416KB

Download
memory/3840-10-0x00000000067A0000-0x0000000006816000-memory.dmp

Filesize
472KB

Download
memory/3840-12-0x0000000006840000-0x000000000685E000-memory.dmp

Filesize
120KB

Download
memory/3840-13-0x00000000070E0000-0x0000000007172000-memory.dmp

Filesize
584KB

Download
memory/3840-14-0x0000000007520000-0x0000000007584000-memory.dmp

Filesize
400KB

Download
memory/3840-15-0x0000000074E20000-0x00000000755D0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

Errors