asyncrat | 3cdc01d09e12d2e7c72ca0991a56f9aa4c9709ee6b12e4e364ca20667ad86783

Analysis

max time kernel
46s
max time network
34s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
17-08-2024 17:50

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General

Target

AsyncClient.exe
Size

47KB
MD5

a586c51839e644019d5c158cf39238bf
SHA1

273906fe2786f3b5ef465709e77f87f68a7152d6
SHA256

3cdc01d09e12d2e7c72ca0991a56f9aa4c9709ee6b12e4e364ca20667ad86783
SHA512

205cf606dbdc6cb8405480d072d2dafe0cb8db1e5075435e57656da2120a414e1c941f6314308639d66865dbc9559154901b6e10bf34f2214fadc77203ddf741
SSDEEP

768:Mu0OVT0kWNnWUb11lmo2qjsFssCHSruo3yVr0CFPIadzYfMblJU0bK19u9Nq+ckT:Mu0OVT01r2BSD+yiadzDZ1bq9u7YkZEq

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

wome-45459.portmap.host:45459

wome-45459.portmap.host:9999

Mutex

1JewM1Y7Ickf

Attributes

delay
3
install
true
install_file
OperaGXUpdater.exe
install_folder
%AppData%

aes.plain

Signatures

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/0x0003000000022ab2-11.dat	family_asyncrat

Checks computer location settings 2 TTPs 2 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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	AsyncClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	OperaGXUpdater.exe

Executes dropped EXE 1 IoCs

pid	Process
2144	OperaGXUpdater.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 8 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	OperaGXUpdater.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	shutdown.exe
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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4500	timeout.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	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\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\ColorizationAfterglowBalance = "10"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
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\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "200"	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\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.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
3040	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe
3340	AsyncClient.exe

Suspicious behavior: LoadsDriver 64 IoCs

pid	Process
4	Process not Found
4	Process not Found
4	Process not Found
4	Process not Found
4	Process not Found
652	Process not Found
4384	Process not Found
908	Process not Found
2520	Process not Found
4664	Process not Found
1108	Process not Found
3556	Process not Found
3728	Process not Found
4888	Process not Found
1612	Process not Found
3812	Process not Found
4616	Process not Found
4216	Process not Found
2656	Process not Found
3780	Process not Found
2500	Process not Found
4456	Process not Found
3644	Process not Found
4492	Process not Found
4412	Process not Found
3532	Process not Found
1316	Process not Found
1260	Process not Found
1328	Process not Found
1956	Process not Found
4600	Process not Found
4276	Process not Found
220	Process not Found
4656	Process not Found
3400	Process not Found
3632	Process not Found
3760	Process not Found
3248	Process not Found
3924	Process not Found
3944	Process not Found
1624	Process not Found
3920	Process not Found
2476	Process not Found
5104	Process not Found
3896	Process not Found
3344	Process not Found
3000	Process not Found
2472	Process not Found
3912	Process not Found
4668	Process not Found
4120	Process not Found
3516	Process not Found
5000	Process not Found
4588	Process not Found
864	Process not Found
2972	Process not Found
1844	Process not Found
348	Process not Found
1424	Process not Found
4748	Process not Found
408	Process not Found
4736	Process not Found
4472	Process not Found
4016	Process not Found

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3340	AsyncClient.exe
Token: SeDebugPrivilege	2144	OperaGXUpdater.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
212	LogonUI.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3340 wrote to memory of 1604	3340	AsyncClient.exe	93
PID 3340 wrote to memory of 1604	3340	AsyncClient.exe	93
PID 3340 wrote to memory of 1604	3340	AsyncClient.exe	93
PID 3340 wrote to memory of 3824	3340	AsyncClient.exe	95
PID 3340 wrote to memory of 3824	3340	AsyncClient.exe	95
PID 3340 wrote to memory of 3824	3340	AsyncClient.exe	95
PID 1604 wrote to memory of 3040	1604	cmd.exe	97
PID 1604 wrote to memory of 3040	1604	cmd.exe	97
PID 1604 wrote to memory of 3040	1604	cmd.exe	97
PID 3824 wrote to memory of 4500	3824	cmd.exe	98
PID 3824 wrote to memory of 4500	3824	cmd.exe	98
PID 3824 wrote to memory of 4500	3824	cmd.exe	98
PID 3824 wrote to memory of 2144	3824	cmd.exe	99
PID 3824 wrote to memory of 2144	3824	cmd.exe	99
PID 3824 wrote to memory of 2144	3824	cmd.exe	99
PID 2144 wrote to memory of 3760	2144	OperaGXUpdater.exe	109
PID 2144 wrote to memory of 3760	2144	OperaGXUpdater.exe	109
PID 2144 wrote to memory of 3760	2144	OperaGXUpdater.exe	109
PID 3760 wrote to memory of 1116	3760	cmd.exe	111
PID 3760 wrote to memory of 1116	3760	cmd.exe	111
PID 3760 wrote to memory of 1116	3760	cmd.exe	111

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "OperaGXUpdater" /tr '"C:\Users\Admin\AppData\Roaming\OperaGXUpdater.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1604
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "OperaGXUpdater" /tr '"C:\Users\Admin\AppData\Roaming\OperaGXUpdater.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3040
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9B17.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3824
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4500
- - C:\Users\Admin\AppData\Roaming\OperaGXUpdater.exe
    "C:\Users\Admin\AppData\Roaming\OperaGXUpdater.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2144
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c Shutdown /l /f
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:3760
    - - C:\Windows\SysWOW64\shutdown.exe
        
        Shutdown /l /f
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:1116

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3953855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:212

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Query Registry

T1012

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

C:\Users\Admin\AppData\Local\Temp\tmp9B17.tmp.bat

Filesize
158B

MD5
facdbdf64b1ef086a9853033fdbd1bf9

SHA1
92ed507647e031afb2328aaedf30a96fe1dd0b53

SHA256
3e9b1536f2abfaaa5a3932ad02817826bb2baf906b4c3de417fc44c4d688382e

SHA512
9a32b730b4ead059ad4ec028222438367c39996d181b513a3ef1f01ae571844d29588ca5ee60a15df3d733217687d43b30d4b12e531a896db157a393fec3af2c

Download Submit
C:\Users\Admin\AppData\Roaming\OperaGXUpdater.exe

Filesize
47KB

MD5
a586c51839e644019d5c158cf39238bf

SHA1
273906fe2786f3b5ef465709e77f87f68a7152d6

SHA256
3cdc01d09e12d2e7c72ca0991a56f9aa4c9709ee6b12e4e364ca20667ad86783

SHA512
205cf606dbdc6cb8405480d072d2dafe0cb8db1e5075435e57656da2120a414e1c941f6314308639d66865dbc9559154901b6e10bf34f2214fadc77203ddf741

Download Submit
memory/2144-17-0x0000000005C40000-0x0000000005CA6000-memory.dmp

Filesize
408KB

Download
memory/2144-13-0x0000000074E00000-0x00000000755B0000-memory.dmp

Filesize
7.7MB

Download
memory/2144-16-0x0000000006130000-0x00000000066D4000-memory.dmp

Filesize
5.6MB

Download
memory/2144-18-0x0000000074E00000-0x00000000755B0000-memory.dmp

Filesize
7.7MB

Download
memory/2144-19-0x0000000006CE0000-0x0000000006D56000-memory.dmp

Filesize
472KB

Download
memory/2144-20-0x0000000006C60000-0x0000000006CC4000-memory.dmp

Filesize
400KB

Download
memory/2144-21-0x0000000006DA0000-0x0000000006DBE000-memory.dmp

Filesize
120KB

Download
memory/2144-22-0x0000000074E00000-0x00000000755B0000-memory.dmp

Filesize
7.7MB

Download
memory/3340-3-0x0000000005450000-0x00000000054EC000-memory.dmp

Filesize
624KB

Download
memory/3340-8-0x0000000074E90000-0x0000000075640000-memory.dmp

Filesize
7.7MB

Download
memory/3340-2-0x0000000074E90000-0x0000000075640000-memory.dmp

Filesize
7.7MB

Download
memory/3340-1-0x0000000000AA0000-0x0000000000AB2000-memory.dmp

Filesize
72KB

Download
memory/3340-0-0x0000000074E9E000-0x0000000074E9F000-memory.dmp

Filesize
4KB

Download