asyncrat | c84a91d4261563b4171103a1d72a3f86f48ec2eaca6e43d7f217bdcbc877124d

Analysis

max time kernel
138s
max time network
149s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
13-12-2024 10:30

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General

Target

AsyncClient.exe
Size

47KB
MD5

da0c2ab9e92a4d36b177ae380e91feda
SHA1

44fb185950925ca2fcb469fbedaceee0a451cbca
SHA256

c84a91d4261563b4171103a1d72a3f86f48ec2eaca6e43d7f217bdcbc877124d
SHA512

0fc9a2f7cd1924578ed0840205162c19bcc67ad602321461d74d817344436f778d6fe54cc91f795cbed6decd65dc4d8bbc17ef969af7dd5feafec9bd7fcc1e7e
SSDEEP

768:ku/dRTUo0HQbWUnmjSmo2qMOdvbvAaQ9+EUMpPPI4/AWXXz0bjx+IBE8IIC6sGBo:ku/dRTUPE2ovbVWSQAWXX4bjgF8AIdgx

Score

10^/10

asyncrat default discovery execution persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

82.64.156.123:80

Mutex

9mzImB3NUR0Q

Attributes

delay
3
install
false
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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Active Setup\Installed Components	explorer.exe

Executes dropped EXE 2 IoCs

pid	Process
2716	zreodn.exe
1944	zreodn.exe

Loads dropped DLL 2 IoCs

pid	Process
1676	powershell.exe
2716	zreodn.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
10	checkip.dyndns.org

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Start PowerShell.

execution

PowerShell

T1059.001

pid	Process
1676	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2716 set thread context of 1944	2716	zreodn.exe	38

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 5 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zreodn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	zreodn.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	explorer.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1676	powershell.exe
1676	powershell.exe
1676	powershell.exe
2464	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 15 IoCs

description	pid	Process
Token: SeDebugPrivilege	2464	AsyncClient.exe
Token: SeDebugPrivilege	1676	powershell.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeDebugPrivilege	1944	zreodn.exe
Token: SeShutdownPrivilege	3020	explorer.exe
Token: SeShutdownPrivilege	3020	explorer.exe

Suspicious use of FindShellTrayWindow 27 IoCs

pid	Process
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe

Suspicious use of SendNotifyMessage 16 IoCs

pid	Process
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe
3020	explorer.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2464 wrote to memory of 2968	2464	AsyncClient.exe	32
PID 2464 wrote to memory of 2968	2464	AsyncClient.exe	32
PID 2464 wrote to memory of 2968	2464	AsyncClient.exe	32
PID 2464 wrote to memory of 2968	2464	AsyncClient.exe	32
PID 2968 wrote to memory of 1676	2968	cmd.exe	34
PID 2968 wrote to memory of 1676	2968	cmd.exe	34
PID 2968 wrote to memory of 1676	2968	cmd.exe	34
PID 2968 wrote to memory of 1676	2968	cmd.exe	34
PID 1676 wrote to memory of 2716	1676	powershell.exe	35
PID 1676 wrote to memory of 2716	1676	powershell.exe	35
PID 1676 wrote to memory of 2716	1676	powershell.exe	35
PID 1676 wrote to memory of 2716	1676	powershell.exe	35
PID 2716 wrote to memory of 3020	2716	zreodn.exe	36
PID 2716 wrote to memory of 3020	2716	zreodn.exe	36
PID 2716 wrote to memory of 3020	2716	zreodn.exe	36
PID 2716 wrote to memory of 3020	2716	zreodn.exe	36
PID 3020 wrote to memory of 2848	3020	explorer.exe	37
PID 3020 wrote to memory of 2848	3020	explorer.exe	37
PID 3020 wrote to memory of 2848	3020	explorer.exe	37
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38
PID 2716 wrote to memory of 1944	2716	zreodn.exe	38

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2464
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\zreodn.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2968
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\zreodn.exe"'
    3⤵
    - Loads dropped DLL
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1676
  - - C:\Users\Admin\AppData\Local\Temp\zreodn.exe
      "C:\Users\Admin\AppData\Local\Temp\zreodn.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2716
    - - C:\Windows\explorer.exe
        
        "C:\Windows\explorer.exe"
        5⤵
        Boot or Logon Autostart Execution: Active Setup
        Modifies registry class
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of FindShellTrayWindow
        Suspicious use of SendNotifyMessage
        Suspicious use of WriteProcessMemory
        
        PID:3020
      - C:\Windows\system32\ctfmon.exe
        
        ctfmon.exe
        6⤵
        
        PID:2848
    - - C:\Users\Admin\AppData\Local\Temp\zreodn.exe
        
        "C:\Users\Admin\AppData\Local\Temp\zreodn.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:1944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Defense Evasion

Modify Registry

T1112

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabF884.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarC26.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\zreodn.exe

Filesize
701KB

MD5
5890798f97f9144206499433a5db3011

SHA1
1c9c488123a81bf8d2216ac57c089e056f899433

SHA256
69be5428a0e939a5bf4453b34aad1a86791ab75411b6a339d727197f82bc8411

SHA512
964f340060a67abed11d06ac40cb8cb2577f985e8815cc12f306e37a716792ae8edac02645d0cddeea5d81f72ef402363c909b6f510eb2a37c76f1cf56caada9

Download Submit
memory/1944-58-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/1944-61-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/1944-60-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/1944-51-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/1944-53-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/1944-55-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/1944-57-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/1944-49-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2464-19-0x0000000004270000-0x00000000042D2000-memory.dmp

Filesize
392KB

Download
memory/2464-47-0x0000000073F80000-0x000000007466E000-memory.dmp

Filesize
6.9MB

Download
memory/2464-20-0x0000000073F8E000-0x0000000073F8F000-memory.dmp

Filesize
4KB

Download
memory/2464-0-0x0000000073F8E000-0x0000000073F8F000-memory.dmp

Filesize
4KB

Download
memory/2464-2-0x0000000073F80000-0x000000007466E000-memory.dmp

Filesize
6.9MB

Download
memory/2464-1-0x0000000000D00000-0x0000000000D12000-memory.dmp

Filesize
72KB

Download
memory/2716-45-0x0000000001260000-0x0000000001316000-memory.dmp

Filesize
728KB

Download
memory/3020-68-0x0000000004050000-0x0000000004060000-memory.dmp

Filesize
64KB

Download