asyncrat | d21a63a1bcc5afdc0eb4b00e6b82af4bdf1f634e50d0d51001a4c27ac7f84379

Analysis

max time kernel
118s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
01-12-2024 10:31

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General

Target

1E45D6ABB8FA749D0FDE3EADD586E637.exe
Size

258KB
MD5

1e45d6abb8fa749d0fde3eadd586e637
SHA1

4a961b4a92fa3fb1265f729d18f2f0638cba018a
SHA256

d21a63a1bcc5afdc0eb4b00e6b82af4bdf1f634e50d0d51001a4c27ac7f84379
SHA512

58f30c478856230c16ae7bb8425e32e0dce23d927de1d7d4697400617609a3f5dfd9ceca98426b05e240ae515ba5408af569714c9d95e17652c0e83406762900
SSDEEP

3072:Xxjla5113NyCzPWYykCbXCfe8jtgszyAVibmbJ30U11xjZjsDQBxQh68:XZla513yAykOyG2gszyjm1EUTEDO

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

2.56.179.212:4445

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
THK.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

Executes dropped EXE 2 IoCs

pid	Process
2792	THK.exe
2148	THK.exe

Loads dropped DLL 1 IoCs

pid	Process
2716	cmd.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1976 set thread context of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 2792 set thread context of 2148	2792	THK.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 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	THK.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	THK.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1E45D6ABB8FA749D0FDE3EADD586E637.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1E45D6ABB8FA749D0FDE3EADD586E637.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2720	timeout.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
2908	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe
2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe
Token: SeDebugPrivilege	2148	THK.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 1976 wrote to memory of 2368	1976	1E45D6ABB8FA749D0FDE3EADD586E637.exe	30
PID 2368 wrote to memory of 2888	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	31
PID 2368 wrote to memory of 2888	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	31
PID 2368 wrote to memory of 2888	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	31
PID 2368 wrote to memory of 2888	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	31
PID 2368 wrote to memory of 2716	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	33
PID 2368 wrote to memory of 2716	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	33
PID 2368 wrote to memory of 2716	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	33
PID 2368 wrote to memory of 2716	2368	1E45D6ABB8FA749D0FDE3EADD586E637.exe	33
PID 2716 wrote to memory of 2720	2716	cmd.exe	35
PID 2716 wrote to memory of 2720	2716	cmd.exe	35
PID 2716 wrote to memory of 2720	2716	cmd.exe	35
PID 2716 wrote to memory of 2720	2716	cmd.exe	35
PID 2888 wrote to memory of 2908	2888	cmd.exe	36
PID 2888 wrote to memory of 2908	2888	cmd.exe	36
PID 2888 wrote to memory of 2908	2888	cmd.exe	36
PID 2888 wrote to memory of 2908	2888	cmd.exe	36
PID 2716 wrote to memory of 2792	2716	cmd.exe	37
PID 2716 wrote to memory of 2792	2716	cmd.exe	37
PID 2716 wrote to memory of 2792	2716	cmd.exe	37
PID 2716 wrote to memory of 2792	2716	cmd.exe	37
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38
PID 2792 wrote to memory of 2148	2792	THK.exe	38

C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe
"C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1976
- C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe
  "C:\Users\Admin\AppData\Local\Temp\1E45D6ABB8FA749D0FDE3EADD586E637.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2368
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "THK" /tr '"C:\Users\Admin\AppData\Roaming\THK.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2888
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "THK" /tr '"C:\Users\Admin\AppData\Roaming\THK.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2908
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpB6F0.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2716
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2720
  - - C:\Users\Admin\AppData\Roaming\THK.exe
      "C:\Users\Admin\AppData\Roaming\THK.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2792
    - - C:\Users\Admin\AppData\Roaming\THK.exe
        
        "C:\Users\Admin\AppData\Roaming\THK.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:2148

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

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\CabD23F.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB6F0.tmp.bat

Filesize
147B

MD5
79f5749a19a41c2d9a54d5bb644c4fe0

SHA1
eecb53a70e48cabb6907ef5f5047e9f75e00a75e

SHA256
3b903bebb49279b4b28ad813aa77764a10d44105cc0735bd8a5bd6282621326b

SHA512
32c7bb1a76e4c79b8b453fe95d5e731e7134decce5c432f13fd6151884b2551fbb66d06db4b309523c81f6f8d4c6378bee1c3a9f1864b2e6822ce51359c7aa04

Download Submit
\Users\Admin\AppData\Roaming\THK.exe

Filesize
258KB

MD5
1e45d6abb8fa749d0fde3eadd586e637

SHA1
4a961b4a92fa3fb1265f729d18f2f0638cba018a

SHA256
d21a63a1bcc5afdc0eb4b00e6b82af4bdf1f634e50d0d51001a4c27ac7f84379

SHA512
58f30c478856230c16ae7bb8425e32e0dce23d927de1d7d4697400617609a3f5dfd9ceca98426b05e240ae515ba5408af569714c9d95e17652c0e83406762900

Download Submit
memory/1976-15-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/1976-1-0x0000000000270000-0x00000000002B6000-memory.dmp

Filesize
280KB

Download
memory/1976-2-0x0000000000390000-0x00000000003A8000-memory.dmp

Filesize
96KB

Download
memory/1976-0-0x000000007411E000-0x000000007411F000-memory.dmp

Filesize
4KB

Download
memory/1976-17-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/2148-41-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2148-44-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2148-46-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-7-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2368-16-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/2368-4-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-18-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/2368-5-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-27-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/2368-6-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-11-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-14-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-9-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2368-3-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2792-32-0x0000000001200000-0x0000000001246000-memory.dmp

Filesize
280KB

Download