asyncrat | 8a42ea3258ea46d5e218afe6d72080d7b7b891175220a1aab084b6a64735c4bd

General

Target

AsyncClient.exe
Size

164KB
MD5

b7a6d85bc95cb3b089057068c30f2d8b
SHA1

864f88d3a1622e8ff48ea48e0c0efb639c079ee8
SHA256

8a42ea3258ea46d5e218afe6d72080d7b7b891175220a1aab084b6a64735c4bd
SHA512

e78f62936c0981a26722c6850f1e4b0e4b3befc8298d34cd0e63ec59615554dea2c402a1b81947e0ca1f9a883a6cacdb9901b02a1b99c371c26588fbdd3d1632
SSDEEP

3072:iuQET/Lm2QskDy3bCgpf1bz8fvFG6GGGGGGGGGGGGGGGGGGG7sGGGGGJFpx:iuQ+TQO3bVhFg9G6GGGGGGGGGGGGGGGl

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

Mutex

O4aZIBt8sGlP

Attributes

delay
3
install
true
install_file
a.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

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral1/files/0x000b00000001225e-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

a.exe

pid	Process
2804	a.exe

Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid	Process
3060	cmd.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 6 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

Processes:

a.exeAsyncClient.execmd.execmd.exetimeout.exeschtasks.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
1580	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

Processes:

schtasks.exe

pid	Process
2588	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

AsyncClient.exe

pid	Process
1664	AsyncClient.exe
1664	AsyncClient.exe
1664	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exea.exe

description	pid	Process
Token: SeDebugPrivilege	1664	AsyncClient.exe
Token: SeDebugPrivilege	2804	a.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 1664 wrote to memory of 2336	1664	AsyncClient.exe	30
PID 1664 wrote to memory of 2336	1664	AsyncClient.exe	30
PID 1664 wrote to memory of 2336	1664	AsyncClient.exe	30
PID 1664 wrote to memory of 2336	1664	AsyncClient.exe	30
PID 1664 wrote to memory of 3060	1664	AsyncClient.exe	32
PID 1664 wrote to memory of 3060	1664	AsyncClient.exe	32
PID 1664 wrote to memory of 3060	1664	AsyncClient.exe	32
PID 1664 wrote to memory of 3060	1664	AsyncClient.exe	32
PID 3060 wrote to memory of 1580	3060	cmd.exe	35
PID 3060 wrote to memory of 1580	3060	cmd.exe	35
PID 3060 wrote to memory of 1580	3060	cmd.exe	35
PID 3060 wrote to memory of 1580	3060	cmd.exe	35
PID 2336 wrote to memory of 2588	2336	cmd.exe	34
PID 2336 wrote to memory of 2588	2336	cmd.exe	34
PID 2336 wrote to memory of 2588	2336	cmd.exe	34
PID 2336 wrote to memory of 2588	2336	cmd.exe	34
PID 3060 wrote to memory of 2804	3060	cmd.exe	37
PID 3060 wrote to memory of 2804	3060	cmd.exe	37
PID 3060 wrote to memory of 2804	3060	cmd.exe	37
PID 3060 wrote to memory of 2804	3060	cmd.exe	37

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:1664
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "a" /tr '"C:\Users\Admin\AppData\Roaming\a.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2336
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "a" /tr '"C:\Users\Admin\AppData\Roaming\a.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2588
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC3FB.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3060
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1580
- - C:\Users\Admin\AppData\Roaming\a.exe
    "C:\Users\Admin\AppData\Roaming\a.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2804

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC3FB.tmp.bat

Filesize
145B

MD5
b2a53919881605b5543510c6213fe643

SHA1
c7a849556fbab648b6b0c3bf0f5f9628ff42936b

SHA256
8b9776ecc8f1ada0f0409e46fc09dda552394a27b1dfe0a6bfe09b75bf32c02f

SHA512
8540f8cc0a532961e80b5717f3dff73c094ed2eb4d8c5c2cc45ee4c5403a2d7fc306e10c2da23cca8bace5ee52effff5b5a4eed3ae5ec6bdb5186cc8787a10ab

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

Filesize
164KB

MD5
b7a6d85bc95cb3b089057068c30f2d8b

SHA1
864f88d3a1622e8ff48ea48e0c0efb639c079ee8

SHA256
8a42ea3258ea46d5e218afe6d72080d7b7b891175220a1aab084b6a64735c4bd

SHA512
e78f62936c0981a26722c6850f1e4b0e4b3befc8298d34cd0e63ec59615554dea2c402a1b81947e0ca1f9a883a6cacdb9901b02a1b99c371c26588fbdd3d1632

Download Submit
memory/1664-0-0x000000007468E000-0x000000007468F000-memory.dmp

Filesize
4KB

Download
memory/1664-1-0x0000000000C90000-0x0000000000CC0000-memory.dmp

Filesize
192KB

Download
memory/1664-2-0x0000000074680000-0x0000000074D6E000-memory.dmp

Filesize
6.9MB

Download
memory/1664-11-0x0000000074680000-0x0000000074D6E000-memory.dmp

Filesize
6.9MB

Download
memory/2804-16-0x0000000000F50000-0x0000000000F80000-memory.dmp

Filesize
192KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads