asyncrat | 5cd5530ea7aea507cb7faf6f9049448252aebd2cd4a4ecd7f040a1c44274dbaf

General

Target

AsyncClient.exe
Size

59KB
MD5

7ffbcac612bf8f2c14d872af7e7c68a0
SHA1

46f7f128b782946f0ad74ed4a278a4c266e3ed5d
SHA256

5cd5530ea7aea507cb7faf6f9049448252aebd2cd4a4ecd7f040a1c44274dbaf
SHA512

4428df372dc50d285630883afec00fb375245ea52b36db976eadc513669d438e4eb398153e5f1317db8c92fd59cc418cafedc57db97b52b23190a11c0e4d71ad
SSDEEP

1536:8uk7VT0M912CVcPpD4zbkhc+eaT9VCbAHdMn25FyX/oah:8ukJT0ML2YcPizbk/998CK2P6/oah

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

127.0.0.1:2020

Mutex

oOcKCLkOWt6j

Attributes

delay
3
install
true
install_file
Roblox.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
behavioral1/files/0x0005000000010300-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2812	Roblox.exe

Loads dropped DLL 1 IoCs

pid	Process
2552	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

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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2752	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
2664	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2640	AsyncClient.exe
2640	AsyncClient.exe
2640	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2640	AsyncClient.exe
Token: SeDebugPrivilege	2812	Roblox.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2640 wrote to memory of 2852	2640	AsyncClient.exe	30
PID 2640 wrote to memory of 2852	2640	AsyncClient.exe	30
PID 2640 wrote to memory of 2852	2640	AsyncClient.exe	30
PID 2640 wrote to memory of 2852	2640	AsyncClient.exe	30
PID 2640 wrote to memory of 2552	2640	AsyncClient.exe	32
PID 2640 wrote to memory of 2552	2640	AsyncClient.exe	32
PID 2640 wrote to memory of 2552	2640	AsyncClient.exe	32
PID 2640 wrote to memory of 2552	2640	AsyncClient.exe	32
PID 2852 wrote to memory of 2664	2852	cmd.exe	33
PID 2852 wrote to memory of 2664	2852	cmd.exe	33
PID 2852 wrote to memory of 2664	2852	cmd.exe	33
PID 2852 wrote to memory of 2664	2852	cmd.exe	33
PID 2552 wrote to memory of 2752	2552	cmd.exe	35
PID 2552 wrote to memory of 2752	2552	cmd.exe	35
PID 2552 wrote to memory of 2752	2552	cmd.exe	35
PID 2552 wrote to memory of 2752	2552	cmd.exe	35
PID 2552 wrote to memory of 2812	2552	cmd.exe	36
PID 2552 wrote to memory of 2812	2552	cmd.exe	36
PID 2552 wrote to memory of 2812	2552	cmd.exe	36
PID 2552 wrote to memory of 2812	2552	cmd.exe	36

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:2640
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Roblox" /tr '"C:\Users\Admin\AppData\Roaming\Roblox.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2852
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Roblox" /tr '"C:\Users\Admin\AppData\Roaming\Roblox.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2664
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp2EAE.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2552
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2752
- - C:\Users\Admin\AppData\Roaming\Roblox.exe
    "C:\Users\Admin\AppData\Roaming\Roblox.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2812

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\tmp2EAE.tmp.bat

Filesize
150B

MD5
c3df659f07434cec42fe8ea258564ec7

SHA1
f33d41a548a7b9dc0b0c76c4cadbcbf2e7d2e591

SHA256
58b928792a81496976bb7a7584ad48d7c45ff4b7dc3ba3f05999dbdb42cb86f1

SHA512
d6742be167a61c21115ff5996319720db78a1b3ab4d07b279d807673bc75f21b302e586c7946315d3274126528da3000020ab585423d58822470e8ba57e59057

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

Filesize
59KB

MD5
7ffbcac612bf8f2c14d872af7e7c68a0

SHA1
46f7f128b782946f0ad74ed4a278a4c266e3ed5d

SHA256
5cd5530ea7aea507cb7faf6f9049448252aebd2cd4a4ecd7f040a1c44274dbaf

SHA512
4428df372dc50d285630883afec00fb375245ea52b36db976eadc513669d438e4eb398153e5f1317db8c92fd59cc418cafedc57db97b52b23190a11c0e4d71ad

Download Submit
memory/2640-0-0x000000007495E000-0x000000007495F000-memory.dmp

Filesize
4KB

Download
memory/2640-1-0x0000000001280000-0x0000000001294000-memory.dmp

Filesize
80KB

Download
memory/2640-2-0x0000000074950000-0x000000007503E000-memory.dmp

Filesize
6.9MB

Download
memory/2640-11-0x0000000074950000-0x000000007503E000-memory.dmp

Filesize
6.9MB

Download
memory/2812-16-0x0000000000FC0000-0x0000000000FD4000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads