asyncrat | 24fa23a1908d5afe4a323872a2df703ecdc1fe033d321423c6c60f983d8d1f6e

General

Target

AsyncClient.exe
Size

45KB
MD5

2f0206e9dd15d9dccb2ecf93e7cf8ce8
SHA1

48223ea372b29b082e8f44c610ffc0edd88ed2ae
SHA256

24fa23a1908d5afe4a323872a2df703ecdc1fe033d321423c6c60f983d8d1f6e
SHA512

0790798f4a11cbf09c2a1dc74ef92c1b2f84c3b659efec9df9099a1eaab9c6a00c430c8316aaefa94da206b589741c45e7f0bf56cd3b58e8e43f8a8130ff8160
SSDEEP

768:puwpFTAY3IQWUe9jqmo2qLoKjPGaG6PIyzjbFgX3i+7Qs0M48wDdOTwBDZ6x:puwpFTA4/2xKTkDy3bCXS+cs07tgmd6x

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

ZC7aTuQsZ3YU

Attributes

delay
3
install
true
install_file
new rat.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/0x00090000000120fa-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1544	new rat.exe

Loads dropped DLL 1 IoCs

pid	Process
1928	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	new rat.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2436	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
808	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1768	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1768	AsyncClient.exe
Token: SeDebugPrivilege	1544	new rat.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1768 wrote to memory of 2172	1768	AsyncClient.exe	29
PID 1768 wrote to memory of 2172	1768	AsyncClient.exe	29
PID 1768 wrote to memory of 2172	1768	AsyncClient.exe	29
PID 1768 wrote to memory of 2172	1768	AsyncClient.exe	29
PID 1768 wrote to memory of 1928	1768	AsyncClient.exe	31
PID 1768 wrote to memory of 1928	1768	AsyncClient.exe	31
PID 1768 wrote to memory of 1928	1768	AsyncClient.exe	31
PID 1768 wrote to memory of 1928	1768	AsyncClient.exe	31
PID 2172 wrote to memory of 808	2172	cmd.exe	33
PID 2172 wrote to memory of 808	2172	cmd.exe	33
PID 2172 wrote to memory of 808	2172	cmd.exe	33
PID 2172 wrote to memory of 808	2172	cmd.exe	33
PID 1928 wrote to memory of 2436	1928	cmd.exe	34
PID 1928 wrote to memory of 2436	1928	cmd.exe	34
PID 1928 wrote to memory of 2436	1928	cmd.exe	34
PID 1928 wrote to memory of 2436	1928	cmd.exe	34
PID 1928 wrote to memory of 1544	1928	cmd.exe	35
PID 1928 wrote to memory of 1544	1928	cmd.exe	35
PID 1928 wrote to memory of 1544	1928	cmd.exe	35
PID 1928 wrote to memory of 1544	1928	cmd.exe	35

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:1768
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "new rat" /tr '"C:\Users\Admin\AppData\Roaming\new rat.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2172
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "new rat" /tr '"C:\Users\Admin\AppData\Roaming\new rat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:808
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp51F7.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1928
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2436
- - C:\Users\Admin\AppData\Roaming\new rat.exe
    "C:\Users\Admin\AppData\Roaming\new rat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1544

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\tmp51F7.tmp.bat

Filesize
151B

MD5
f04dd6590af4a46920038e332b131375

SHA1
74353f52db5784fa0d6153a3677be631140750be

SHA256
479fc5a94841d0942dbfaeb4fade7aef302724a08259cc25bd724afa7724902c

SHA512
c2bb3bb7ea954c46ad55bf3637353209bc0923df88e91f3ef3acdb8b988a626a3eb0cdd43909b27029aaf111cb13431acb77ad0f2ce57b2a95a4f7c51f6990ba

Download Submit
\Users\Admin\AppData\Roaming\new rat.exe

Filesize
45KB

MD5
2f0206e9dd15d9dccb2ecf93e7cf8ce8

SHA1
48223ea372b29b082e8f44c610ffc0edd88ed2ae

SHA256
24fa23a1908d5afe4a323872a2df703ecdc1fe033d321423c6c60f983d8d1f6e

SHA512
0790798f4a11cbf09c2a1dc74ef92c1b2f84c3b659efec9df9099a1eaab9c6a00c430c8316aaefa94da206b589741c45e7f0bf56cd3b58e8e43f8a8130ff8160

Download Submit
memory/1544-16-0x0000000000C30000-0x0000000000C42000-memory.dmp

Filesize
72KB

Download
memory/1768-0-0x0000000073B9E000-0x0000000073B9F000-memory.dmp

Filesize
4KB

Download
memory/1768-1-0x0000000000EA0000-0x0000000000EB2000-memory.dmp

Filesize
72KB

Download
memory/1768-2-0x0000000073B90000-0x000000007427E000-memory.dmp

Filesize
6.9MB

Download
memory/1768-11-0x0000000073B90000-0x000000007427E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads