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/0x0008000000012118-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2716	new rat.exe

Loads dropped DLL 1 IoCs

pid	Process
2112	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	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	new rat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2584	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
1812	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2644	AsyncClient.exe
2644	AsyncClient.exe
2644	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2644	AsyncClient.exe
Token: SeDebugPrivilege	2716	new rat.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 2792	2644	AsyncClient.exe	31
PID 2644 wrote to memory of 2792	2644	AsyncClient.exe	31
PID 2644 wrote to memory of 2792	2644	AsyncClient.exe	31
PID 2644 wrote to memory of 2792	2644	AsyncClient.exe	31
PID 2644 wrote to memory of 2112	2644	AsyncClient.exe	33
PID 2644 wrote to memory of 2112	2644	AsyncClient.exe	33
PID 2644 wrote to memory of 2112	2644	AsyncClient.exe	33
PID 2644 wrote to memory of 2112	2644	AsyncClient.exe	33
PID 2112 wrote to memory of 2584	2112	cmd.exe	36
PID 2112 wrote to memory of 2584	2112	cmd.exe	36
PID 2112 wrote to memory of 2584	2112	cmd.exe	36
PID 2112 wrote to memory of 2584	2112	cmd.exe	36
PID 2792 wrote to memory of 1812	2792	cmd.exe	35
PID 2792 wrote to memory of 1812	2792	cmd.exe	35
PID 2792 wrote to memory of 1812	2792	cmd.exe	35
PID 2792 wrote to memory of 1812	2792	cmd.exe	35
PID 2112 wrote to memory of 2716	2112	cmd.exe	37
PID 2112 wrote to memory of 2716	2112	cmd.exe	37
PID 2112 wrote to memory of 2716	2112	cmd.exe	37
PID 2112 wrote to memory of 2716	2112	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:2644
- 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:2792
- - 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:1812
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF5F3.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2112
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2584
- - 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:2716

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\tmpF5F3.tmp.bat

Filesize
151B

MD5
93823e809290cab543c69cce9769cd77

SHA1
1b637be5fccb51c26db3589952d07c04b22b4637

SHA256
544640e2352d8cc71ea1ba2388f02b8160c6301310a89c7dcd0c6c78849d4a3d

SHA512
0bc23c6efc449d3b2af4491a3b6d80b492978135a940adfa91b5f2a96e0ae66af4dacb0b44987ee508525c86d993be6cf034d2333773e5191b10ce0d648c38ba

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

Filesize
45KB

MD5
2f0206e9dd15d9dccb2ecf93e7cf8ce8

SHA1
48223ea372b29b082e8f44c610ffc0edd88ed2ae

SHA256
24fa23a1908d5afe4a323872a2df703ecdc1fe033d321423c6c60f983d8d1f6e

SHA512
0790798f4a11cbf09c2a1dc74ef92c1b2f84c3b659efec9df9099a1eaab9c6a00c430c8316aaefa94da206b589741c45e7f0bf56cd3b58e8e43f8a8130ff8160

Download Submit
memory/2644-0-0x000000007462E000-0x000000007462F000-memory.dmp

Filesize
4KB

Download
memory/2644-1-0x0000000000E10000-0x0000000000E22000-memory.dmp

Filesize
72KB

Download
memory/2644-2-0x0000000074620000-0x0000000074D0E000-memory.dmp

Filesize
6.9MB

Download
memory/2644-12-0x0000000074620000-0x0000000074D0E000-memory.dmp

Filesize
6.9MB

Download
memory/2716-16-0x0000000000D30000-0x0000000000D42000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads