asyncrat | f383a6ec81b2cc2c6f76d35d63c6d63e927e52d4b35e7fe4e1974eda71fe3331

General

Target

AsyncClient.exe
Size

72KB
MD5

4e6add4d01c71b6da1b1ef92ece5e4d9
SHA1

119c4d128e6a0bc216d724de3cae474b236be3a9
SHA256

f383a6ec81b2cc2c6f76d35d63c6d63e927e52d4b35e7fe4e1974eda71fe3331
SHA512

002e6b5665cd901eeb4ad21271dc59ba2b028ef234d41c4f391a08f3c7d7da58f1ce4645c78b7d015ed9c967a0fb0fab6489df8d12f6edeedcb991d97724238d
SSDEEP

1536:Qum81TQq72dKTkDy3bCXSNqEoldZeZ5/EAH5Bx:QumoTQq72dskDy3bCZ5lHoltHPx

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

192.168.40.78:6606

192.168.40.78:7707

192.168.40.78:8808

Mutex

2MadfT525Jmp

Attributes

delay
3
install
true
install_file
epicgames.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

resource	yara_rule
behavioral1/files/0x0004000000004ed7-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2796	epicgames.exe

Loads dropped DLL 1 IoCs

pid	Process
2840	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	epicgames.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2648	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
2180	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2024	AsyncClient.exe
2024	AsyncClient.exe
2024	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2024	AsyncClient.exe
Token: SeDebugPrivilege	2796	epicgames.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2024 wrote to memory of 1704	2024	AsyncClient.exe	31
PID 2024 wrote to memory of 1704	2024	AsyncClient.exe	31
PID 2024 wrote to memory of 1704	2024	AsyncClient.exe	31
PID 2024 wrote to memory of 1704	2024	AsyncClient.exe	31
PID 2024 wrote to memory of 2840	2024	AsyncClient.exe	33
PID 2024 wrote to memory of 2840	2024	AsyncClient.exe	33
PID 2024 wrote to memory of 2840	2024	AsyncClient.exe	33
PID 2024 wrote to memory of 2840	2024	AsyncClient.exe	33
PID 2840 wrote to memory of 2648	2840	cmd.exe	36
PID 2840 wrote to memory of 2648	2840	cmd.exe	36
PID 2840 wrote to memory of 2648	2840	cmd.exe	36
PID 2840 wrote to memory of 2648	2840	cmd.exe	36
PID 1704 wrote to memory of 2180	1704	cmd.exe	35
PID 1704 wrote to memory of 2180	1704	cmd.exe	35
PID 1704 wrote to memory of 2180	1704	cmd.exe	35
PID 1704 wrote to memory of 2180	1704	cmd.exe	35
PID 2840 wrote to memory of 2796	2840	cmd.exe	37
PID 2840 wrote to memory of 2796	2840	cmd.exe	37
PID 2840 wrote to memory of 2796	2840	cmd.exe	37
PID 2840 wrote to memory of 2796	2840	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:2024
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "epicgames" /tr '"C:\Users\Admin\AppData\Roaming\epicgames.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1704
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "epicgames" /tr '"C:\Users\Admin\AppData\Roaming\epicgames.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2180
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpEBE5.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2840
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2648
- - C:\Users\Admin\AppData\Roaming\epicgames.exe
    "C:\Users\Admin\AppData\Roaming\epicgames.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2796

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\tmpEBE5.tmp.bat

Filesize
153B

MD5
ee12bf0cfe09cfaa619b0ab0900b2784

SHA1
1fb7b8a824627a8cc0dec1df71df7203b4332d01

SHA256
63d07b3eba7364187b3cdee175c4fa6e00697475bf1514bb806d67afc7748d8d

SHA512
6cc867c29b1a4a7f46d6d866e2322e5b065fecf19db87a11ef66585de650abc944c7bae3c18d0a3c84754d2d2ce46c45d9d009de92936afdbfc85923d032b623

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

Filesize
72KB

MD5
4e6add4d01c71b6da1b1ef92ece5e4d9

SHA1
119c4d128e6a0bc216d724de3cae474b236be3a9

SHA256
f383a6ec81b2cc2c6f76d35d63c6d63e927e52d4b35e7fe4e1974eda71fe3331

SHA512
002e6b5665cd901eeb4ad21271dc59ba2b028ef234d41c4f391a08f3c7d7da58f1ce4645c78b7d015ed9c967a0fb0fab6489df8d12f6edeedcb991d97724238d

Download Submit
memory/2024-0-0x000000007429E000-0x000000007429F000-memory.dmp

Filesize
4KB

Download
memory/2024-1-0x0000000001040000-0x0000000001058000-memory.dmp

Filesize
96KB

Download
memory/2024-2-0x0000000074290000-0x000000007497E000-memory.dmp

Filesize
6.9MB

Download
memory/2024-12-0x0000000074290000-0x000000007497E000-memory.dmp

Filesize
6.9MB

Download
memory/2796-16-0x0000000000C80000-0x0000000000C98000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads