asyncrat | 513105f291a41960b5e08f5e94dee377eae8f6b483e012cc835869b639e1fc5b

General

Target

AsyncClient.exe
Size

47KB
MD5

990d7fc3e6573a3622f530c3975a0d59
SHA1

eb90ae84dd1416b431a352ce70c3146c7c7a311a
SHA256

513105f291a41960b5e08f5e94dee377eae8f6b483e012cc835869b639e1fc5b
SHA512

e92b36f8ea66ac7bcf07e7d45b0288f160513ddc40a0e414167748276cfcdee92b0eef0be1c580b4bde7a6c7e7547d93ba525d77e9b620698f033c8b8e695e49
SSDEEP

768:cu4X9TskvpDWUPlNxmo2qbx4IV1Xz5PI6smtd0bngny0ZUVYhyDnRPJRcfBDZEx:cu4X9Tswb2+NK6smt6bngyiUqkpJ6dEx

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

192.168.100.96:6606

192.168.100.96:7707

192.168.100.96:8808

Mutex

EwG9PLMu7fcT

Attributes

delay
3
install
true
install_file
Debugger.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/0x001c00000002aa59-12.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2908	Debugger.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Debugger.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2448	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
3724	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe
4304	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4304	AsyncClient.exe
Token: SeDebugPrivilege	2908	Debugger.exe
Token: SeDebugPrivilege	2908	Debugger.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4304 wrote to memory of 4672	4304	AsyncClient.exe	78
PID 4304 wrote to memory of 4672	4304	AsyncClient.exe	78
PID 4304 wrote to memory of 4672	4304	AsyncClient.exe	78
PID 4304 wrote to memory of 3584	4304	AsyncClient.exe	80
PID 4304 wrote to memory of 3584	4304	AsyncClient.exe	80
PID 4304 wrote to memory of 3584	4304	AsyncClient.exe	80
PID 3584 wrote to memory of 2448	3584	cmd.exe	82
PID 3584 wrote to memory of 2448	3584	cmd.exe	82
PID 3584 wrote to memory of 2448	3584	cmd.exe	82
PID 4672 wrote to memory of 3724	4672	cmd.exe	83
PID 4672 wrote to memory of 3724	4672	cmd.exe	83
PID 4672 wrote to memory of 3724	4672	cmd.exe	83
PID 3584 wrote to memory of 2908	3584	cmd.exe	84
PID 3584 wrote to memory of 2908	3584	cmd.exe	84
PID 3584 wrote to memory of 2908	3584	cmd.exe	84

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:4304
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Debugger" /tr '"C:\Users\Admin\AppData\Roaming\Debugger.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4672
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Debugger" /tr '"C:\Users\Admin\AppData\Roaming\Debugger.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3724
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAC7C.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3584
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2448
- - C:\Users\Admin\AppData\Roaming\Debugger.exe
    "C:\Users\Admin\AppData\Roaming\Debugger.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2908

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\tmpAC7C.tmp.bat

Filesize
152B

MD5
c9448a74b1053e43c1fea2f768780247

SHA1
f28fac270f05291262bde36669d66080e44880e5

SHA256
7f1e351ad52f78846b835ec96fb32ea0b46d8c7c0f6b8069caae0de01a1cc6b4

SHA512
7033f061a59aa1e3100088d1295c1d65c2c28ec6b2320010e2db4b16f8d11d23707c35dd941efef67d8a6271a9466f11b1bc360859bcb48521d5c6f89e3eefe5

Download Submit
C:\Users\Admin\AppData\Roaming\Debugger.exe

Filesize
47KB

MD5
990d7fc3e6573a3622f530c3975a0d59

SHA1
eb90ae84dd1416b431a352ce70c3146c7c7a311a

SHA256
513105f291a41960b5e08f5e94dee377eae8f6b483e012cc835869b639e1fc5b

SHA512
e92b36f8ea66ac7bcf07e7d45b0288f160513ddc40a0e414167748276cfcdee92b0eef0be1c580b4bde7a6c7e7547d93ba525d77e9b620698f033c8b8e695e49

Download Submit
memory/2908-14-0x00000000751B0000-0x0000000075961000-memory.dmp

Filesize
7.7MB

Download
memory/2908-15-0x00000000751B0000-0x0000000075961000-memory.dmp

Filesize
7.7MB

Download
memory/4304-0-0x000000007522E000-0x000000007522F000-memory.dmp

Filesize
4KB

Download
memory/4304-1-0x0000000000500000-0x0000000000512000-memory.dmp

Filesize
72KB

Download
memory/4304-2-0x0000000075220000-0x00000000759D1000-memory.dmp

Filesize
7.7MB

Download
memory/4304-3-0x0000000004FC0000-0x0000000005026000-memory.dmp

Filesize
408KB

Download
memory/4304-4-0x0000000005410000-0x00000000054AC000-memory.dmp

Filesize
624KB

Download
memory/4304-9-0x0000000075220000-0x00000000759D1000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads