asyncrat | b6c58155365a5e35952e46611fd7b43e36e256903bff2030bc07a3c6841b836f

General

Target

AsyncClient.exe
Size

45KB
MD5

7ace559d317742937e8254dc6da92a7e
SHA1

e4986e5b11b96bedc62af5cfb3b48bed58d8d1c9
SHA256

b6c58155365a5e35952e46611fd7b43e36e256903bff2030bc07a3c6841b836f
SHA512

2c50337078075dc6bfd8b02d77d4de8e5b9ad5b01deed1a3b4f3eb0b2d21efce2736e74d5cf94fdf937bcc2a51c2ecf98022049c706350feacb079c4b968d5d3
SSDEEP

768:hukaVT3ongoWU2zjimo2qrrKjGKG6PIyzjbFgX3ij8z+vfYO4qHBDZMhd:hukaVT3QR2mKYDy3bCXSjlfYQdMd

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

96.248.52.125:8031

Mutex

adobe_6SI8OkPnk

Attributes

delay
3
install
true
install_file
update.exe
install_folder
%Temp%

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/0x000b00000001225c-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2856	update.exe

Loads dropped DLL 1 IoCs

pid	Process
2872	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	update.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2776	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
2804	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1852	AsyncClient.exe
1852	AsyncClient.exe
1852	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1852	AsyncClient.exe
Token: SeDebugPrivilege	2856	update.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1852 wrote to memory of 2028	1852	AsyncClient.exe	30
PID 1852 wrote to memory of 2028	1852	AsyncClient.exe	30
PID 1852 wrote to memory of 2028	1852	AsyncClient.exe	30
PID 1852 wrote to memory of 2028	1852	AsyncClient.exe	30
PID 1852 wrote to memory of 2872	1852	AsyncClient.exe	32
PID 1852 wrote to memory of 2872	1852	AsyncClient.exe	32
PID 1852 wrote to memory of 2872	1852	AsyncClient.exe	32
PID 1852 wrote to memory of 2872	1852	AsyncClient.exe	32
PID 2028 wrote to memory of 2804	2028	cmd.exe	34
PID 2028 wrote to memory of 2804	2028	cmd.exe	34
PID 2028 wrote to memory of 2804	2028	cmd.exe	34
PID 2028 wrote to memory of 2804	2028	cmd.exe	34
PID 2872 wrote to memory of 2776	2872	cmd.exe	35
PID 2872 wrote to memory of 2776	2872	cmd.exe	35
PID 2872 wrote to memory of 2776	2872	cmd.exe	35
PID 2872 wrote to memory of 2776	2872	cmd.exe	35
PID 2872 wrote to memory of 2856	2872	cmd.exe	36
PID 2872 wrote to memory of 2856	2872	cmd.exe	36
PID 2872 wrote to memory of 2856	2872	cmd.exe	36
PID 2872 wrote to memory of 2856	2872	cmd.exe	36
PID 2872 wrote to memory of 2856	2872	cmd.exe	36
PID 2872 wrote to memory of 2856	2872	cmd.exe	36
PID 2872 wrote to memory of 2856	2872	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:1852
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Local\Temp\update.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2028
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Local\Temp\update.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2804
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp891D.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2776
- - C:\Users\Admin\AppData\Local\Temp\update.exe
    "C:\Users\Admin\AppData\Local\Temp\update.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2856

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\tmp891D.tmp.bat

Filesize
153B

MD5
e246e4c3337b8a2230e0e5e4f82339fb

SHA1
000b2c1e4cdca33888e16d24e81b3952b784bfe1

SHA256
d1d1088f943d8e0296f4cdfec4e82e99f4a46198cdd03a77b7214862c90f5384

SHA512
4ba1185d4428491f5fabb7925c6cae7eb5b48fb3a548a597a96ea41097cada0fc2489e34f056d62e4db9969b65577c50ac08d3b02a47e910635008dc593eb0c7

Download Submit
\Users\Admin\AppData\Local\Temp\update.exe

Filesize
45KB

MD5
7ace559d317742937e8254dc6da92a7e

SHA1
e4986e5b11b96bedc62af5cfb3b48bed58d8d1c9

SHA256
b6c58155365a5e35952e46611fd7b43e36e256903bff2030bc07a3c6841b836f

SHA512
2c50337078075dc6bfd8b02d77d4de8e5b9ad5b01deed1a3b4f3eb0b2d21efce2736e74d5cf94fdf937bcc2a51c2ecf98022049c706350feacb079c4b968d5d3

Download Submit
memory/1852-0-0x000000007449E000-0x000000007449F000-memory.dmp

Filesize
4KB

Download
memory/1852-1-0x00000000012D0000-0x00000000012E2000-memory.dmp

Filesize
72KB

Download
memory/1852-2-0x0000000074490000-0x0000000074B7E000-memory.dmp

Filesize
6.9MB

Download
memory/1852-11-0x0000000074490000-0x0000000074B7E000-memory.dmp

Filesize
6.9MB

Download
memory/2856-16-0x0000000000A40000-0x0000000000A52000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads