asyncrat | 9c634eadf89f71c1e08935c48e9f4ee7bf8f1451814d6b5eb96d2afc68e62dc0

General

Target

AsyncClient.exe
Size

47KB
MD5

dee1187bd04663123bee93ef3c121f97
SHA1

a1ebad9c7974ba236cd1869f798ff045b23d680d
SHA256

9c634eadf89f71c1e08935c48e9f4ee7bf8f1451814d6b5eb96d2afc68e62dc0
SHA512

c7ef58181ebdacedb79074557b2b7a4d02d58434998d23ada6a0412413500d9195d2e01103879368b79bdda6b41da09707886504c52bee6ff56226295b8db5ef
SSDEEP

768:5uyqFTMIGZ8btAWUu7y6mo2q8e75gbvb3vPIvPB+7Rvb0be22lrWmi01eWru6j1t:5uyqFTMtkf2KSvb3ovPAFvwbe22ZFiy/

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

192.168.0.14:6606

192.168.0.14:7707

192.168.0.14:8808

Mutex

fS9gexl8XlMZ

Attributes

delay
3
install
true
install_file
control.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/0x000200000001e747-12.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1412	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
3784	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe
4912	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4912	AsyncClient.exe
Token: SeDebugPrivilege	404	control.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4912 wrote to memory of 4748	4912	AsyncClient.exe	86
PID 4912 wrote to memory of 4748	4912	AsyncClient.exe	86
PID 4912 wrote to memory of 4748	4912	AsyncClient.exe	86
PID 4912 wrote to memory of 1952	4912	AsyncClient.exe	88
PID 4912 wrote to memory of 1952	4912	AsyncClient.exe	88
PID 4912 wrote to memory of 1952	4912	AsyncClient.exe	88
PID 1952 wrote to memory of 1412	1952	cmd.exe	90
PID 1952 wrote to memory of 1412	1952	cmd.exe	90
PID 1952 wrote to memory of 1412	1952	cmd.exe	90
PID 4748 wrote to memory of 3784	4748	cmd.exe	91
PID 4748 wrote to memory of 3784	4748	cmd.exe	91
PID 4748 wrote to memory of 3784	4748	cmd.exe	91
PID 1952 wrote to memory of 404	1952	cmd.exe	93
PID 1952 wrote to memory of 404	1952	cmd.exe	93
PID 1952 wrote to memory of 404	1952	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4912
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "control" /tr '"C:\Users\Admin\AppData\Roaming\control.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4748
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "control" /tr '"C:\Users\Admin\AppData\Roaming\control.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3784
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9172.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1952
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1412
- - C:\Users\Admin\AppData\Roaming\control.exe
    "C:\Users\Admin\AppData\Roaming\control.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:404

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

Query Registry

1

T1012

System Information Discovery

2

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\tmp9172.tmp.bat

Filesize
151B

MD5
97d8a37e62c4bbacc953e8f9e2e02fb8

SHA1
eff26769787b28360d534b9b4fe2952f1417d021

SHA256
1fc864ebca9deb8c5c156cc4ce02fcd00c2bbfc239304281b066a05a8a3997cb

SHA512
ff456bd5d7db97fbd867f9b732dd1e8019f5766316a4ac5de15933b6cd7feaad44a85bac7411a1fe03b4ef6c7cf5690f90f3c48d96eb8d36079dd4fb19510277

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

Filesize
47KB

MD5
dee1187bd04663123bee93ef3c121f97

SHA1
a1ebad9c7974ba236cd1869f798ff045b23d680d

SHA256
9c634eadf89f71c1e08935c48e9f4ee7bf8f1451814d6b5eb96d2afc68e62dc0

SHA512
c7ef58181ebdacedb79074557b2b7a4d02d58434998d23ada6a0412413500d9195d2e01103879368b79bdda6b41da09707886504c52bee6ff56226295b8db5ef

Download Submit
memory/404-14-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/404-15-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4912-0-0x00000000750EE000-0x00000000750EF000-memory.dmp

Filesize
4KB

Download
memory/4912-1-0x0000000000A90000-0x0000000000AA2000-memory.dmp

Filesize
72KB

Download
memory/4912-2-0x00000000750E0000-0x0000000075890000-memory.dmp

Filesize
7.7MB

Download
memory/4912-3-0x0000000005360000-0x00000000053C6000-memory.dmp

Filesize
408KB

Download
memory/4912-4-0x0000000005780000-0x000000000581C000-memory.dmp

Filesize
624KB

Download
memory/4912-10-0x00000000750E0000-0x0000000075890000-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