asyncrat | 95fc0ee2c4b9f1bda8b21a51541d16d27bdc27357cbffb7e13023213f15773c9

General

Target
AsyncClient.exe
Size 82KB
Sample261023-bcajhavzhy
SHA256 95fc0ee2c4b9f1bda8b21a51541d16d27bdc27357cbffb7e13023213f15773c9
MD5 f8ef32dbfdb1add37c1249ef12c376a4
SHA1 441ee519c8de4718a07b5a9bbc92f495df3f1c1d
SHA512 66967f8149c14fe72a483c78b1e4e414131abe15eb87cdf6aeea5c7b14f2fb50bce7e03e7565e8783253bae328d5e8779881ee2fedd56ed99287681d11235be3
SSDEEP 1536:Guuc1TFcJ2FKTkDy3bCXSn3rm9dF3wDu3Y6Uk9jg+rr6GbOsKpeQiQKWyJ:GuuoTFcJ2FskDy3bCJ9wDud7r6GiX8Qc
TLSH
T121838D007FD8865AF67ECB34A8E252464779BD572806D18D0EC479EB4B33BC19A025FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

Hoiquantv5.online:6606
Hoiquantv5.online:7707
Hoiquantv5.online:8808
Hoiquantv5.online:443
Hoiquantv5.online:80

Mutex

UlDVfT2peqY8

Attributes

delay
3
install
true
install_file
Hoiquantv5.online.exe
install_folder
%AppData%

aes.plain

Signatures

Family: 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/0x000300000001e6f5-8.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-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 2 IoCs

pid	Process
1728	Hoiquantv5.online.exe
4632	Hoiquantv5.online.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5052	cmd.exe
4484	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	Hoiquantv5.online.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	Hoiquantv5.online.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Hoiquantv5.online.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Hoiquantv5.online.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

defense_evasion

pid	Process
4908	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
1608	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe
1500	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1500	AsyncClient.exe
Token: SeDebugPrivilege	1728	Hoiquantv5.online.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1500 wrote to memory of 5052	1500	AsyncClient.exe	90
PID 1500 wrote to memory of 4484	1500	AsyncClient.exe	92
PID 4484 wrote to memory of 4908	4484	cmd.exe	94
PID 5052 wrote to memory of 1608	5052	cmd.exe	95
PID 4484 wrote to memory of 4632	4484	cmd.exe	98

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:1500
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Hoiquantv5.online" /tr '"C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5052
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Hoiquantv5.online" /tr '"C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1608
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAEC9.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4484
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4908
- - C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe
    "C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4632

C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe
"C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1728

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmpAEC9.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpAEC9.tmp.bat
Size 161B
SHA256 66f80992266fe096d4d76140030f66f1546716a1db4497b04f1fed2cd529f39c
MD5 fb50b147e8a7ad7403f027f9e36b79ec
SHA1 ea14fe47a1d2fd9fce038e6018c2f2afcf159468
SHA512 988776638238b65f67ee5892f7ae798b807c994032d812eb75e4bbb0cd0ec90d58f9c2a544d22d377d6abb0830992eec0c356d974ac1d375ebf2c58d496cdb78
TLSH
T173C08C5251CAAA0E7809545302FAD98E92B7681A3E80BF20C348400BA6804AEF4D9382
MD5 SHA1 SHA512 TLSH

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Hoiquantv5.online.exe

Path C:\Users\Admin\AppData\Roaming\Hoiquantv5.online.exe
Size 82KB
SHA256 95fc0ee2c4b9f1bda8b21a51541d16d27bdc27357cbffb7e13023213f15773c9
MD5 f8ef32dbfdb1add37c1249ef12c376a4
SHA1 441ee519c8de4718a07b5a9bbc92f495df3f1c1d
SHA512 66967f8149c14fe72a483c78b1e4e414131abe15eb87cdf6aeea5c7b14f2fb50bce7e03e7565e8783253bae328d5e8779881ee2fedd56ed99287681d11235be3
SSDEEP 1536:Guuc1TFcJ2FKTkDy3bCXSn3rm9dF3wDu3Y6Uk9jg+rr6GbOsKpeQiQKWyJ:GuuoTFcJ2FskDy3bCJ9wDud7r6GiX8Qc
TLSH
T121838D007FD8865AF67ECB34A8E252464779BD572806D18D0EC479EB4B33BC19A025FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1500-0-0x0000000000F50000-0x0000000000F6A000-memory.dmp

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memory/1500-1-0x0000000005940000-0x0000000005950000-memory.dmp

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memory/1500-2-0x00000000059F0000-0x0000000005A8C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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