asyncrat | 49ed02a2f8ace5109a2f4338337adcf13b5ede8cf604e8503b6104b1b15abac8

General

Target

AsyncClient.exe
Size

47KB
MD5

2fdc954cd7e67e334bfe190bbb64d0ba
SHA1

315f1f6606857285750f5017f5dc8bb18cb9ce64
SHA256

49ed02a2f8ace5109a2f4338337adcf13b5ede8cf604e8503b6104b1b15abac8
SHA512

74dbdfec21a062afbed84ecdfeb1a8f4ce7263fa8dcf19cfad69eaa3614d25756d3c99ab1d2470ea0f8c13bb04c5519a4738f0fd021a5d3ab63d1ec72f10405f
SSDEEP

768:Auk0VT3ongoWU2Gjimo2qr574wBW1APIz9G464EP0bSVKbAg+oa1BmM7ikjMbvvO:Auk0VT3Q+2GDBW1l5G4647bShb1BekAC

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:7707

127.0.0.1:8808

Mutex

fXvhcv23OBXx

Attributes

delay
3
install
true
install_file
hey.exe
install_folder
%AppData%

aes.plain

Signatures

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/0x001100000002332d-11.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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
4912	hey.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	hey.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
3480	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
840	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe
3916	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3916	AsyncClient.exe
Token: SeDebugPrivilege	4912	hey.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3916 wrote to memory of 1464	3916	AsyncClient.exe	93
PID 3916 wrote to memory of 1464	3916	AsyncClient.exe	93
PID 3916 wrote to memory of 1464	3916	AsyncClient.exe	93
PID 3916 wrote to memory of 4800	3916	AsyncClient.exe	95
PID 3916 wrote to memory of 4800	3916	AsyncClient.exe	95
PID 3916 wrote to memory of 4800	3916	AsyncClient.exe	95
PID 4800 wrote to memory of 3480	4800	cmd.exe	98
PID 4800 wrote to memory of 3480	4800	cmd.exe	98
PID 4800 wrote to memory of 3480	4800	cmd.exe	98
PID 1464 wrote to memory of 840	1464	cmd.exe	97
PID 1464 wrote to memory of 840	1464	cmd.exe	97
PID 1464 wrote to memory of 840	1464	cmd.exe	97
PID 4800 wrote to memory of 4912	4800	cmd.exe	100
PID 4800 wrote to memory of 4912	4800	cmd.exe	100
PID 4800 wrote to memory of 4912	4800	cmd.exe	100

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:3916
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1464
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:840
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8C32.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4800
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3480
- - C:\Users\Admin\AppData\Roaming\hey.exe
    "C:\Users\Admin\AppData\Roaming\hey.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4912

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\tmp8C32.tmp.bat

Filesize
147B

MD5
952af159d56e553e7594f455fa175040

SHA1
96e508ecbbfedc77d876be769c05a0f1826ca761

SHA256
1493b030611c5d0b0b30bd72b17cc9b2ac80d305f30b8edbd18607b05245f680

SHA512
0fae2a3839dd8021f62a7d9f538a8c9aa6ff15562a0c368c22d337c387bfdfbd422b3bb18b2cd6448424d654559bfd38fadd4c9b04ea8f716faeb993f632257e

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

Filesize
47KB

MD5
2fdc954cd7e67e334bfe190bbb64d0ba

SHA1
315f1f6606857285750f5017f5dc8bb18cb9ce64

SHA256
49ed02a2f8ace5109a2f4338337adcf13b5ede8cf604e8503b6104b1b15abac8

SHA512
74dbdfec21a062afbed84ecdfeb1a8f4ce7263fa8dcf19cfad69eaa3614d25756d3c99ab1d2470ea0f8c13bb04c5519a4738f0fd021a5d3ab63d1ec72f10405f

Download Submit
memory/3916-0-0x000000007504E000-0x000000007504F000-memory.dmp

Filesize
4KB

Download
memory/3916-1-0x0000000000370000-0x0000000000382000-memory.dmp

Filesize
72KB

Download
memory/3916-2-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-3-0x0000000004BF0000-0x0000000004C8C000-memory.dmp

Filesize
624KB

Download
memory/3916-8-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4912-13-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4912-14-0x0000000075040000-0x00000000757F0000-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