asyncrat | 58ef711fa31584a80ae7deb28920aacecd518d43d26b45a11b5d09797d04df5c

General

Target

AsyncClient.exe
Size

45KB
MD5

9d2593f72d9e9fb74f6e3ad33d43384d
SHA1

f249c1c871fcf3872458b3c59b3b71f27a55d8e3
SHA256

58ef711fa31584a80ae7deb28920aacecd518d43d26b45a11b5d09797d04df5c
SHA512

64ba71e5e6ea6bfee65683223e5c7f4741d1535eca67cd7265b4f82e5d7761626a7911ff446534f005d4e77c1063055807b7199685d9988bb57ccb41c8f82187
SSDEEP

768:DuwpFTAY3IQWUe9jqmo2qLoKjPGaG6PIyzjbFgX3i8+Nwd1pZKNoSD0FABDZni:DuwpFTA4/2xKTkDy3bCXS3KpENi4dni

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

197.48.124.155:5505

Mutex

yntVTgixvhf0

Attributes

delay
3
install
true
install_file
svchost.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
behavioral2/files/0x001b00000002ae9d-11.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
4136	svchost.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1184	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
3960	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe
3136	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3136	AsyncClient.exe
Token: SeDebugPrivilege	4136	svchost.exe
Token: SeDebugPrivilege	4136	svchost.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3136 wrote to memory of 3328	3136	AsyncClient.exe	78
PID 3136 wrote to memory of 3328	3136	AsyncClient.exe	78
PID 3136 wrote to memory of 3328	3136	AsyncClient.exe	78
PID 3136 wrote to memory of 3000	3136	AsyncClient.exe	80
PID 3136 wrote to memory of 3000	3136	AsyncClient.exe	80
PID 3136 wrote to memory of 3000	3136	AsyncClient.exe	80
PID 3328 wrote to memory of 3960	3328	cmd.exe	82
PID 3328 wrote to memory of 3960	3328	cmd.exe	82
PID 3328 wrote to memory of 3960	3328	cmd.exe	82
PID 3000 wrote to memory of 1184	3000	cmd.exe	83
PID 3000 wrote to memory of 1184	3000	cmd.exe	83
PID 3000 wrote to memory of 1184	3000	cmd.exe	83
PID 3000 wrote to memory of 4136	3000	cmd.exe	84
PID 3000 wrote to memory of 4136	3000	cmd.exe	84
PID 3000 wrote to memory of 4136	3000	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:3136
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3328
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3960
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp73C8.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3000
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1184
- - C:\Users\Admin\AppData\Roaming\svchost.exe
    "C:\Users\Admin\AppData\Roaming\svchost.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4136

Network

MITRE ATT&CK Enterprise v16

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\tmp73C8.tmp.bat

Filesize
151B

MD5
7a3469f0150ae0ff7d554899fef7c261

SHA1
5be8240acdfa3576852a2717ea8c35fedf0f358d

SHA256
3b9698be970f7614be3adaa56c10a8cce2e350e1e5e7b9b629f471d91050e8b9

SHA512
051a31ffe5e6f591d06ca178bcfb224115388fac96d54fb4a28f0989c160d37ffd370e236cb5b909c6130d93b66586e0f271d24d5567dab8816e89b827897022

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

Filesize
45KB

MD5
9d2593f72d9e9fb74f6e3ad33d43384d

SHA1
f249c1c871fcf3872458b3c59b3b71f27a55d8e3

SHA256
58ef711fa31584a80ae7deb28920aacecd518d43d26b45a11b5d09797d04df5c

SHA512
64ba71e5e6ea6bfee65683223e5c7f4741d1535eca67cd7265b4f82e5d7761626a7911ff446534f005d4e77c1063055807b7199685d9988bb57ccb41c8f82187

Download Submit
memory/3136-0-0x000000007471E000-0x000000007471F000-memory.dmp

Filesize
4KB

Download
memory/3136-1-0x0000000000B00000-0x0000000000B12000-memory.dmp

Filesize
72KB

Download
memory/3136-2-0x0000000074710000-0x0000000074EC1000-memory.dmp

Filesize
7.7MB

Download
memory/3136-3-0x0000000005580000-0x000000000561C000-memory.dmp

Filesize
624KB

Download
memory/3136-8-0x0000000074710000-0x0000000074EC1000-memory.dmp

Filesize
7.7MB

Download
memory/4136-13-0x0000000074710000-0x0000000074EC1000-memory.dmp

Filesize
7.7MB

Download
memory/4136-16-0x0000000006B40000-0x00000000070E6000-memory.dmp

Filesize
5.6MB

Download
memory/4136-17-0x0000000006290000-0x00000000062F6000-memory.dmp

Filesize
408KB

Download
memory/4136-18-0x0000000074710000-0x0000000074EC1000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads