asyncrat | 93fff1de1a8e1d6adc48423aa83dd7b7ade28afa1165ee52a9a265d963bdca33

General

Target

AsyncClient2.exe
Size

47KB
MD5

a9ae63224c966474187616630f021223
SHA1

bdc84d7b53a5efa08370018612015fe3acf5b623
SHA256

93fff1de1a8e1d6adc48423aa83dd7b7ade28afa1165ee52a9a265d963bdca33
SHA512

5c1afb9cf12190d28a6f764002441b060e30bd2dd12451d2c8023b9c2e78d908ed1116d5a69aa40ea12d0c5b6a40806610947c548081ec58bce24d1366b48564
SSDEEP

768:QuyxNTAoZjRWUJd9bmo2qLZk3+Zn0BB4PIXLB8H6n0bvEOuSsP7rnmVj6ewb7BDM:QuyxNTAGL2ns0BB9XLBq60bvEAs/n6jR

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

tagol51982-62186.portmap.host:62186

Mutex

auh8YpVUAiXR

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/0x000600000001e435-12.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-1-5-21-1874072718-2205492803-118941907-1000\Control Panel\International\Geo\Nation	AsyncClient2.exe

Executes dropped EXE 1 IoCs

pid	Process
4120	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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient2.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
960	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
2040	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe
2808	AsyncClient2.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2808	AsyncClient2.exe
Token: SeDebugPrivilege	4120	svchost.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2808 wrote to memory of 2788	2808	AsyncClient2.exe	93
PID 2808 wrote to memory of 2788	2808	AsyncClient2.exe	93
PID 2808 wrote to memory of 2788	2808	AsyncClient2.exe	93
PID 2808 wrote to memory of 4444	2808	AsyncClient2.exe	95
PID 2808 wrote to memory of 4444	2808	AsyncClient2.exe	95
PID 2808 wrote to memory of 4444	2808	AsyncClient2.exe	95
PID 4444 wrote to memory of 960	4444	cmd.exe	97
PID 4444 wrote to memory of 960	4444	cmd.exe	97
PID 4444 wrote to memory of 960	4444	cmd.exe	97
PID 2788 wrote to memory of 2040	2788	cmd.exe	98
PID 2788 wrote to memory of 2040	2788	cmd.exe	98
PID 2788 wrote to memory of 2040	2788	cmd.exe	98
PID 4444 wrote to memory of 4120	4444	cmd.exe	100
PID 4444 wrote to memory of 4120	4444	cmd.exe	100
PID 4444 wrote to memory of 4120	4444	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\AsyncClient2.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient2.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2808
- 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:2788
- - 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:2040
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9C01.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4444
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:960
- - 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:4120

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\tmp9C01.tmp.bat

Filesize
151B

MD5
9b004f7caa322df216adfd9d1a69d4c3

SHA1
58adab7baeef9e3ecc17848b2b431d1fc8911942

SHA256
3db3788025fa5a4fc30c493d71e5b7248e9c2408117a32925a1d6dc22df22a41

SHA512
341b03928840c783d0c3a0e76fc623542e55fad833aba464623de2719bc31b161cd4b2617adb32d805046286d996c1d4100b694effb49c7c388085d1a37a06e5

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

Filesize
47KB

MD5
a9ae63224c966474187616630f021223

SHA1
bdc84d7b53a5efa08370018612015fe3acf5b623

SHA256
93fff1de1a8e1d6adc48423aa83dd7b7ade28afa1165ee52a9a265d963bdca33

SHA512
5c1afb9cf12190d28a6f764002441b060e30bd2dd12451d2c8023b9c2e78d908ed1116d5a69aa40ea12d0c5b6a40806610947c548081ec58bce24d1366b48564

Download Submit
memory/2808-0-0x000000007464E000-0x000000007464F000-memory.dmp

Filesize
4KB

Download
memory/2808-1-0x0000000000560000-0x0000000000572000-memory.dmp

Filesize
72KB

Download
memory/2808-2-0x0000000074640000-0x0000000074DF0000-memory.dmp

Filesize
7.7MB

Download
memory/2808-3-0x0000000004F30000-0x0000000004F96000-memory.dmp

Filesize
408KB

Download
memory/2808-4-0x0000000005400000-0x000000000549C000-memory.dmp

Filesize
624KB

Download
memory/2808-9-0x0000000074640000-0x0000000074DF0000-memory.dmp

Filesize
7.7MB

Download
memory/4120-14-0x00000000745B0000-0x0000000074D60000-memory.dmp

Filesize
7.7MB

Download
memory/4120-15-0x00000000745B0000-0x0000000074D60000-memory.dmp

Filesize
7.7MB

Download
memory/4120-18-0x00000000061B0000-0x0000000006754000-memory.dmp

Filesize
5.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads