asyncrat | e438bbb7f03603305d8892121fc56e9d0327ca8ff34d56228cbfa198a438ede0

General

Target

AsyncClient.exe
Size

45KB
MD5

69030c7c0d7ed75f53081749da1e1c22
SHA1

98623da151fdbe7f45ad806b0c002878b8a0b7ce
SHA256

e438bbb7f03603305d8892121fc56e9d0327ca8ff34d56228cbfa198a438ede0
SHA512

09e25d55f725f06af3c450ef04b8c89051655df422ab7db0dfa6b864575bf97b0c1f396b4cd3c619cf109e7e1451a9cbda1c84abbec31cbee080f60e9969bd02
SSDEEP

768:luI1tT/w70kWUquzumo2qzEKjPGaG6PIyzjbFgX3ixDqokxD/eBDZWx:luI1tT/kW2tKTkDy3bCXSEodWx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

83.99.11.13:6606

83.99.11.13:7707

83.99.11.13:8808

Mutex

HTKBgEz9kLr9

Attributes

delay
3
install
true
install_file
virus.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/0x000200000001e762-11.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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
3768	virus.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	virus.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1228	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
1884	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe
3928	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3928	AsyncClient.exe
Token: SeDebugPrivilege	3768	virus.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3928 wrote to memory of 3300	3928	AsyncClient.exe	85
PID 3928 wrote to memory of 3300	3928	AsyncClient.exe	85
PID 3928 wrote to memory of 3300	3928	AsyncClient.exe	85
PID 3928 wrote to memory of 1588	3928	AsyncClient.exe	87
PID 3928 wrote to memory of 1588	3928	AsyncClient.exe	87
PID 3928 wrote to memory of 1588	3928	AsyncClient.exe	87
PID 1588 wrote to memory of 1228	1588	cmd.exe	89
PID 1588 wrote to memory of 1228	1588	cmd.exe	89
PID 1588 wrote to memory of 1228	1588	cmd.exe	89
PID 3300 wrote to memory of 1884	3300	cmd.exe	90
PID 3300 wrote to memory of 1884	3300	cmd.exe	90
PID 3300 wrote to memory of 1884	3300	cmd.exe	90
PID 1588 wrote to memory of 3768	1588	cmd.exe	98
PID 1588 wrote to memory of 3768	1588	cmd.exe	98
PID 1588 wrote to memory of 3768	1588	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:3928
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3300
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1884
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9B65.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1588
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1228
- - C:\Users\Admin\AppData\Roaming\virus.exe
    "C:\Users\Admin\AppData\Roaming\virus.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3768

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\tmp9B65.tmp.bat

Filesize
149B

MD5
a6a56aa5c39837c497a76620f4032c00

SHA1
05cdc27487c83b39efdcde180738132a546c2e54

SHA256
793eae5a8d451d41648ddbe7e74e9f7efd224bae65194b333f039fa40ec2a7b4

SHA512
138eddb1bd0edbbdc62352fec8f5ff9968cb48552d62e34be7fbf8f507f7f8c98817ca11347d043e809f6b85ccb703a50ea50b95202be415d174079503dca01d

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

Filesize
45KB

MD5
69030c7c0d7ed75f53081749da1e1c22

SHA1
98623da151fdbe7f45ad806b0c002878b8a0b7ce

SHA256
e438bbb7f03603305d8892121fc56e9d0327ca8ff34d56228cbfa198a438ede0

SHA512
09e25d55f725f06af3c450ef04b8c89051655df422ab7db0dfa6b864575bf97b0c1f396b4cd3c619cf109e7e1451a9cbda1c84abbec31cbee080f60e9969bd02

Download Submit
memory/3768-13-0x0000000075020000-0x00000000757D0000-memory.dmp

Filesize
7.7MB

Download
memory/3768-14-0x0000000075020000-0x00000000757D0000-memory.dmp

Filesize
7.7MB

Download
memory/3928-0-0x00000000750CE000-0x00000000750CF000-memory.dmp

Filesize
4KB

Download
memory/3928-1-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3928-2-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/3928-3-0x0000000004E40000-0x0000000004EDC000-memory.dmp

Filesize
624KB

Download
memory/3928-9-0x00000000750C0000-0x0000000075870000-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