asyncrat | 2039dfbccacc781852e958fd710d12dbd26586c379e97b192c82b0343ee25ae0

General

Target

RuntimeBroker.exe
Size

48KB
MD5

f48dad5d1f222ffbad834e1735942077
SHA1

450940def40ae8cf9b48e7fed829f43802f9a984
SHA256

2039dfbccacc781852e958fd710d12dbd26586c379e97b192c82b0343ee25ae0
SHA512

a8bd8fd998c71cd5291243808f2bafe2fbf65f4d62646fbdf775f66b650f628e8f675fb6b5a7ea2b287efcc457a90e8c1403717e9f5b30bce9136bf78b83e06d
SSDEEP

768:Ru+01TQQEX1WUVt1Pmo2qjRx7u4vfW+0yD0b6nIkrTN4+djyP6a8T317oSkcDZ22:Ru+01TQfb2kv++0db6nXa8ySaYBbd2P+

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

impact-leeds.gl.at.ply.gg:44574

Mutex

rSqd9NDbOdBy

Attributes

delay
3
install
true
install_file
RuntimeBroker.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/0x0032000000023b5b-10.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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	RuntimeBroker.exe

Executes dropped EXE 1 IoCs

pid	Process
4076	RuntimeBroker.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
5004	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
3584	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe
2032	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2032	RuntimeBroker.exe
Token: SeDebugPrivilege	4076	RuntimeBroker.exe
Token: SeDebugPrivilege	4076	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2032 wrote to memory of 4036	2032	RuntimeBroker.exe	86
PID 2032 wrote to memory of 4036	2032	RuntimeBroker.exe	86
PID 2032 wrote to memory of 4036	2032	RuntimeBroker.exe	86
PID 2032 wrote to memory of 2284	2032	RuntimeBroker.exe	88
PID 2032 wrote to memory of 2284	2032	RuntimeBroker.exe	88
PID 2032 wrote to memory of 2284	2032	RuntimeBroker.exe	88
PID 4036 wrote to memory of 3584	4036	cmd.exe	90
PID 4036 wrote to memory of 3584	4036	cmd.exe	90
PID 4036 wrote to memory of 3584	4036	cmd.exe	90
PID 2284 wrote to memory of 5004	2284	cmd.exe	91
PID 2284 wrote to memory of 5004	2284	cmd.exe	91
PID 2284 wrote to memory of 5004	2284	cmd.exe	91
PID 2284 wrote to memory of 4076	2284	cmd.exe	92
PID 2284 wrote to memory of 4076	2284	cmd.exe	92
PID 2284 wrote to memory of 4076	2284	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2032
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4036
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3584
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7D1F.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2284
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5004
- - C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
    "C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4076

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\RuntimeBroker.exe.log

Filesize
614B

MD5
54920f388010333559bdff225040761d

SHA1
040972bf1fc83014f10c45832322c094f883ce30

SHA256
9ed5449a36700939987209c7a2974b9cc669b8b22c7c4e7936f35dda0a4dc359

SHA512
e17aa5d1328b3bfd3754d15b3c2eded98653d90c7b326f941522e0b3bd6f557880246a6bc69047facb42eb97d2e0ed6c46148dfe95a98669fc4e1d07c21a285c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp7D1F.tmp.bat

Filesize
157B

MD5
1fabfab9792e85f1e566e7e9f5e5ca01

SHA1
0a95fb84f5c096a005b8909ce99749314b39a090

SHA256
e3a49f466f101737fe1d66c55e2f05e9b34c52c3c4ed1b3616ac1aa1a2621bc3

SHA512
f61775188ddeacc26f079b524fc3759f6794a2a15fbc5a6eb9d8514d5c382ebf04864e4f0429500a81864098eb25fec1f819d62ed55f4d47e635ee7ea5aeb038

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

Filesize
48KB

MD5
f48dad5d1f222ffbad834e1735942077

SHA1
450940def40ae8cf9b48e7fed829f43802f9a984

SHA256
2039dfbccacc781852e958fd710d12dbd26586c379e97b192c82b0343ee25ae0

SHA512
a8bd8fd998c71cd5291243808f2bafe2fbf65f4d62646fbdf775f66b650f628e8f675fb6b5a7ea2b287efcc457a90e8c1403717e9f5b30bce9136bf78b83e06d

Download Submit
memory/2032-0-0x000000007498E000-0x000000007498F000-memory.dmp

Filesize
4KB

Download
memory/2032-1-0x0000000000410000-0x0000000000422000-memory.dmp

Filesize
72KB

Download
memory/2032-2-0x00000000052D0000-0x0000000005336000-memory.dmp

Filesize
408KB

Download
memory/2032-3-0x00000000059A0000-0x0000000005A3C000-memory.dmp

Filesize
624KB

Download
memory/4076-13-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/4076-14-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads