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
behavioral1/files/0x001e00000002aa76-10.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1988	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	RuntimeBroker.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4180	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
3372	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe
4248	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4248	RuntimeBroker.exe
Token: SeDebugPrivilege	1988	RuntimeBroker.exe
Token: SeDebugPrivilege	1988	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 3964	4248	RuntimeBroker.exe	78
PID 4248 wrote to memory of 3964	4248	RuntimeBroker.exe	78
PID 4248 wrote to memory of 3964	4248	RuntimeBroker.exe	78
PID 4248 wrote to memory of 3540	4248	RuntimeBroker.exe	80
PID 4248 wrote to memory of 3540	4248	RuntimeBroker.exe	80
PID 4248 wrote to memory of 3540	4248	RuntimeBroker.exe	80
PID 3964 wrote to memory of 3372	3964	cmd.exe	82
PID 3964 wrote to memory of 3372	3964	cmd.exe	82
PID 3964 wrote to memory of 3372	3964	cmd.exe	82
PID 3540 wrote to memory of 4180	3540	cmd.exe	83
PID 3540 wrote to memory of 4180	3540	cmd.exe	83
PID 3540 wrote to memory of 4180	3540	cmd.exe	83
PID 3540 wrote to memory of 1988	3540	cmd.exe	84
PID 3540 wrote to memory of 1988	3540	cmd.exe	84
PID 3540 wrote to memory of 1988	3540	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4248
- 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:3964
- - 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:3372
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA0D4.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3540
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4180
- - 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:1988

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

System Information Discovery

1

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
fece27917067365b631bc648c66fe066

SHA1
f12c84b1c2b1296091ee06e8654c7065d22cbb44

SHA256
93e03593374ce40bc5d4c57832ebe96d3a6a532766eb6385f568a0383b426d10

SHA512
9b502a6d46b82ccc2c8aff650de664299f0131a82480eb9cec701546e9cd7f1647c0665014035c19da80a6cab267cf896645af827ecdd95287a70994c1ecb662

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA0D4.tmp.bat

Filesize
157B

MD5
08d5ea8dce9705173997c4f3ad31abf7

SHA1
729077ef616992cd133077e06f2090fe5134342e

SHA256
c4a751b9a31dee682e8bd981f6673614cf8002204ebb48350fb94f8809d59e14

SHA512
0dbc942735dea44d6d27e16a494388bb3a8ec581aa6ba535a153faf9350d12711401ce55d3e76fa784beca2fdb93de353058987a8ae9edeaa1d2b7876e721281

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

Filesize
48KB

MD5
f48dad5d1f222ffbad834e1735942077

SHA1
450940def40ae8cf9b48e7fed829f43802f9a984

SHA256
2039dfbccacc781852e958fd710d12dbd26586c379e97b192c82b0343ee25ae0

SHA512
a8bd8fd998c71cd5291243808f2bafe2fbf65f4d62646fbdf775f66b650f628e8f675fb6b5a7ea2b287efcc457a90e8c1403717e9f5b30bce9136bf78b83e06d

Download Submit
memory/1988-13-0x00000000748E0000-0x0000000075091000-memory.dmp

Filesize
7.7MB

Download
memory/1988-14-0x00000000748E0000-0x0000000075091000-memory.dmp

Filesize
7.7MB

Download
memory/4248-0-0x000000007499E000-0x000000007499F000-memory.dmp

Filesize
4KB

Download
memory/4248-1-0x00000000007B0000-0x00000000007C2000-memory.dmp

Filesize
72KB

Download
memory/4248-2-0x0000000005800000-0x0000000005866000-memory.dmp

Filesize
408KB

Download
memory/4248-3-0x0000000005C80000-0x0000000005D1C000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads