asyncrat | 98040733ac189b6a213b5ba69a758f205207beed0f0805ff99ea4566c50f6371

General

Target

RuntimeBroker.exe
Size

48KB
MD5

d9a8b8d68e324839f69ece3a04575db8
SHA1

e62d94e7b067915645d8b6aed6222f90e44c5745
SHA256

98040733ac189b6a213b5ba69a758f205207beed0f0805ff99ea4566c50f6371
SHA512

4e5a0c660d2f0e2941c786c9f1490fef465c1ebf31ce4b76ffca659b1b22312b67632f76df5bf5f1717b46bf84949ded52506f337e8ff5c5806b8fc417743791
SSDEEP

768:Qu+01TQQEX1WUVt1Pmo2qjzzqLCLke9xWRfGtW0budjTPxk7lslvIroPRH4D6cD4:Qu+01TQfb2rLHeSRQ5buxxkhslvIwH4O

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

win-five.gl.at.ply.gg:62867

Mutex

wSVzarUq9UtI

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/0x000300000001e767-10.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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	RuntimeBroker.exe

Executes dropped EXE 1 IoCs

pid	Process
3224	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	schtasks.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
632	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
4412	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe
3244	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3244	RuntimeBroker.exe
Token: SeDebugPrivilege	3224	RuntimeBroker.exe
Token: SeDebugPrivilege	3224	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3244 wrote to memory of 624	3244	RuntimeBroker.exe	87
PID 3244 wrote to memory of 624	3244	RuntimeBroker.exe	87
PID 3244 wrote to memory of 624	3244	RuntimeBroker.exe	87
PID 3244 wrote to memory of 1132	3244	RuntimeBroker.exe	89
PID 3244 wrote to memory of 1132	3244	RuntimeBroker.exe	89
PID 3244 wrote to memory of 1132	3244	RuntimeBroker.exe	89
PID 1132 wrote to memory of 632	1132	cmd.exe	91
PID 1132 wrote to memory of 632	1132	cmd.exe	91
PID 1132 wrote to memory of 632	1132	cmd.exe	91
PID 624 wrote to memory of 4412	624	cmd.exe	92
PID 624 wrote to memory of 4412	624	cmd.exe	92
PID 624 wrote to memory of 4412	624	cmd.exe	92
PID 1132 wrote to memory of 3224	1132	cmd.exe	96
PID 1132 wrote to memory of 3224	1132	cmd.exe	96
PID 1132 wrote to memory of 3224	1132	cmd.exe	96

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:3244
- 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:624
- - 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:4412
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9896.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1132
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:632
- - 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:3224

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\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\tmp9896.tmp.bat

Filesize
157B

MD5
b0c77d029642c505ce66b189efc7a368

SHA1
1c73c2fb3c83359ecd73842eb6ce0dfad8f15e99

SHA256
0b7fc325ac07326bc9f62661179d64fd43e187c75aceed8115348eb33b25bea9

SHA512
d0df7b9f939f6f9fad87d385480d3d893d27cd4e1b53306c96d9527b2e8998bab1275560695f0d418e27852254f3b5304ac226c5ca2cd9bac04bb81ba0d41065

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

Filesize
48KB

MD5
d9a8b8d68e324839f69ece3a04575db8

SHA1
e62d94e7b067915645d8b6aed6222f90e44c5745

SHA256
98040733ac189b6a213b5ba69a758f205207beed0f0805ff99ea4566c50f6371

SHA512
4e5a0c660d2f0e2941c786c9f1490fef465c1ebf31ce4b76ffca659b1b22312b67632f76df5bf5f1717b46bf84949ded52506f337e8ff5c5806b8fc417743791

Download Submit
memory/3224-13-0x0000000075170000-0x0000000075920000-memory.dmp

Filesize
7.7MB

Download
memory/3224-14-0x0000000075170000-0x0000000075920000-memory.dmp

Filesize
7.7MB

Download
memory/3224-15-0x0000000006DB0000-0x0000000007354000-memory.dmp

Filesize
5.6MB

Download
memory/3244-0-0x000000007522E000-0x000000007522F000-memory.dmp

Filesize
4KB

Download
memory/3244-1-0x0000000000C80000-0x0000000000C92000-memory.dmp

Filesize
72KB

Download
memory/3244-2-0x0000000005B40000-0x0000000005BA6000-memory.dmp

Filesize
408KB

Download
memory/3244-3-0x00000000061E0000-0x000000000627C000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads