asyncrat | 4f599e72b5ddb2a68ff5df10bf20ced9a34fa7ca3094f118243ca4461917d270

General

Target
AsyncRAT.exe
Size 56KB
Sample260802-b44lnabd92
SHA256 4f599e72b5ddb2a68ff5df10bf20ced9a34fa7ca3094f118243ca4461917d270
MD5 4eb0b11a7e78416f06d5aad02a3dd380
SHA1 b5f4f315448d8cef903bc70987023632628dfd2f
SHA512 0292e9c46b5bbc48b3b7e61970249b8d6f1e180432ecf1c6b854da49bf65eca07fa0daff0d914d00c2591dde5e630c4f964e0b517fdaecce35b13bd032d513d0
SSDEEP 1536:2uf09TH2w240YikbeXSj+80q34n99R2xdNkejNUHLTq:2ufoTH2w2pYikbeo+8WnYxDkINmq
TLSH
T1E7435C0037E9812AF5BE5FB8ACF22145467AF2737603D94D2CC451CB5A23BC6DA426F9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

bbxbef.za.com:443
bbxbef.za.com:8848
bbxbef.za.com:8080

Mutex

kBVPjakHQ19X

Attributes

delay
3
install
true
install_file
AsyncRat.exe
install_folder
%AppData%

aes.plain

Signatures

Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x001a0000000242f7-8.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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	AsyncRAT.exe

Executes dropped EXE 2 IoCs

pid	Process
5020	AsyncRat.exe
1468	AsyncRat.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1264	cmd.exe
4660	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	AsyncRAT.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncRat.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3816	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
4240	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe
4908	AsyncRAT.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4908	AsyncRAT.exe
Token: SeDebugPrivilege	5020	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 1264	4908	AsyncRAT.exe	86
PID 4908 wrote to memory of 4660	4908	AsyncRAT.exe	88
PID 4660 wrote to memory of 3816	4660	cmd.exe	90
PID 1264 wrote to memory of 4240	1264	cmd.exe	91
PID 4660 wrote to memory of 1468	4660	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\AsyncRAT.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncRAT.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4908
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1264
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "AsyncRat" /tr '"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4240
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7E72.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4660
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3816
- - C:\Users\Admin\AppData\Roaming\AsyncRat.exe
    "C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1468

C:\Users\Admin\AppData\Roaming\AsyncRat.exe
"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:5020

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

AsyncRat.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\AsyncRat.exe.log
Size 522B
SHA256 2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b
MD5 acc9090417037dfa2a55b46ed86e32b8
SHA1 53fa6fb25fb3e88c24d2027aca6ae492b2800a4d
SHA512 d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b
TLSH
T11EF097303722E1E489423F521C1C3A9943EF079AA360EE2C3958036ED825227AB212E3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp7E72.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp7E72.tmp.bat
Size 152B
SHA256 e47a7c95fde0b136f8780ed1c8870761d411d37e77b3da62f1adc2012b1ec5b1
MD5 570f7076b549616db7a32825db8a35a8
SHA1 79e6b1b84dffab3cd761d410ae764b1373526a12
SHA512 799324d4951b780f29f76bb9712d235574198af12736bdb23b03379b36fe7d7c25e8c3f9c94d0c592dcac1feaa318be0f8085ef36d6d0d79657864cc2d00256c
TLSH
T1E0C08C8692C5AA1E6C05741317BAD88C96AAAC593E80AB40C30848A91280548E8AA242
MD5 SHA1 SHA512 TLSH

Submit Download

AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 4f599e72b5ddb2a68ff5df10bf20ced9a34fa7ca3094f118243ca4461917d270
MD5 4eb0b11a7e78416f06d5aad02a3dd380
SHA1 b5f4f315448d8cef903bc70987023632628dfd2f
SHA512 0292e9c46b5bbc48b3b7e61970249b8d6f1e180432ecf1c6b854da49bf65eca07fa0daff0d914d00c2591dde5e630c4f964e0b517fdaecce35b13bd032d513d0
SSDEEP 1536:2uf09TH2w240YikbeXSj+80q34n99R2xdNkejNUHLTq:2ufoTH2w2pYikbeo+8WnYxDkINmq
TLSH
T1E7435C0037E9812AF5BE5FB8ACF22145467AF2737603D94D2CC451CB5A23BC6DA426F9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4908-0-0x0000000000C10000-0x0000000000C24000-memory.dmp

Download

memory/4908-1-0x00000000056C0000-0x00000000056D0000-memory.dmp

Download

memory/4908-2-0x00000000055C0000-0x000000000565C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads