asyncrat | 1af043d989d217742b8336da946338c9604f409f4c02b24aad6a05351557153b

General

Target
AsyncRAT.exe
Size 56KB
Sample260820-j4bjwasfjf
SHA256 1af043d989d217742b8336da946338c9604f409f4c02b24aad6a05351557153b
MD5 353b3a908f3009ed5a607359608830fd
SHA1 92092f6a0f4c0c895e0303ca5688fec05ff4d333
SHA512 4e5981aca09ee2d2bd6d327e341ad1bbd95fee1fe5b5f72092065d76b8918336a694e6219853cbd83162799d6863cae7a8a6c31b526f349a0f966eeab33fa286
SSDEEP 1536:2uf09TH2w240YikbeXSutKgEiGdNkejNUHLTq:2ufoTH2w2pYikbe7tK55DkINmq
TLSH
T1F3435C0037E9822BF1BE4FB4ACF26144867AF2637603D55D2CC4519B5623FC6DA426FA
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

j8kbet.com:443
j8kbet.com:8848
j8kbet.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/0x0003000000016909-8.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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	AsyncRAT.exe

Executes dropped EXE 2 IoCs

pid	Process
1724	AsyncRat.exe
4400	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
2632	cmd.exe
2520	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
3544	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
1960	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe
5032	AsyncRAT.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5032	AsyncRAT.exe
Token: SeDebugPrivilege	1724	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5032 wrote to memory of 2632	5032	AsyncRAT.exe	86
PID 5032 wrote to memory of 2520	5032	AsyncRAT.exe	88
PID 2520 wrote to memory of 3544	2520	cmd.exe	90
PID 2632 wrote to memory of 1960	2632	cmd.exe	91
PID 2520 wrote to memory of 4400	2520	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:5032
- 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:2632
- - 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:1960
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp941D.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2520
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3544
- - 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:4400

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:1724

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

tmp941D.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp941D.tmp.bat
Size 152B
SHA256 8947bd0b26fd3db536ccba62cdf7dd9fbf920c2970813c21cdabf98301fc44d4
MD5 9d1e7c96d0fa1862bc0b5a8f0c76920f
SHA1 0a3296e6664f75b8af8876267209e8ff4395c1c0
SHA512 ee89a91f8b9fec72bf548098cf574a603f2d9378e0cd236750d03275105b2cd449aa0bd5cf364c71fd9f450293bab502cdf12c4103d97150ae0dae551a6d374a
TLSH
T19CC02B82A3D5EB1F2C0D341313FADC9C91766C993F40BB40C30844ED128064CF4E9341
MD5 SHA1 SHA512 TLSH

Submit Download

AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 1af043d989d217742b8336da946338c9604f409f4c02b24aad6a05351557153b
MD5 353b3a908f3009ed5a607359608830fd
SHA1 92092f6a0f4c0c895e0303ca5688fec05ff4d333
SHA512 4e5981aca09ee2d2bd6d327e341ad1bbd95fee1fe5b5f72092065d76b8918336a694e6219853cbd83162799d6863cae7a8a6c31b526f349a0f966eeab33fa286
SSDEEP 1536:2uf09TH2w240YikbeXSutKgEiGdNkejNUHLTq:2ufoTH2w2pYikbe7tK55DkINmq
TLSH
T1F3435C0037E9822BF1BE4FB4ACF26144867AF2637603D55D2CC4519B5623FC6DA426FA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5032-0-0x00000000005F0000-0x0000000000604000-memory.dmp

Download

memory/5032-1-0x0000000005010000-0x0000000005020000-memory.dmp

Download

memory/5032-2-0x0000000005020000-0x00000000050BC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads