asyncrat | 27422b493f93feedb9b1582556828390755561ae6f3f521d5256ad4393d8268c

General

Target
RAT.exe
Size 56KB
Sample261002-gt7s8a1blb
SHA256 27422b493f93feedb9b1582556828390755561ae6f3f521d5256ad4393d8268c
MD5 a3843f7747c609a76b55349ef999870c
SHA1 30bad30fa2975006ddb8d89b21121cf28bc7dc74
SHA512 35f50011c5fd24ab27e5f2fbd1d4d912fa2585f3fdcf87f7b245c09b97d2103be1063701742b301671907894affce48bfb27120c79acb608f75b4fcfc5ed686b
SSDEEP 1536:Cuf09TH2w240lVJj+bSXSheEcZdRkejNUHLTq:CufoTH2w2FTj+bSPRvkINmq
TLSH
T1BB436B0037E9812BF1BE4FB8ACF22145867AF2637603E55D2CC4519B5613BC6D642AFE
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

s666b.casino:443
s666b.casino:8848
s666b.casino: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/0x000800000002430e-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-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	RAT.exe

Executes dropped EXE 2 IoCs

pid	Process
3524	AsyncRat.exe
5068	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
1184	cmd.exe
376	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	AsyncRat.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	AsyncRat.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	RAT.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1660	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
4668	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe
4532	RAT.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4532	RAT.exe
Token: SeDebugPrivilege	3524	AsyncRat.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4532 wrote to memory of 1184	4532	RAT.exe	94
PID 4532 wrote to memory of 376	4532	RAT.exe	96
PID 376 wrote to memory of 1660	376	cmd.exe	98
PID 1184 wrote to memory of 4668	1184	cmd.exe	99
PID 376 wrote to memory of 5068	376	cmd.exe	103

C:\Users\Admin\AppData\Local\Temp\RAT.exe
"C:\Users\Admin\AppData\Local\Temp\RAT.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4532
- 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:1184
- - 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:4668
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8090.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:376
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1660
- - 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:5068

C:\Users\Admin\AppData\Roaming\AsyncRat.exe
"C:\Users\Admin\AppData\Roaming\AsyncRat.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3524

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

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp8090.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp8090.tmp.bat
Size 152B
SHA256 d13b91d300f1026fb9f45920bb49867d99be2a7c2f29ee6f5de0637ab0140882
MD5 62afb0505d474eb7476903346a52ca5d
SHA1 5ce39e75ed7fc6973af7e6adece6620f0f07e684
SHA512 839d4f8a5ca8ccac91f0f566ed775a093f99a1c2e912fea376320387eb585127f8cfd02f13f5a05f87a1766d428f532606be255e5363d7215765aaf99224b819
TLSH
T171C02B4292C5EB1F6C09742313FADCCC91766C5D3F41BB40C30846AE12C054CF0E9341
MD5 SHA1 SHA512 TLSH

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AsyncRat.exe

Path C:\Users\Admin\AppData\Roaming\AsyncRat.exe
Size 56KB
SHA256 27422b493f93feedb9b1582556828390755561ae6f3f521d5256ad4393d8268c
MD5 a3843f7747c609a76b55349ef999870c
SHA1 30bad30fa2975006ddb8d89b21121cf28bc7dc74
SHA512 35f50011c5fd24ab27e5f2fbd1d4d912fa2585f3fdcf87f7b245c09b97d2103be1063701742b301671907894affce48bfb27120c79acb608f75b4fcfc5ed686b
SSDEEP 1536:Cuf09TH2w240lVJj+bSXSheEcZdRkejNUHLTq:CufoTH2w2FTj+bSPRvkINmq
TLSH
T1BB436B0037E9812BF1BE4FB8ACF22145867AF2637603E55D2CC4519B5613BC6D642AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4532-0-0x00000000005A0000-0x00000000005B4000-memory.dmp

Download

memory/4532-1-0x0000000004FB0000-0x0000000004FC0000-memory.dmp

Download

memory/4532-2-0x00000000050C0000-0x000000000515C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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