asyncrat | 6dbb801d621a57c4b4cb499acabaaa597c27db6050a7e98eb22d5111a0d4dea6

General

Target

rex.exe
Size

3.8MB
MD5

f9167c360e2d98e3d6cdc7bd1bbb6bbb
SHA1

5c1f2e1fb6c9767948ef64e822ef53b3059a8410
SHA256

6dbb801d621a57c4b4cb499acabaaa597c27db6050a7e98eb22d5111a0d4dea6
SHA512

d0e5eebe6a786321c3677d79ebbf0149d7fd5c4a0b95e717c8bd49c7f266a8bac9a077a473dd7a5711005afdb2bf9f1d95efed9fa7e2397b41a71b772c1883d6
SSDEEP

1536:Yu6ZdTv2S2deM1+paj/6GUIbJUuBoYudId44:Yu6vTv2S2dr1Aaj/1UIbJUuB4iu4

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

Mutex

WJ7ad2hfOKxk

Attributes

delay
3
install
true
install_file
svchost.exe
install_folder
%Temp%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\svchost.exe	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

svchost.exe

pid process

3036 svchost.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

2452 cmd.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
3036	svchost.exe

pid	process
2452	cmd.exe

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

Processes:

rex.execmd.execmd.exetimeout.exeschtasks.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rex.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	svchost.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

2812 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

Processes:

schtasks.exe

pid process

3032 schtasks.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

rex.exe

pid process

2424 rex.exe
2424 rex.exe
2424 rex.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

rex.exesvchost.exe

description pid process

Token: SeDebugPrivilege 2424 rex.exe
Token: SeDebugPrivilege 3036 svchost.exe

pid	process
2812	timeout.exe

pid	process
3032	schtasks.exe

pid	process
2424	rex.exe
2424	rex.exe
2424	rex.exe

description	pid	process
Token: SeDebugPrivilege	2424	rex.exe
Token: SeDebugPrivilege	3036	svchost.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

rex.execmd.execmd.exe

description	pid	process	target process
PID 2424 wrote to memory of 1076	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 1076	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 1076	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 1076	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 2452	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 2452	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 2452	2424	rex.exe	cmd.exe
PID 2424 wrote to memory of 2452	2424	rex.exe	cmd.exe
PID 1076 wrote to memory of 3032	1076	cmd.exe	schtasks.exe
PID 1076 wrote to memory of 3032	1076	cmd.exe	schtasks.exe
PID 1076 wrote to memory of 3032	1076	cmd.exe	schtasks.exe
PID 1076 wrote to memory of 3032	1076	cmd.exe	schtasks.exe
PID 2452 wrote to memory of 2812	2452	cmd.exe	timeout.exe
PID 2452 wrote to memory of 2812	2452	cmd.exe	timeout.exe
PID 2452 wrote to memory of 2812	2452	cmd.exe	timeout.exe
PID 2452 wrote to memory of 2812	2452	cmd.exe	timeout.exe
PID 2452 wrote to memory of 3036	2452	cmd.exe	svchost.exe
PID 2452 wrote to memory of 3036	2452	cmd.exe	svchost.exe
PID 2452 wrote to memory of 3036	2452	cmd.exe	svchost.exe
PID 2452 wrote to memory of 3036	2452	cmd.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\rex.exe
"C:\Users\Admin\AppData\Local\Temp\rex.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2424

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Local\Temp\svchost.exe"' & exit
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1076

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Local\Temp\svchost.exe"'
3⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
PID:3032

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpB673.tmp.bat""
2⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2452

C:\Windows\SysWOW64\timeout.exe
timeout 3
3⤵
- System Location Discovery: System Language Discovery
- Delays execution with timeout.exe
PID:2812

C:\Users\Admin\AppData\Local\Temp\svchost.exe
"C:\Users\Admin\AppData\Local\Temp\svchost.exe"
3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:3036

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\svchost.exe

Filesize
3.8MB

MD5
f9167c360e2d98e3d6cdc7bd1bbb6bbb

SHA1
5c1f2e1fb6c9767948ef64e822ef53b3059a8410

SHA256
6dbb801d621a57c4b4cb499acabaaa597c27db6050a7e98eb22d5111a0d4dea6

SHA512
d0e5eebe6a786321c3677d79ebbf0149d7fd5c4a0b95e717c8bd49c7f266a8bac9a077a473dd7a5711005afdb2bf9f1d95efed9fa7e2397b41a71b772c1883d6

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB673.tmp.bat

Filesize
154B

MD5
5b6525b026f4a6d93c60e067a4f42ab8

SHA1
f43b400c665875ed733eae2a913c466fe48313b7

SHA256
98ce6441941506894be50891e0ebc578e0d72ccd0dafa3bac73e66a393154205

SHA512
2d85cc3389edc55d24d3713a1d7af5cae676e21dd892c87cb4fda093684581dcb87c21b567cc5dc493fcc2d8832831695107de1dda84f82e748c733bfd6f2f22

Download Submit
memory/2424-0-0x000000007411E000-0x000000007411F000-memory.dmp

Filesize
4KB

Download
memory/2424-1-0x0000000000DF0000-0x0000000000E02000-memory.dmp

Filesize
72KB

Download
memory/2424-2-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/2424-11-0x0000000074110000-0x00000000747FE000-memory.dmp

Filesize
6.9MB

Download
memory/3036-16-0x00000000003E0000-0x00000000003F2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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