asyncrat | 3ff4956f284c2d0b5a1c8b32e1b73977f05508a814aae92e5aa7919aaf0b3e10

General

Target

decrypted.exe
Size

36KB
MD5

804457c473500f8fe0d57b0864c4c87f
SHA1

633c8ff70bc17c12e2727c3e1278349a8b67fe50
SHA256

601ac6852746a608f82af16fe69b07a5c65afc584d59479a8fcf43bd0537997f
SHA512

f68e765f26d6ff16a4f2a89f367e0cf57278a595f321a362c8b037526106dc319cd6894b4def3d1aa474ce412db0395926e7483d26abca72e196f4eac97247d9
SSDEEP

768:C9S2Mfp8Y8JuL8O2qD86BhEOaDUeKR0F6Ehq5lxOBcmZPtqojC:C9S2MfgQQahEOaDUzRb5lxOWmyl

Score

10^/10

asyncrat njrat default evasion persistence rat trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

virtual-rome.at.ply.gg:1111

virtual-rome.at.ply.gg:62832

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
Windows Critical Update.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat

Async RAT payload 5 IoCs

rat

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe	asyncrat
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe	asyncrat
behavioral2/memory/3572-143-0x0000000000D90000-0x0000000000DAE000-memory.dmp	asyncrat
C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe	asyncrat
C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe	asyncrat

Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3316 netsh.exe

pid	process
3316	netsh.exe

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

decrypted.exewlninit.exeAsyncClient.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	decrypted.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	wlninit.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Drops startup file 3 IoCs

Processes:

wlninit.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe	wlninit.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bf4f23b08f31e19e05b45991905c12da.exe	wlninit.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bf4f23b08f31e19e05b45991905c12da.exe	wlninit.exe

Executes dropped EXE 3 IoCs

Processes:

wlninit.exeAsyncClient.exeWindows Critical Update.exe

pid process

4604 wlninit.exe
3572 AsyncClient.exe
3704 Windows Critical Update.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

wlninit.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\bf4f23b08f31e19e05b45991905c12da = "\"C:\\Users\\Admin\\AppData\\Roaming\\wlninit.exe\" .."	wlninit.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\bf4f23b08f31e19e05b45991905c12da = "\"C:\\Users\\Admin\\AppData\\Roaming\\wlninit.exe\" .."	wlninit.exe

Drops autorun.inf file 1 TTPs 3 IoCs
Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media
T1091

Processes:

wlninit.exe

description ioc process

File created C:\autorun.inf wlninit.exe
File opened for modification C:\autorun.inf wlninit.exe
File created D:\autorun.inf wlninit.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

2016 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4100 timeout.exe

description	ioc	process
File created	C:\autorun.inf	wlninit.exe
File opened for modification	C:\autorun.inf	wlninit.exe
File created	D:\autorun.inf	wlninit.exe

pid	process
2016	schtasks.exe

pid	process
4100	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

wlninit.exe

pid	process
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe
4604	wlninit.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

wlninit.exe

pid process

4604 wlninit.exe

Suspicious use of AdjustPrivilegeToken 35 IoCs

Processes:

wlninit.exeAsyncClient.exeWindows Critical Update.exe

description	pid	process
Token: SeDebugPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: SeDebugPrivilege	3572	AsyncClient.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: SeDebugPrivilege	3704	Windows Critical Update.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe
Token: 33	4604	wlninit.exe
Token: SeIncBasePriorityPrivilege	4604	wlninit.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

decrypted.exewlninit.exeAsyncClient.execmd.execmd.exe

description	pid	process	target process
PID 4460 wrote to memory of 4604	4460	decrypted.exe	wlninit.exe
PID 4460 wrote to memory of 4604	4460	decrypted.exe	wlninit.exe
PID 4460 wrote to memory of 4604	4460	decrypted.exe	wlninit.exe
PID 4604 wrote to memory of 3316	4604	wlninit.exe	netsh.exe
PID 4604 wrote to memory of 3316	4604	wlninit.exe	netsh.exe
PID 4604 wrote to memory of 3316	4604	wlninit.exe	netsh.exe
PID 4604 wrote to memory of 3572	4604	wlninit.exe	AsyncClient.exe
PID 4604 wrote to memory of 3572	4604	wlninit.exe	AsyncClient.exe
PID 4604 wrote to memory of 3572	4604	wlninit.exe	AsyncClient.exe
PID 3572 wrote to memory of 2228	3572	AsyncClient.exe	cmd.exe
PID 3572 wrote to memory of 2228	3572	AsyncClient.exe	cmd.exe
PID 3572 wrote to memory of 2228	3572	AsyncClient.exe	cmd.exe
PID 3572 wrote to memory of 1268	3572	AsyncClient.exe	cmd.exe
PID 3572 wrote to memory of 1268	3572	AsyncClient.exe	cmd.exe
PID 3572 wrote to memory of 1268	3572	AsyncClient.exe	cmd.exe
PID 2228 wrote to memory of 2016	2228	cmd.exe	schtasks.exe
PID 2228 wrote to memory of 2016	2228	cmd.exe	schtasks.exe
PID 2228 wrote to memory of 2016	2228	cmd.exe	schtasks.exe
PID 1268 wrote to memory of 4100	1268	cmd.exe	timeout.exe
PID 1268 wrote to memory of 4100	1268	cmd.exe	timeout.exe
PID 1268 wrote to memory of 4100	1268	cmd.exe	timeout.exe
PID 1268 wrote to memory of 3704	1268	cmd.exe	Windows Critical Update.exe
PID 1268 wrote to memory of 3704	1268	cmd.exe	Windows Critical Update.exe
PID 1268 wrote to memory of 3704	1268	cmd.exe	Windows Critical Update.exe

C:\Users\Admin\AppData\Local\Temp\decrypted.exe
"C:\Users\Admin\AppData\Local\Temp\decrypted.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4460

C:\Users\Admin\AppData\Roaming\wlninit.exe
"C:\Users\Admin\AppData\Roaming\wlninit.exe"
2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Drops autorun.inf file
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4604

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\wlninit.exe" "wlninit.exe" ENABLE
3⤵
- Modifies Windows Firewall
PID:3316

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe"
3⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3572

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows Critical Update" /tr '"C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe"' & exit
4⤵
- Suspicious use of WriteProcessMemory
PID:2228

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "Windows Critical Update" /tr '"C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe"'
5⤵
- Creates scheduled task(s)
PID:2016

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4B3.tmp.bat""
4⤵
- Suspicious use of WriteProcessMemory
PID:1268

C:\Windows\SysWOW64\timeout.exe
timeout 3
5⤵
- Delays execution with timeout.exe
PID:4100

C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe
"C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe"
5⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3704

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Replication Through Removable Media

1

T1091

Execution

Scheduled Task

1

T1053

Persistence

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Replication Through Removable Media

1

T1091

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp4B3.tmp.bat
Filesize
166B

MD5
12cfc56d0a473f22aeb959c5bf713dd5

SHA1
15121be7395438fff6877a2096cebcd4a6083667

SHA256
962080a10096ac31463278f5a4c14626eaafba161078e61f31b13d1a2cd81351

SHA512
a0021e497feb58ce4cf7b2d81477cea15a00a13ac69ea27435f95ef19b3dac17decd75a9e8489d181bf7c6dfbb94ddf3a81de25612860f77dda4d6b5cd1f6041

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe
Filesize
96KB

MD5
1803b28ef79113aaf3c06607db2cca71

SHA1
8f05b9410a1881fb24882c749d4e074ce2cf5c95

SHA256
df8d4da1ef01121a256dcf4c790d77b45756d9f929e821ca7e89cbf85f6b85ad

SHA512
6d2eb07cde6ef8a6ea042df6bcdc4586c36fa5f9f6d6e397c0a961ad2fa5bebd7e4fceb84dfc2e4d85f77635bfd331c7f9e5defbaf3374eb2af7e4b38ab077ce

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe
Filesize
96KB

MD5
1803b28ef79113aaf3c06607db2cca71

SHA1
8f05b9410a1881fb24882c749d4e074ce2cf5c95

SHA256
df8d4da1ef01121a256dcf4c790d77b45756d9f929e821ca7e89cbf85f6b85ad

SHA512
6d2eb07cde6ef8a6ea042df6bcdc4586c36fa5f9f6d6e397c0a961ad2fa5bebd7e4fceb84dfc2e4d85f77635bfd331c7f9e5defbaf3374eb2af7e4b38ab077ce

Download Submit
C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe
Filesize
96KB

MD5
1803b28ef79113aaf3c06607db2cca71

SHA1
8f05b9410a1881fb24882c749d4e074ce2cf5c95

SHA256
df8d4da1ef01121a256dcf4c790d77b45756d9f929e821ca7e89cbf85f6b85ad

SHA512
6d2eb07cde6ef8a6ea042df6bcdc4586c36fa5f9f6d6e397c0a961ad2fa5bebd7e4fceb84dfc2e4d85f77635bfd331c7f9e5defbaf3374eb2af7e4b38ab077ce

Download Submit
C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe
Filesize
96KB

MD5
1803b28ef79113aaf3c06607db2cca71

SHA1
8f05b9410a1881fb24882c749d4e074ce2cf5c95

SHA256
df8d4da1ef01121a256dcf4c790d77b45756d9f929e821ca7e89cbf85f6b85ad

SHA512
6d2eb07cde6ef8a6ea042df6bcdc4586c36fa5f9f6d6e397c0a961ad2fa5bebd7e4fceb84dfc2e4d85f77635bfd331c7f9e5defbaf3374eb2af7e4b38ab077ce

Download Submit
C:\Users\Admin\AppData\Roaming\wlninit.exe
Filesize
36KB

MD5
804457c473500f8fe0d57b0864c4c87f

SHA1
633c8ff70bc17c12e2727c3e1278349a8b67fe50

SHA256
601ac6852746a608f82af16fe69b07a5c65afc584d59479a8fcf43bd0537997f

SHA512
f68e765f26d6ff16a4f2a89f367e0cf57278a595f321a362c8b037526106dc319cd6894b4def3d1aa474ce412db0395926e7483d26abca72e196f4eac97247d9

Download Submit
C:\Users\Admin\AppData\Roaming\wlninit.exe
Filesize
36KB

MD5
804457c473500f8fe0d57b0864c4c87f

SHA1
633c8ff70bc17c12e2727c3e1278349a8b67fe50

SHA256
601ac6852746a608f82af16fe69b07a5c65afc584d59479a8fcf43bd0537997f

SHA512
f68e765f26d6ff16a4f2a89f367e0cf57278a595f321a362c8b037526106dc319cd6894b4def3d1aa474ce412db0395926e7483d26abca72e196f4eac97247d9

Download Submit
memory/1268-146-0x0000000000000000-mapping.dmp

Download
memory/2016-147-0x0000000000000000-mapping.dmp

Download
memory/2228-145-0x0000000000000000-mapping.dmp

Download
memory/3316-138-0x0000000000000000-mapping.dmp

Download
memory/3572-143-0x0000000000D90000-0x0000000000DAE000-memory.dmp

Filesize
120KB

Download
memory/3572-144-0x0000000005A70000-0x0000000005B0C000-memory.dmp

Filesize
624KB

Download
memory/3572-140-0x0000000000000000-mapping.dmp

Download
memory/3704-150-0x0000000000000000-mapping.dmp

Download
memory/3704-154-0x0000000005A80000-0x0000000005AE6000-memory.dmp

Filesize
408KB

Download
memory/3704-153-0x0000000005F80000-0x0000000006524000-memory.dmp

Filesize
5.6MB

Download
memory/4100-149-0x0000000000000000-mapping.dmp

Download
memory/4460-132-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download
memory/4460-136-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download
memory/4604-133-0x0000000000000000-mapping.dmp

Download
memory/4604-137-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download
memory/4604-139-0x00000000746D0000-0x0000000074C81000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads