asyncrat | 3ff4956f284c2d0b5a1c8b32e1b73977f05508a814aae92e5aa7919aaf0b3e10

Analysis

max time kernel
150s
max time network
152s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
02-02-2023 18:34

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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

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 8 IoCs

rat

Processes:

resource	yara_rule
\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
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AsyncClient.exe	asyncrat
behavioral1/memory/1156-70-0x00000000009F0000-0x0000000000A0E000-memory.dmp	asyncrat
\Users\Admin\AppData\Roaming\Windows Critical Update.exe	asyncrat
C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe	asyncrat
C:\Users\Admin\AppData\Roaming\Windows Critical Update.exe	asyncrat
behavioral1/memory/1668-82-0x0000000000920000-0x000000000093E000-memory.dmp	asyncrat

Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

732 netsh.exe

pid	process
732	netsh.exe

Drops startup file 3 IoCs

Processes:

wlninit.exe

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

Executes dropped EXE 3 IoCs

Processes:

wlninit.exeAsyncClient.exeWindows Critical Update.exe

pid process

240 wlninit.exe
1156 AsyncClient.exe
1668 Windows Critical Update.exe
Loads dropped DLL 3 IoCs

Processes:

decrypted.exewlninit.execmd.exe

pid process

1236 decrypted.exe
240 wlninit.exe
1732 cmd.exe

pid	process
1236	decrypted.exe
240	wlninit.exe
1732	cmd.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\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\bf4f23b08f31e19e05b45991905c12da = "\"C:\\Users\\Admin\\AppData\\Roaming\\wlninit.exe\" .."	wlninit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\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 opened for modification C:\autorun.inf wlninit.exe
File created D:\autorun.inf wlninit.exe
File created C:\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

1812 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1088 timeout.exe

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

pid	process
1812	schtasks.exe

pid	process
1088	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

wlninit.exe

pid	process
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe
240	wlninit.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

wlninit.exe

pid process

240 wlninit.exe

Suspicious use of AdjustPrivilegeToken 21 IoCs

Processes:

wlninit.exeAsyncClient.exeWindows Critical Update.exe

description	pid	process
Token: SeDebugPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: SeDebugPrivilege	1156	AsyncClient.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: SeDebugPrivilege	1668	Windows Critical Update.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe
Token: 33	240	wlninit.exe
Token: SeIncBasePriorityPrivilege	240	wlninit.exe

Suspicious use of WriteProcessMemory 42 IoCs

Processes:

decrypted.exewlninit.exeAsyncClient.execmd.execmd.exe

description	pid	process	target process
PID 1236 wrote to memory of 240	1236	decrypted.exe	wlninit.exe
PID 1236 wrote to memory of 240	1236	decrypted.exe	wlninit.exe
PID 1236 wrote to memory of 240	1236	decrypted.exe	wlninit.exe
PID 1236 wrote to memory of 240	1236	decrypted.exe	wlninit.exe
PID 240 wrote to memory of 732	240	wlninit.exe	netsh.exe
PID 240 wrote to memory of 732	240	wlninit.exe	netsh.exe
PID 240 wrote to memory of 732	240	wlninit.exe	netsh.exe
PID 240 wrote to memory of 732	240	wlninit.exe	netsh.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 240 wrote to memory of 1156	240	wlninit.exe	AsyncClient.exe
PID 1156 wrote to memory of 1696	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1696	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1696	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1696	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1732	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1732	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1732	1156	AsyncClient.exe	cmd.exe
PID 1156 wrote to memory of 1732	1156	AsyncClient.exe	cmd.exe
PID 1696 wrote to memory of 1812	1696	cmd.exe	schtasks.exe
PID 1696 wrote to memory of 1812	1696	cmd.exe	schtasks.exe
PID 1696 wrote to memory of 1812	1696	cmd.exe	schtasks.exe
PID 1696 wrote to memory of 1812	1696	cmd.exe	schtasks.exe
PID 240 wrote to memory of 1816	240	wlninit.exe	cmd.exe
PID 240 wrote to memory of 1816	240	wlninit.exe	cmd.exe
PID 240 wrote to memory of 1816	240	wlninit.exe	cmd.exe
PID 240 wrote to memory of 1816	240	wlninit.exe	cmd.exe
PID 1732 wrote to memory of 1088	1732	cmd.exe	timeout.exe
PID 1732 wrote to memory of 1088	1732	cmd.exe	timeout.exe
PID 1732 wrote to memory of 1088	1732	cmd.exe	timeout.exe
PID 1732 wrote to memory of 1088	1732	cmd.exe	timeout.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe
PID 1732 wrote to memory of 1668	1732	cmd.exe	Windows Critical Update.exe

C:\Users\Admin\AppData\Local\Temp\decrypted.exe
"C:\Users\Admin\AppData\Local\Temp\decrypted.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1236

C:\Users\Admin\AppData\Roaming\wlninit.exe
"C:\Users\Admin\AppData\Roaming\wlninit.exe"
2⤵
- Drops startup file
- Executes dropped EXE
- Loads dropped DLL
- 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:240

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\wlninit.exe" "wlninit.exe" ENABLE
3⤵
- Modifies Windows Firewall
PID:732

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⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1156

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:1696

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:1812

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE9D3.tmp.bat""
4⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1732

C:\Windows\SysWOW64\timeout.exe
timeout 3
5⤵
- Delays execution with timeout.exe
PID:1088

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:1668

C:\Windows\SysWOW64\cmd.exe
"cmd.exe"
3⤵
PID:1816

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Replication Through Removable Media

T1091

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Replication Through Removable Media

T1091

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE9D3.tmp.bat
Filesize
167B

MD5
88a74a2f689c70d3d9759e5b10b9befb

SHA1
55c186efdd925b010a3cd228c95fedc250bab1b1

SHA256
7abb3dfad5f9ee85559672185fd47a1037d5796a2914d6edfe355976b18df373

SHA512
fce2e9efccd47cfcf77fe9e4006b04af5fbc8d43887b2e1926ac7727e71b4b7bdcfa7af47da44769e62e94d5a7abb8cae572a4ef3e0d845471caa7172fc62eed

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

MD5
1803b28ef79113aaf3c06607db2cca71

SHA1
8f05b9410a1881fb24882c749d4e074ce2cf5c95

SHA256
df8d4da1ef01121a256dcf4c790d77b45756d9f929e821ca7e89cbf85f6b85ad

SHA512
6d2eb07cde6ef8a6ea042df6bcdc4586c36fa5f9f6d6e397c0a961ad2fa5bebd7e4fceb84dfc2e4d85f77635bfd331c7f9e5defbaf3374eb2af7e4b38ab077ce

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

MD5
1803b28ef79113aaf3c06607db2cca71

SHA1
8f05b9410a1881fb24882c749d4e074ce2cf5c95

SHA256
df8d4da1ef01121a256dcf4c790d77b45756d9f929e821ca7e89cbf85f6b85ad

SHA512
6d2eb07cde6ef8a6ea042df6bcdc4586c36fa5f9f6d6e397c0a961ad2fa5bebd7e4fceb84dfc2e4d85f77635bfd331c7f9e5defbaf3374eb2af7e4b38ab077ce

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

MD5
804457c473500f8fe0d57b0864c4c87f

SHA1
633c8ff70bc17c12e2727c3e1278349a8b67fe50

SHA256
601ac6852746a608f82af16fe69b07a5c65afc584d59479a8fcf43bd0537997f

SHA512
f68e765f26d6ff16a4f2a89f367e0cf57278a595f321a362c8b037526106dc319cd6894b4def3d1aa474ce412db0395926e7483d26abca72e196f4eac97247d9

Download Submit
memory/240-62-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/240-65-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/240-57-0x0000000000000000-mapping.dmp

Download
memory/732-63-0x0000000000000000-mapping.dmp

Download
memory/1088-77-0x0000000000000000-mapping.dmp

Download
memory/1156-67-0x0000000000000000-mapping.dmp

Download
memory/1156-70-0x00000000009F0000-0x0000000000A0E000-memory.dmp

Filesize
120KB

Download
memory/1236-61-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/1236-54-0x0000000074F41000-0x0000000074F43000-memory.dmp

Filesize
8KB

Download
memory/1236-55-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/1668-80-0x0000000000000000-mapping.dmp

Download
memory/1668-82-0x0000000000920000-0x000000000093E000-memory.dmp

Filesize
120KB

Download
memory/1696-72-0x0000000000000000-mapping.dmp

Download
memory/1732-73-0x0000000000000000-mapping.dmp

Download
memory/1812-74-0x0000000000000000-mapping.dmp

Download
memory/1816-75-0x0000000000000000-mapping.dmp

Download