asyncrat | 4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0

Analysis

max time kernel
6s
max time network
147s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
21/07/2026, 14:21

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General

Target
4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
Size 45KB
Sample260721-rn3mescq4w
SHA256 4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0
MD5 a695f12673e0f54b6922252f4469d013
SHA1 013d5a9d68ff1473a205089953e87185ee0577fc
SHA512 4a3b79f70f0a44a1ee5694075f4924f633c1c3c3d1792686c7da74d282298e222ef9751d015ae2f8a6b6770a514e0cff3b3bf640c065e34a3d2e56e620dfcccb
SSDEEP 768:cu6RaepTPYzbs8WU+Xaamo2q1t/7c53APIWzjbegX3ymHABKYDbDvBDZUx:cu6YepTPso2cD03lW3bhXC4EK0xdUx
TLSH
T12C232A003BE9812BF2BE4F7898F25145867AF5636603D65E1CC452DB5723BC2CA436ED
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

phimsexvietnamhd.net:80
phimsexvietnamhd.net:22
phimsexvietnamhd.net:8080
phimsexvietnamhd.net:8880
phimsexvietnamhd.net:2052
phimsexvietnamhd.net:2082
phimsexvietnamhd.net:2086
phimsexvietnamhd.net:2095
phimsexvietnamhd.net:443
phimsexvietnamhd.net:2053
phimsexvietnamhd.net:2083
phimsexvietnamhd.net:2087
phimsexvietnamhd.net:2096
phimsexvietnamhd.net:8443
www.phimsexvietnamhd.net:80
www.phimsexvietnamhd.net:22
www.phimsexvietnamhd.net:8080
www.phimsexvietnamhd.net:8880
www.phimsexvietnamhd.net:2052
www.phimsexvietnamhd.net:2082
www.phimsexvietnamhd.net:2086
www.phimsexvietnamhd.net:2095
www.phimsexvietnamhd.net:443
www.phimsexvietnamhd.net:2053
www.phimsexvietnamhd.net:2083
www.phimsexvietnamhd.net:2087
www.phimsexvietnamhd.net:2096
www.phimsexvietnamhd.net:8443
revil.phimsexvietnamhd.net:80
revil.phimsexvietnamhd.net:22
revil.phimsexvietnamhd.net:8080
revil.phimsexvietnamhd.net:8880
revil.phimsexvietnamhd.net:2052
revil.phimsexvietnamhd.net:2082
revil.phimsexvietnamhd.net:2086
revil.phimsexvietnamhd.net:2095
revil.phimsexvietnamhd.net:443
revil.phimsexvietnamhd.net:2053
revil.phimsexvietnamhd.net:2083
revil.phimsexvietnamhd.net:2087
revil.phimsexvietnamhd.net:2096
revil.phimsexvietnamhd.net:8443
blaster.phimsexvietnamhd.net:80
blaster.phimsexvietnamhd.net:22
blaster.phimsexvietnamhd.net:8080
blaster.phimsexvietnamhd.net:8880
blaster.phimsexvietnamhd.net:2052
blaster.phimsexvietnamhd.net:2082
blaster.phimsexvietnamhd.net:2086
blaster.phimsexvietnamhd.net:2095
blaster.phimsexvietnamhd.net:443
blaster.phimsexvietnamhd.net:2053
blaster.phimsexvietnamhd.net:2083
blaster.phimsexvietnamhd.net:2087
blaster.phimsexvietnamhd.net:2096
blaster.phimsexvietnamhd.net:8443

Mutex

qPHf4jxKTvlh

Attributes

delay
0
install
true
install_file
yvvrroks.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
behavioral2/files/0x000d00000001c538-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
244	yvvrroks.exe
4200	yvvrroks.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
3024	cmd.exe
5428	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yvvrroks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yvvrroks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.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

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1340	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
1116	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
Token: SeDebugPrivilege	244	yvvrroks.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 3024	2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe	89
PID 2324 wrote to memory of 5428	2324	4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe	91
PID 5428 wrote to memory of 1340	5428	cmd.exe	93
PID 3024 wrote to memory of 1116	3024	cmd.exe	94
PID 5428 wrote to memory of 4200	5428	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe
"C:\Users\Admin\AppData\Local\Temp\4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2324
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "yvvrroks" /tr '"C:\Users\Admin\AppData\Roaming\yvvrroks.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3024
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "yvvrroks" /tr '"C:\Users\Admin\AppData\Roaming\yvvrroks.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1116
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6596.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5428
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1340
- - C:\Users\Admin\AppData\Roaming\yvvrroks.exe
    "C:\Users\Admin\AppData\Roaming\yvvrroks.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4200

C:\Users\Admin\AppData\Roaming\yvvrroks.exe
"C:\Users\Admin\AppData\Roaming\yvvrroks.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:244

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5500

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp6596.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp6596.tmp.bat
Size 152B
SHA256 f97dac754b4babf2ebb023771858dc4b17c7a17f140188d1c18d2f7f0bdc7027
MD5 b4d3b43f1fd29ab60a24db3e1b92dde8
SHA1 1fb726294b694ce5a6a676407b6507b5ee84f3ad
SHA512 f5e28100670947ba481c16d148d86c60f08bcc9560af62305e6d45941261db6089f3ccee32a95a64b04a0507e2d6c230e68e252c7797b2e183850868d78148c4
TLSH
T1FBC08C8251C9AE0E3805185712BAE98C916268293E44AB10A304421A1280848E0D9341
MD5 SHA1 SHA512 TLSH

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yvvrroks.exe

Path C:\Users\Admin\AppData\Roaming\yvvrroks.exe
Size 45KB
SHA256 4fcf8205fc1bc56d35b37f0b7ac40b8e415190b8dbef38efcde85c1ca723e3b0
MD5 a695f12673e0f54b6922252f4469d013
SHA1 013d5a9d68ff1473a205089953e87185ee0577fc
SHA512 4a3b79f70f0a44a1ee5694075f4924f633c1c3c3d1792686c7da74d282298e222ef9751d015ae2f8a6b6770a514e0cff3b3bf640c065e34a3d2e56e620dfcccb
SSDEEP 768:cu6RaepTPYzbs8WU+Xaamo2q1t/7c53APIWzjbegX3ymHABKYDbDvBDZUx:cu6YepTPso2cD03lW3bhXC4EK0xdUx
TLSH
T12C232A003BE9812BF2BE4F7898F25145867AF5636603D65E1CC452DB5723BC2CA436ED
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/244-12-0x0000000074970000-0x000000007512C000-memory.dmp

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memory/244-14-0x0000000074970000-0x000000007512C000-memory.dmp

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memory/2324-0-0x0000000074982000-0x0000000074983000-memory.dmp

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memory/2324-1-0x0000000000CF0000-0x0000000000D02000-memory.dmp

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memory/2324-2-0x0000000074970000-0x000000007512C000-memory.dmp

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memory/2324-3-0x00000000057F0000-0x000000000588C000-memory.dmp

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memory/2324-9-0x0000000074970000-0x000000007512C000-memory.dmp

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