asyncrat | b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c

Analysis

max time kernel
6s
max time network
149s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
04/08/2026, 10:24

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General

Target
b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
Size 45KB
Sample260804-mfkpestsfy
SHA256 b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c
MD5 9476f95d905ec796c8ad70bba7f77cd0
SHA1 fe3ec801a8944fd106ca2761a94f6809f50ba78b
SHA512 5f3079da486a518858979ce7e1118b4a4fd8b474886610720f46a02be0a71e1ae648cab6277e19feb0e44e742907fc2a5b584ad25d40b3c00331252996a27ba2
SSDEEP 768:5udApTNctooWUS7C+mo2qt6wzBNMwpGPIMPzjbjgX3ptfCdv2QfbskBDZ0x:5udApTNmU21WGYvMP3b8X5t6DfISd0x
TLSH
T1D1232B003BD9822BF2BE4F78A8F26145867AF6633603D58D1CC451DB5713BC696426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default command_and_control defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

phimsexvnn.com:80
phimsexvnn.com:22
phimsexvnn.com:8080
phimsexvnn.com:8880
phimsexvnn.com:2052
phimsexvnn.com:2082
phimsexvnn.com:2086
phimsexvnn.com:2095
phimsexvnn.com:443
phimsexvnn.com:2053
phimsexvnn.com:2083
phimsexvnn.com:2087
phimsexvnn.com:2096
phimsexvnn.com:8443
www.phimsexvnn.com:80
www.phimsexvnn.com:22
www.phimsexvnn.com:8080
www.phimsexvnn.com:8880
www.phimsexvnn.com:2052
www.phimsexvnn.com:2082
www.phimsexvnn.com:2086
www.phimsexvnn.com:2095
www.phimsexvnn.com:443
www.phimsexvnn.com:2053
www.phimsexvnn.com:2083
www.phimsexvnn.com:2087
www.phimsexvnn.com:2096
www.phimsexvnn.com:8443
iloveyou.phimsexvnn.com:80
iloveyou.phimsexvnn.com:22
iloveyou.phimsexvnn.com:8080
iloveyou.phimsexvnn.com:8880
iloveyou.phimsexvnn.com:2052
iloveyou.phimsexvnn.com:2082
iloveyou.phimsexvnn.com:2086
iloveyou.phimsexvnn.com:2095
iloveyou.phimsexvnn.com:443
iloveyou.phimsexvnn.com:2053
iloveyou.phimsexvnn.com:2083
iloveyou.phimsexvnn.com:2087
iloveyou.phimsexvnn.com:2096
iloveyou.phimsexvnn.com:8443
mirai.phimsexvnn.com:80
mirai.phimsexvnn.com:22
mirai.phimsexvnn.com:8080
mirai.phimsexvnn.com:8880
mirai.phimsexvnn.com:2052
mirai.phimsexvnn.com:2082
mirai.phimsexvnn.com:2086
mirai.phimsexvnn.com:2095
mirai.phimsexvnn.com:443
mirai.phimsexvnn.com:2053
mirai.phimsexvnn.com:2083
mirai.phimsexvnn.com:2087
mirai.phimsexvnn.com:2096
mirai.phimsexvnn.com:8443

Mutex

VtTOkOzeYqbP

Attributes

delay
0
install
true
install_file
kfef2s.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/0x000e00000001c4be-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
6020	kfef2s.exe
6084	kfef2s.exe

Outbound SSH connection to public host 2 TTPs 2 IoCs

SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

command_and_control

Protocol Tunneling

T1572

Network Service Discovery

T1046

description	flow	ioc
SSH destination	3	172.67.132.249:22
SSH destination	10	104.21.5.48:22

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
4608	cmd.exe
2148	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	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	kfef2s.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kfef2s.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
936	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
5444	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
Token: SeDebugPrivilege	6020	kfef2s.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4332 wrote to memory of 2148	4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe	89
PID 4332 wrote to memory of 4608	4332	b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe	90
PID 2148 wrote to memory of 5444	2148	cmd.exe	93
PID 4608 wrote to memory of 936	4608	cmd.exe	94
PID 4608 wrote to memory of 6084	4608	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe
"C:\Users\Admin\AppData\Local\Temp\b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4332
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "kfef2s" /tr '"C:\Users\Admin\AppData\Roaming\kfef2s.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2148
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "kfef2s" /tr '"C:\Users\Admin\AppData\Roaming\kfef2s.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5444
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC38A.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4608
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:936
- - C:\Users\Admin\AppData\Roaming\kfef2s.exe
    "C:\Users\Admin\AppData\Roaming\kfef2s.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:6084

C:\Users\Admin\AppData\Roaming\kfef2s.exe
"C:\Users\Admin\AppData\Roaming\kfef2s.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:6020

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

Network Service Discovery

T1046

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Protocol Tunneling

T1572

Exfiltration

Impact

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Downloads

tmpC38A.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpC38A.tmp.bat
Size 150B
SHA256 661197f4ab6031bab687418d76bab7caa503023857433a6cf39af05d47771b42
MD5 54f8e89d04b9d73ac90ba27d35510c17
SHA1 f52a3bea4dacc6ca5b65aee2d5f1d237b2ba7481
SHA512 1ed18f323aecc0695d34e8fff8a46b883ef0a2ec321860282c3f94df11e71801659ecbe548fc521bcd6ce83b6da5a9b9843b8e21ed5700c8a69f75c290a089de
TLSH
T129C02B82A1C6EE4E7806145736FAE48DA1726D1D3F40FB00D708409D3680458F0D9341
MD5 SHA1 SHA512 TLSH

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kfef2s.exe

Path C:\Users\Admin\AppData\Roaming\kfef2s.exe
Size 45KB
SHA256 b63b5703c68dc23d4bba90127d26f03b2c5780a39304f256b5b3bc334ba3f27c
MD5 9476f95d905ec796c8ad70bba7f77cd0
SHA1 fe3ec801a8944fd106ca2761a94f6809f50ba78b
SHA512 5f3079da486a518858979ce7e1118b4a4fd8b474886610720f46a02be0a71e1ae648cab6277e19feb0e44e742907fc2a5b584ad25d40b3c00331252996a27ba2
SSDEEP 768:5udApTNctooWUS7C+mo2qt6wzBNMwpGPIMPzjbjgX3ptfCdv2QfbskBDZ0x:5udApTNmU21WGYvMP3b8X5t6DfISd0x
TLSH
T1D1232B003BD9822BF2BE4F78A8F26145867AF6633603D58D1CC451DB5713BC696426FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4332-0-0x0000000074482000-0x0000000074483000-memory.dmp

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memory/4332-1-0x0000000000A40000-0x0000000000A52000-memory.dmp

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memory/4332-2-0x0000000074470000-0x0000000074C2C000-memory.dmp

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memory/4332-3-0x0000000005450000-0x00000000054EC000-memory.dmp

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memory/4332-9-0x0000000074470000-0x0000000074C2C000-memory.dmp

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memory/6020-12-0x0000000074470000-0x0000000074C2C000-memory.dmp

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memory/6020-14-0x0000000074470000-0x0000000074C2C000-memory.dmp

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