asyncrat | f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7

Analysis

max time kernel
148s
max time network
152s
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, 12:41

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General

Target
f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
Size 45KB
Sample260804-pwv67seq7s
SHA256 f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7
MD5 42154ebe47ce7c9acf856bed84641acb
SHA1 052c60e40ee881d8719227f8ca0b127e5f751a48
SHA512 16d9f9bcdc214b8cacdf9907b48d61468431a8a02550c7ba6b7ae993447a9fbd2848615db619af6656b801768e231db5a30f4d093468252ba535db06f23262ed
SSDEEP 768:ku40ZTX3uXTaWUgzW0mo2qwP3Fo9EaOPIFzjbYgX3i3/BIQMcWLFwsB7eKBDZMx:ku40ZTXEb258Ea3F3bPXSPB3McWL6w72
TLSH
T189232A003BE8816BF2BE4F7899F26145867EF5A32603D68D1CC441DB5713FC69A426FA
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

fimsexvietnam.com:80
fimsexvietnam.com:22
fimsexvietnam.com:8080
fimsexvietnam.com:8880
fimsexvietnam.com:2052
fimsexvietnam.com:2082
fimsexvietnam.com:2086
fimsexvietnam.com:2095
fimsexvietnam.com:443
fimsexvietnam.com:2053
fimsexvietnam.com:2083
fimsexvietnam.com:2087
fimsexvietnam.com:2096
fimsexvietnam.com:8443
www.fimsexvietnam.com:80
www.fimsexvietnam.com:22
www.fimsexvietnam.com:8080
www.fimsexvietnam.com:8880
www.fimsexvietnam.com:2052
www.fimsexvietnam.com:2082
www.fimsexvietnam.com:2086
www.fimsexvietnam.com:2095
www.fimsexvietnam.com:443
www.fimsexvietnam.com:2053
www.fimsexvietnam.com:2083
www.fimsexvietnam.com:2087
www.fimsexvietnam.com:2096
www.fimsexvietnam.com:8443
invasive.fimsexvietnam.com:80
invasive.fimsexvietnam.com:22
invasive.fimsexvietnam.com:8080
invasive.fimsexvietnam.com:8880
invasive.fimsexvietnam.com:2052
invasive.fimsexvietnam.com:2082
invasive.fimsexvietnam.com:2086
invasive.fimsexvietnam.com:2095
invasive.fimsexvietnam.com:443
invasive.fimsexvietnam.com:2053
invasive.fimsexvietnam.com:2083
invasive.fimsexvietnam.com:2087
invasive.fimsexvietnam.com:2096
invasive.fimsexvietnam.com:8443
locky.fimsexvietnam.com:80
locky.fimsexvietnam.com:22
locky.fimsexvietnam.com:8080
locky.fimsexvietnam.com:8880
locky.fimsexvietnam.com:2052
locky.fimsexvietnam.com:2082
locky.fimsexvietnam.com:2086
locky.fimsexvietnam.com:2095
locky.fimsexvietnam.com:443
locky.fimsexvietnam.com:2053
locky.fimsexvietnam.com:2083
locky.fimsexvietnam.com:2087
locky.fimsexvietnam.com:2096
locky.fimsexvietnam.com:8443
malware.fimsexvietnam.com:80
malware.fimsexvietnam.com:22
malware.fimsexvietnam.com:8080
malware.fimsexvietnam.com:8880
malware.fimsexvietnam.com:2052
malware.fimsexvietnam.com:2082
malware.fimsexvietnam.com:2086
malware.fimsexvietnam.com:2095
malware.fimsexvietnam.com:443
malware.fimsexvietnam.com:2053
malware.fimsexvietnam.com:2083
malware.fimsexvietnam.com:2087
malware.fimsexvietnam.com:2096
malware.fimsexvietnam.com:8443

Mutex

55TsADaQ9SP8

Attributes

delay
0
install
true
install_file
4zo63.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/0x000d00000001c55c-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4984	4zo63.exe
384	4zo63.exe

Outbound SSH connection to public host 2 TTPs 4 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	4	104.21.36.7:22
SSH destination	9	172.67.182.173:22
SSH destination	11	104.21.36.7:22
SSH destination	12	172.67.182.173:22

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
3396	cmd.exe
608	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4zo63.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4zo63.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1800	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
5832	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
Token: SeDebugPrivilege	4984	4zo63.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 3396	4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe	89
PID 4900 wrote to memory of 608	4900	f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe	91
PID 3396 wrote to memory of 5832	3396	cmd.exe	93
PID 608 wrote to memory of 1800	608	cmd.exe	94
PID 608 wrote to memory of 384	608	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe
"C:\Users\Admin\AppData\Local\Temp\f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4900
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "4zo63" /tr '"C:\Users\Admin\AppData\Roaming\4zo63.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3396
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "4zo63" /tr '"C:\Users\Admin\AppData\Roaming\4zo63.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5832
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3A02.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:608
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1800
- - C:\Users\Admin\AppData\Roaming\4zo63.exe
    "C:\Users\Admin\AppData\Roaming\4zo63.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:384

C:\Users\Admin\AppData\Roaming\4zo63.exe
"C:\Users\Admin\AppData\Roaming\4zo63.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4984

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

tmp3A02.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3A02.tmp.bat
Size 149B
SHA256 8934f03e96edb84083c098c9ee700f36d42c44e45dafc2dcf09f4730e58ea981
MD5 014f5665386fd70597a6bb8dc166c650
SHA1 ae478f9048725a438f608fcd39b7d9c4caf2aaaa
SHA512 204b5f5f1355c872e302dfae98782e50a058b9e763322e4c11b48cf860d56f351c4c4dc2f93a8ec0dd53aba19a6035c152d024cbda70d320b96c300d909bf035
TLSH
T1D5C02B8395C7EE5F2C05586306FAD48C917B6C1D3F80BB00C384800D23C0C48F0EA341
MD5 SHA1 SHA512 TLSH

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4zo63.exe

Path C:\Users\Admin\AppData\Roaming\4zo63.exe
Size 45KB
SHA256 f71f742b2abde218117737818bb44797b2cf63efaf6ebb668bd9978ebf99cac7
MD5 42154ebe47ce7c9acf856bed84641acb
SHA1 052c60e40ee881d8719227f8ca0b127e5f751a48
SHA512 16d9f9bcdc214b8cacdf9907b48d61468431a8a02550c7ba6b7ae993447a9fbd2848615db619af6656b801768e231db5a30f4d093468252ba535db06f23262ed
SSDEEP 768:ku40ZTX3uXTaWUgzW0mo2qwP3Fo9EaOPIFzjbYgX3i3/BIQMcWLFwsB7eKBDZMx:ku40ZTXEb258Ea3F3bPXSPB3McWL6w72
TLSH
T189232A003BE8816BF2BE4F7899F26145867EF5A32603D68D1CC441DB5713FC69A426FA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4900-0-0x0000000074DF2000-0x0000000074DF3000-memory.dmp

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memory/4900-1-0x0000000000B30000-0x0000000000B42000-memory.dmp

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memory/4900-2-0x0000000074DE0000-0x000000007559C000-memory.dmp

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memory/4900-3-0x0000000005710000-0x00000000057AC000-memory.dmp

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memory/4900-9-0x0000000074DE0000-0x000000007559C000-memory.dmp

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memory/4984-12-0x0000000074DD0000-0x000000007558C000-memory.dmp

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memory/4984-14-0x0000000074DD0000-0x000000007558C000-memory.dmp

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