asyncrat | b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5

Analysis

max time kernel
148s
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
02/08/2026, 16:07

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General

Target
b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
Size 45KB
Sample260802-tkpx9sstcx
SHA256 b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5
MD5 7e22a2a69de4a7acde8a02cd35f83221
SHA1 feac1deb4fadc0a67654507be076a3c49da5dd47
SHA512 e3bbcc15c4f4a4c6189c7fe43068fc455cf11b010b3da3b45c06355790155271a97aca8a9e87bd3c73c72f0be4aefb9a823664034fef638560a0048cc722a08c
SSDEEP 768:kuSOpTPTCFcWUeXa6mo2qAaLiE0yFjrdj3kk8PIhxjb8gX3iUIPyALjjaTABDZMx:kuSOpTPOP2KLBXDBhhbTXSUIPVv26dMx
TLSH
T150232B0037E9C12BF2BF4F7859F26145867AF6732603D6891C8451DB5723BC68A42AFE
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

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
mydoom.fimsexvietnam.com:80
mydoom.fimsexvietnam.com:22
mydoom.fimsexvietnam.com:8080
mydoom.fimsexvietnam.com:8880
mydoom.fimsexvietnam.com:2052
mydoom.fimsexvietnam.com:2082
mydoom.fimsexvietnam.com:2086
mydoom.fimsexvietnam.com:2095
mydoom.fimsexvietnam.com:443
mydoom.fimsexvietnam.com:2053
mydoom.fimsexvietnam.com:2083
mydoom.fimsexvietnam.com:2087
mydoom.fimsexvietnam.com:2096
mydoom.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
sasser.fimsexvietnam.com:80
sasser.fimsexvietnam.com:22
sasser.fimsexvietnam.com:8080
sasser.fimsexvietnam.com:8880
sasser.fimsexvietnam.com:2052
sasser.fimsexvietnam.com:2082
sasser.fimsexvietnam.com:2086
sasser.fimsexvietnam.com:2095
sasser.fimsexvietnam.com:443
sasser.fimsexvietnam.com:2053
sasser.fimsexvietnam.com:2083
sasser.fimsexvietnam.com:2087
sasser.fimsexvietnam.com:2096
sasser.fimsexvietnam.com:8443

Mutex

nGKsXNWgDzPo

Attributes

delay
0
install
true
install_file
m6c8.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/0x0005000000016b3f-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2056	m6c8.exe
2628	m6c8.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
1328	cmd.exe
4728	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m6c8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	m6c8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5056	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
4284	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4980 wrote to memory of 1328	4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe	89
PID 4980 wrote to memory of 4728	4980	b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe	90
PID 4728 wrote to memory of 5056	4728	cmd.exe	93
PID 1328 wrote to memory of 4284	1328	cmd.exe	94
PID 4728 wrote to memory of 2628	4728	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe
"C:\Users\Admin\AppData\Local\Temp\b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4980
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "m6c8" /tr '"C:\Users\Admin\AppData\Roaming\m6c8.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1328
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "m6c8" /tr '"C:\Users\Admin\AppData\Roaming\m6c8.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4284
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD16.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4728
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5056
- - C:\Users\Admin\AppData\Roaming\m6c8.exe
    "C:\Users\Admin\AppData\Roaming\m6c8.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2628

C:\Users\Admin\AppData\Roaming\m6c8.exe
"C:\Users\Admin\AppData\Roaming\m6c8.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2056

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

Replay Monitor

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Downloads

tmpD16.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpD16.tmp.bat
Size 147B
SHA256 0b746142cf771f7519adbde77d7417814586527ea5f03e7a36a786813505d22c
MD5 4bde689654cbd21997c068b4792dc61b
SHA1 77b0bb31e125a5a78d9aace05038e7de729d9426
SHA512 30f0c505810aeef295795ed8fca2c86886071af450f3d21690272ef712ed75c104f58c379a08aa38c983c00bf4e8d8ccb97e5441f568c43e9528844f9da4833b
TLSH
T1D7C02B5351C5FA5E3805141306FAD4ACA1726C5A3F80FF80D304440D128084CF0DA341
MD5 SHA1 SHA512 TLSH

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m6c8.exe

Path C:\Users\Admin\AppData\Roaming\m6c8.exe
Size 45KB
SHA256 b73a8349b1918bdcb6af8530dbfd71c5f71240ea81e377404aee18bd6d8bb0c5
MD5 7e22a2a69de4a7acde8a02cd35f83221
SHA1 feac1deb4fadc0a67654507be076a3c49da5dd47
SHA512 e3bbcc15c4f4a4c6189c7fe43068fc455cf11b010b3da3b45c06355790155271a97aca8a9e87bd3c73c72f0be4aefb9a823664034fef638560a0048cc722a08c
SSDEEP 768:kuSOpTPTCFcWUeXa6mo2qAaLiE0yFjrdj3kk8PIhxjb8gX3iUIPyALjjaTABDZMx:kuSOpTPOP2KLBXDBhhbTXSUIPVv26dMx
TLSH
T150232B0037E9C12BF2BF4F7859F26145867AF6732603D6891C8451DB5723BC68A42AFE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2056-12-0x0000000074500000-0x0000000074CBC000-memory.dmp

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memory/2056-14-0x0000000074500000-0x0000000074CBC000-memory.dmp

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memory/4980-0-0x0000000074682000-0x0000000074683000-memory.dmp

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memory/4980-1-0x0000000000960000-0x0000000000972000-memory.dmp

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memory/4980-2-0x0000000074670000-0x0000000074E2C000-memory.dmp

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memory/4980-3-0x0000000005470000-0x000000000550C000-memory.dmp

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memory/4980-8-0x0000000074670000-0x0000000074E2C000-memory.dmp

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