asyncrat | b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b

Analysis

max time kernel
60s
max time network
62s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
06/10/2026, 19:08

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General

Target
b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b.exe
Size 111KB
Sample261006-xtdhdafy6n
SHA256 b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b
MD5 56ac421bd68739ff0bd51e71e4a559df
SHA1 fd156f5f2515feeeea320da9d0b77b4bf80fd522
SHA512 bef921dc8007ca4ab7a21e70e5e01944cc295b0aeb337d8749a690b51df540b20b924df1c7c9aba2b718b00148d46f005eeb7caa8101eee06bd1de5fd8a6054a
SSDEEP 1536:FuUOVTwA4M29KTkDy3bCXS2IJgsdRtKrqi35RwGPJ:FuUyTwA4M29skDy3bC2gs4PwcJ
TLSH
T10AB39E30EFD7B13AED6D4AFC5CA371314926A5D3250EF575FCC0329B46226C1A9322A9
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

oostersekleding.nl:80
oostersekleding.nl:443
www.oostersekleding.nl:80
www.oostersekleding.nl:443

Mutex

j5j0V04Vgqud

Attributes

delay
3
install
true
install_file
ratmalware.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/0x000e00000001c525-10.dat	family_asyncrat

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
5112	cmd.exe
892	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 1 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	b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2680	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
3700	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b.exe
"C:\Users\Admin\AppData\Local\Temp\b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:5968
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ratmalware" /tr '"C:\Users\Admin\AppData\Roaming\ratmalware.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  PID:5112
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "ratmalware" /tr '"C:\Users\Admin\AppData\Roaming\ratmalware.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3700
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp211B.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  PID:892
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2680
- - C:\Users\Admin\AppData\Roaming\ratmalware.exe
    "C:\Users\Admin\AppData\Roaming\ratmalware.exe"
    3⤵
    PID:4344

C:\Users\Admin\AppData\Roaming\ratmalware.exe
"C:\Users\Admin\AppData\Roaming\ratmalware.exe"
1⤵
PID:1912

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 Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp211B.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp211B.tmp.bat
Size 154B
SHA256 087033da113678e98300cacdc18bdc729be28e7542c3e2868a2fd9f479bacbfb
MD5 b21d7460396b2c11f9e46dc6938c4974
SHA1 1e7891bcce4f679821ad789493b0ffe02617eb13
SHA512 92a42a375fe80e070e1aaab555336b7a71a3d3a1bdb1ccbc6a9a3bfd4fd55ac8f1045b8b726ff6caff8021fb56b8f8e23d812b3045631793b07478f5959b7ec6
TLSH
T1DAC08C626AC5AA2E2A05941302BA949C91A769A93F44AF50C34884092680448F099242
MD5 SHA1 SHA512 TLSH

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ratmalware.exe

Path C:\Users\Admin\AppData\Roaming\ratmalware.exe
Size 111KB
SHA256 b199c0c0c5bf14fade787f87c36de6e6bf04dfd213ec63eb64acbbbeada5624b
MD5 56ac421bd68739ff0bd51e71e4a559df
SHA1 fd156f5f2515feeeea320da9d0b77b4bf80fd522
SHA512 bef921dc8007ca4ab7a21e70e5e01944cc295b0aeb337d8749a690b51df540b20b924df1c7c9aba2b718b00148d46f005eeb7caa8101eee06bd1de5fd8a6054a
SSDEEP 1536:FuUOVTwA4M29KTkDy3bCXS2IJgsdRtKrqi35RwGPJ:FuUyTwA4M29skDy3bC2gs4PwcJ
TLSH
T10AB39E30EFD7B13AED6D4AFC5CA371314926A5D3250EF575FCC0329B46226C1A9322A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1912-12-0x0000000074E20000-0x00000000755DC000-memory.dmp

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memory/1912-14-0x0000000074E20000-0x00000000755DC000-memory.dmp

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memory/5968-0-0x0000000074E32000-0x0000000074E33000-memory.dmp

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memory/5968-1-0x0000000000450000-0x0000000000472000-memory.dmp

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memory/5968-2-0x0000000074E20000-0x00000000755DC000-memory.dmp

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memory/5968-3-0x0000000004FA0000-0x000000000503C000-memory.dmp

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memory/5968-9-0x0000000074E20000-0x00000000755DC000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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