asyncrat | fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce

Analysis

max time kernel
148s
max time network
153s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
16/08/2026, 18:17

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General

Target
fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
Size 45KB
Sample260816-wxd3msvsb1
SHA256 fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce
MD5 4c11a29b088b3136b73f03a66f9753f7
SHA1 d2fabb322cb989bf97522fef5f986dbc04d55eb5
SHA512 e79fed788849f5f6e009088657ea96e2190dc6fdc61b014cf8dfddec0f56f4fb42ad6ca5f0bbc3c749a5d757340dcee2a593a1188ae57c7cc4c019dbe1e414bb
SSDEEP 768:ju4dNJTbXcZz1WUBHCjmo2qrG8V1RpPEcPIMzjbigX3imFPRZFmpBDZdx:ju4dNJTjOK2L8VDZEhM3bFXSmFPRC3db
TLSH
T130232B0037E9812BF27E4FB8ADF26145867AF2632603D94A1CC441DB5623FC6C6526FE
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

streamforester.name:80
streamforester.name:22
streamforester.name:8080
streamforester.name:8880
streamforester.name:2052
streamforester.name:2082
streamforester.name:2086
streamforester.name:2095
streamforester.name:443
streamforester.name:2053
streamforester.name:2083
streamforester.name:2087
streamforester.name:2096
streamforester.name:8443
www.streamforester.name:80
www.streamforester.name:22
www.streamforester.name:8080
www.streamforester.name:8880
www.streamforester.name:2052
www.streamforester.name:2082
www.streamforester.name:2086
www.streamforester.name:2095
www.streamforester.name:443
www.streamforester.name:2053
www.streamforester.name:2083
www.streamforester.name:2087
www.streamforester.name:2096
www.streamforester.name:8443
malware.streamforester.name:80
malware.streamforester.name:22
malware.streamforester.name:8080
malware.streamforester.name:8880
malware.streamforester.name:2052
malware.streamforester.name:2082
malware.streamforester.name:2086
malware.streamforester.name:2095
malware.streamforester.name:443
malware.streamforester.name:2053
malware.streamforester.name:2083
malware.streamforester.name:2087
malware.streamforester.name:2096
malware.streamforester.name:8443
cryptolocker.streamforester.name:80
cryptolocker.streamforester.name:22
cryptolocker.streamforester.name:8080
cryptolocker.streamforester.name:8880
cryptolocker.streamforester.name:2052
cryptolocker.streamforester.name:2082
cryptolocker.streamforester.name:2086
cryptolocker.streamforester.name:2095
cryptolocker.streamforester.name:443
cryptolocker.streamforester.name:2053
cryptolocker.streamforester.name:2083
cryptolocker.streamforester.name:2087
cryptolocker.streamforester.name:2096
cryptolocker.streamforester.name:8443
industroyer.streamforester.name:80
industroyer.streamforester.name:22
industroyer.streamforester.name:8080
industroyer.streamforester.name:8880
industroyer.streamforester.name:2052
industroyer.streamforester.name:2082
industroyer.streamforester.name:2086
industroyer.streamforester.name:2095
industroyer.streamforester.name:443
industroyer.streamforester.name:2053
industroyer.streamforester.name:2083
industroyer.streamforester.name:2087
industroyer.streamforester.name:2096
industroyer.streamforester.name:8443
locky.streamforester.name:80
locky.streamforester.name:22
locky.streamforester.name:8080
locky.streamforester.name:8880
locky.streamforester.name:2052
locky.streamforester.name:2082
locky.streamforester.name:2086
locky.streamforester.name:2095
locky.streamforester.name:443
locky.streamforester.name:2053
locky.streamforester.name:2083
locky.streamforester.name:2087
locky.streamforester.name:2096
locky.streamforester.name:8443

Mutex

Xqdb46UkwliO

Attributes

delay
0
install
true
install_file
ksku.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/0x001100000001c4fd-10.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
5372	ksku.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
3368	cmd.exe
5580	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 6 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	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ksku.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5804	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
1380	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5856 wrote to memory of 3368	5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe	89
PID 5856 wrote to memory of 5580	5856	fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe	91
PID 3368 wrote to memory of 1380	3368	cmd.exe	93
PID 5580 wrote to memory of 5804	5580	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe
"C:\Users\Admin\AppData\Local\Temp\fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5856
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ksku" /tr '"C:\Users\Admin\AppData\Roaming\ksku.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3368
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "ksku" /tr '"C:\Users\Admin\AppData\Roaming\ksku.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1380
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp522D.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5580
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5804
- - C:\Users\Admin\AppData\Roaming\ksku.exe
    "C:\Users\Admin\AppData\Roaming\ksku.exe"
    3⤵
    PID:5396

C:\Users\Admin\AppData\Roaming\ksku.exe
"C:\Users\Admin\AppData\Roaming\ksku.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:5372

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

tmp522D.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp522D.tmp.bat
Size 148B
SHA256 da08b93566cb917d81656f4c4d7b70550f15e90450e3dc10c012c62a37fcdc13
MD5 d99fa4f4295239390e0c0593c6024f71
SHA1 7c32d1b3a8287d90e6d5046a0edd420046d9dc21
SHA512 9aa9077892c0ef301747a80de00f27417ad7d4203f60892a1d61d795d347d6ce546754f2222c7e03b881409de0b831e48cf19c85124c04682e2707b7fe69af4d
TLSH
T17AC02B5256C5EE0E2809141303FADD8DA1B26D1A3F40BB10C304800E5280449F0F9341
MD5 SHA1 SHA512 TLSH

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ksku.exe

Path C:\Users\Admin\AppData\Roaming\ksku.exe
Size 45KB
SHA256 fc1a1dc63c91a0bc57762b06ff10a2cb5cd93f9d9790d1ea91437667923de3ce
MD5 4c11a29b088b3136b73f03a66f9753f7
SHA1 d2fabb322cb989bf97522fef5f986dbc04d55eb5
SHA512 e79fed788849f5f6e009088657ea96e2190dc6fdc61b014cf8dfddec0f56f4fb42ad6ca5f0bbc3c749a5d757340dcee2a593a1188ae57c7cc4c019dbe1e414bb
SSDEEP 768:ju4dNJTbXcZz1WUBHCjmo2qrG8V1RpPEcPIMzjbigX3imFPRZFmpBDZdx:ju4dNJTjOK2L8VDZEhM3bFXSmFPRC3db
TLSH
T130232B0037E9812BF27E4FB8ADF26145867AF2632603D94A1CC441DB5623FC6C6526FE
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/5372-12-0x0000000073AC2000-0x0000000073AC3000-memory.dmp

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memory/5856-0-0x00000000742A2000-0x00000000742A3000-memory.dmp

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memory/5856-1-0x00000000002A0000-0x00000000002B2000-memory.dmp

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memory/5856-2-0x0000000074290000-0x0000000074A4C000-memory.dmp

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memory/5856-3-0x0000000004CA0000-0x0000000004D3C000-memory.dmp

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memory/5856-8-0x0000000074290000-0x0000000074A4C000-memory.dmp

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