asyncrat | 6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411

Analysis

max time kernel
6s
max time network
151s
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, 14:26

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General

Target
6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
Size 45KB
Sample260804-rrzpyacc33
SHA256 6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411
MD5 52a4fbf3fb02a078482cd619793b640e
SHA1 c786ea3a5a3f76f3207dd7ad091dc272559a1a91
SHA512 af0c506ef17a68c335bc73b16ce9a509b1e3967a49fe77fce1e70614baa2a22beeb55136118a6fd26567452d9ea8257627b5eeec779388161f13137946944020
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9GRt3wtOPIrzjbAgX3i2oq7hgcZhH8e73zjxBBDZ8x:0u1YJTHcw23Rs3r3bnXSe7WaKyDjBd8x
TLSH
T1F82319003BE8822BF2BE5F7898F26145467EF5673603D68E1CC441DA5713BC69A42AFD
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

sexybeam.me:80
sexybeam.me:22
sexybeam.me:8080
sexybeam.me:8880
sexybeam.me:2052
sexybeam.me:2082
sexybeam.me:2086
sexybeam.me:2095
sexybeam.me:443
sexybeam.me:2053
sexybeam.me:2083
sexybeam.me:2087
sexybeam.me:2096
sexybeam.me:8443
www.sexybeam.me:80
www.sexybeam.me:22
www.sexybeam.me:8080
www.sexybeam.me:8880
www.sexybeam.me:2052
www.sexybeam.me:2082
www.sexybeam.me:2086
www.sexybeam.me:2095
www.sexybeam.me:443
www.sexybeam.me:2053
www.sexybeam.me:2083
www.sexybeam.me:2087
www.sexybeam.me:2096
www.sexybeam.me:8443
client.sexybeam.me:80
client.sexybeam.me:22
client.sexybeam.me:8080
client.sexybeam.me:8880
client.sexybeam.me:2052
client.sexybeam.me:2082
client.sexybeam.me:2086
client.sexybeam.me:2095
client.sexybeam.me:443
client.sexybeam.me:2053
client.sexybeam.me:2083
client.sexybeam.me:2087
client.sexybeam.me:2096
client.sexybeam.me:8443
notpetya.sexybeam.me:80
notpetya.sexybeam.me:22
notpetya.sexybeam.me:8080
notpetya.sexybeam.me:8880
notpetya.sexybeam.me:2052
notpetya.sexybeam.me:2082
notpetya.sexybeam.me:2086
notpetya.sexybeam.me:2095
notpetya.sexybeam.me:443
notpetya.sexybeam.me:2053
notpetya.sexybeam.me:2083
notpetya.sexybeam.me:2087
notpetya.sexybeam.me:2096
notpetya.sexybeam.me:8443
nimda.sexybeam.me:80
nimda.sexybeam.me:22
nimda.sexybeam.me:8080
nimda.sexybeam.me:8880
nimda.sexybeam.me:2052
nimda.sexybeam.me:2082
nimda.sexybeam.me:2086
nimda.sexybeam.me:2095
nimda.sexybeam.me:443
nimda.sexybeam.me:2053
nimda.sexybeam.me:2083
nimda.sexybeam.me:2087
nimda.sexybeam.me:2096
nimda.sexybeam.me:8443

Mutex

A3gjSPJXB0nE

Attributes

delay
0
install
true
install_file
kcu1we.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/0x000e00000001c581-10.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
6092	kcu1we.exe
1248	kcu1we.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
5924	cmd.exe
1000	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	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.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	kcu1we.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kcu1we.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4300	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
2128	schtasks.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4120 wrote to memory of 5924	4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe	89
PID 4120 wrote to memory of 1000	4120	6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe	91
PID 5924 wrote to memory of 2128	5924	cmd.exe	93
PID 1000 wrote to memory of 4300	1000	cmd.exe	94
PID 1000 wrote to memory of 1248	1000	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe
"C:\Users\Admin\AppData\Local\Temp\6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4120
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "kcu1we" /tr '"C:\Users\Admin\AppData\Roaming\kcu1we.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5924
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "kcu1we" /tr '"C:\Users\Admin\AppData\Roaming\kcu1we.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2128
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2E59.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1000
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4300
- - C:\Users\Admin\AppData\Roaming\kcu1we.exe
    "C:\Users\Admin\AppData\Roaming\kcu1we.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1248

C:\Users\Admin\AppData\Roaming\kcu1we.exe
"C:\Users\Admin\AppData\Roaming\kcu1we.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:6092

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

tmp2E59.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp2E59.tmp.bat
Size 150B
SHA256 cbb1e6bada1b11e5132e5066c768f5de948d88e2386035433ecf1c8997077b50
MD5 1a1554dc2db34a848ab57ad31bc69833
SHA1 af06ea06a224eae52b566435eb0a40ef91074935
SHA512 7195ff7d5de8ba39fd78187b2993b523dbbd15bd9a005e56b06bc09962c6e037e0924eca3065b0e0ecea0345452d8ae040e136d7c4d7789bb253885c919a12ba
TLSH
T190C02B4366CEEA6F3C09645306FADD8C91B26C1A3F80BB10C304481E36C0898F0D9382
MD5 SHA1 SHA512 TLSH

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kcu1we.exe

Path C:\Users\Admin\AppData\Roaming\kcu1we.exe
Size 45KB
SHA256 6420e578c62f6cefa401571662e9945a943077459b0e07828c7d1863fe624411
MD5 52a4fbf3fb02a078482cd619793b640e
SHA1 c786ea3a5a3f76f3207dd7ad091dc272559a1a91
SHA512 af0c506ef17a68c335bc73b16ce9a509b1e3967a49fe77fce1e70614baa2a22beeb55136118a6fd26567452d9ea8257627b5eeec779388161f13137946944020
SSDEEP 768:0u1YJTHwAUgQWUaT2Wmo2q9GRt3wtOPIrzjbAgX3i2oq7hgcZhH8e73zjxBBDZ8x:0u1YJTHcw23Rs3r3bnXSe7WaKyDjBd8x
TLSH
T1F82319003BE8822BF2BE5F7898F26145467EF5673603D68E1CC441DA5713BC69A42AFD
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4120-0-0x0000000074AD2000-0x0000000074AD3000-memory.dmp

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memory/4120-1-0x0000000000A20000-0x0000000000A32000-memory.dmp

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memory/4120-2-0x0000000074AC0000-0x000000007527C000-memory.dmp

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memory/4120-3-0x00000000055B0000-0x000000000564C000-memory.dmp

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memory/4120-9-0x0000000074AC0000-0x000000007527C000-memory.dmp

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memory/6092-12-0x0000000074AC0000-0x000000007527C000-memory.dmp

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memory/6092-14-0x0000000074AC0000-0x000000007527C000-memory.dmp

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