juko | c9a50045508a9301c7090904bea7c3b404077fc5ee8064a670250c1c011aba3c

General

Target
2026-09-30_84ceb005e94b74e215d67df9d75606b4_elex_wannacry.exe
Size 222KB
Sample260930-ly97csxhpe
SHA256 c9a50045508a9301c7090904bea7c3b404077fc5ee8064a670250c1c011aba3c
MD5 84ceb005e94b74e215d67df9d75606b4
SHA1 a13932fc4e6df87945fbe53b5644208a2f6325fd
SHA512 76493452eb0058c47cb03ee66765a6302fb297ae5488d2c579766fe8a87d8ca67733a00699d351d1344efc51b50794a5ab940371e434d8a4bf3e3522b54dfe90
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokS:WkwcERoA28wzmJje7RsHcUTS
TLSH
T192245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 6 IoCs

resource	yara_rule
behavioral2/memory/4948-0-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x0008000000011392-5.dat	family_juko
behavioral2/memory/4948-10-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/memory/3688-12-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x000700000001b872-13.dat	family_juko
behavioral2/memory/4816-16-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3688	WINWORD.exe
4816	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-461973139-3212354679-1508698038-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.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 1 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
1888	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-30_84ceb005e94b74e215d67df9d75606b4_elex_wannacry.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1888	cmd.exe
1788	PING.EXE
5416	PING.EXE
1584	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1788	PING.EXE
5416	PING.EXE
1584	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4948 wrote to memory of 3688	4948	2026-09-30_84ceb005e94b74e215d67df9d75606b4_elex_wannacry.exe	91
PID 3688 wrote to memory of 1888	3688	WINWORD.exe	92
PID 1888 wrote to memory of 1788	1888	cmd.exe	94
PID 1888 wrote to memory of 5416	1888	cmd.exe	95
PID 1888 wrote to memory of 1584	1888	cmd.exe	96
PID 1888 wrote to memory of 4816	1888	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-09-30_84ceb005e94b74e215d67df9d75606b4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-30_84ceb005e94b74e215d67df9d75606b4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4948
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3688
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\000069EA" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1888
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1788
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5416
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1584
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4816

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:1064

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000069EA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000069EA
Size 222KB
SHA256 9f5664681375937b23353676f0930b40e34d8dbb80a951b6325d5364eefdf5b6
MD5 1f757bf5c55943b4c1b317781b43ebd5
SHA1 b96d3d9fa7193d241b552489203a25223c2722d8
SHA512 44260d9aeba1fb78622d79b314a649eb1f7661b4aacbd4b60734d3a6efc41f35a6e244f5d597410edcae1fa5387680df604197a1e44e40708ac1eb8c25e89e26
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUok/:WkwcERoA28wzmJje7RsHcUT/
TLSH
T162245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 222KB
SHA256 c9a50045508a9301c7090904bea7c3b404077fc5ee8064a670250c1c011aba3c
MD5 84ceb005e94b74e215d67df9d75606b4
SHA1 a13932fc4e6df87945fbe53b5644208a2f6325fd
SHA512 76493452eb0058c47cb03ee66765a6302fb297ae5488d2c579766fe8a87d8ca67733a00699d351d1344efc51b50794a5ab940371e434d8a4bf3e3522b54dfe90
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokS:WkwcERoA28wzmJje7RsHcUTS
TLSH
T192245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3688-12-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/4816-16-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/4948-0-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/4948-10-0x0000000000400000-0x0000000000438000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads