juko | d0e9840fee84e4305c58536ffac34277e1cfdecba458953a439ca3caf9fc25fb

General

Target
2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe
Size 49KB
Sample260519-krpfmsht8t
SHA256 d0e9840fee84e4305c58536ffac34277e1cfdecba458953a439ca3caf9fc25fb
MD5 967a0d175a7b7d03229130413baaa729
SHA1 c244487f1980358b539a5dfe9cf7e9543b894ab6
SHA512 b3361994a9b291ed51264859bc426c632b43b42aac8717d872ab0e246efc169fc4a2e82eacfa1e258cb2ac1a44b683559a7ff9eaaf9804cb4f0c2fc7ceff2981
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:4Ly2Kerc64CiGImVu8p4kojWh2P
TLSH
T13A334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

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

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/3196-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b109-5.dat	family_juko
behavioral2/memory/3196-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1528-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001c00000002b295-15.dat	family_juko
behavioral2/memory/2284-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2284-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1528	WINWORD.exe
2284	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-1-5-21-2043432456-1617298091-2772621413-1000\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

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	2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe
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

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
3912	cmd.exe
2856	PING.EXE
3512	PING.EXE
4192	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2856	PING.EXE
3512	PING.EXE
4192	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3196 wrote to memory of 1528	3196	2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe	80
PID 1528 wrote to memory of 3912	1528	WINWORD.exe	81
PID 3912 wrote to memory of 2856	3912	cmd.exe	83
PID 3912 wrote to memory of 3512	3912	cmd.exe	84
PID 3912 wrote to memory of 4192	3912	cmd.exe	85
PID 3912 wrote to memory of 2284	3912	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3196
- 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:1528
- - 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\00002C3F" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3912
  - - 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:2856
  - - 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:3512
  - - 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:4192
  - - 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
      System Location Discovery: System Language Discovery
      PID:2284

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002C3F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002C3F
Size 49KB
SHA256 cc2d3094e1d88ee4fe44e960b958186da9719169a6b02ee87bfa61edccbe76df
MD5 bb73456e821c761d3c9de864eb98a0cf
SHA1 d2fa59fd3bfdd3d2e0dc8b7492bffd8ac945ea0b
SHA512 49fde91b41f8accf9894d4d2c5eab93a35ad81573b7f06205ce673e9eaa5236f1b565caedf9531512b563242ddf029c103e4837543074b215f9f1807c091eb7b
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2h:4Ly2Kerc64CiGImVu8p4kojWh2h
TLSH
T1D1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 d0e9840fee84e4305c58536ffac34277e1cfdecba458953a439ca3caf9fc25fb
MD5 967a0d175a7b7d03229130413baaa729
SHA1 c244487f1980358b539a5dfe9cf7e9543b894ab6
SHA512 b3361994a9b291ed51264859bc426c632b43b42aac8717d872ab0e246efc169fc4a2e82eacfa1e258cb2ac1a44b683559a7ff9eaaf9804cb4f0c2fc7ceff2981
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:4Ly2Kerc64CiGImVu8p4kojWh2P
TLSH
T13A334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1528-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2284-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2284-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3196-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3196-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads