juko | c64d2b3eefacb79f037a8c356967c30966ebf2bb425361858f34fb48a2f0f383

General

Target
2026-04-25_a50ad3cc935bd895319b79bb8e98a831_elex_wannacry.exe
Size 32KB
Sample260425-c24djscy7v
SHA256 c64d2b3eefacb79f037a8c356967c30966ebf2bb425361858f34fb48a2f0f383
MD5 a50ad3cc935bd895319b79bb8e98a831
SHA1 1fc766eeb4bd8fbbf6a076a7b0c450334d553239
SHA512 3f070566cccdb94a9733c9866ed7ba688e401090e2a768d8f1698f5dd5f5bc52e13ebe23642f528cb1af2d0410c7b400a5b3b718d2faeb6dfbc69cba048befc2
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7k:ZLsF2Kerc64sTiX2IV0DKy7k
TLSH
T120E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000f000000024133-4.dat	family_juko
behavioral1/files/0x0008000000024308-14.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-04-25_a50ad3cc935bd895319b79bb8e98a831_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4784	WINWORD.exe
4304	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-1-5-21-2714754311-527593155-1440850301-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-25_a50ad3cc935bd895319b79bb8e98a831_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

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
4552	cmd.exe
4292	PING.EXE
4072	PING.EXE
556	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4292	PING.EXE
4072	PING.EXE
556	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3824 wrote to memory of 4784	3824	2026-04-25_a50ad3cc935bd895319b79bb8e98a831_elex_wannacry.exe	84
PID 4784 wrote to memory of 4552	4784	WINWORD.exe	85
PID 4552 wrote to memory of 4292	4552	cmd.exe	87
PID 4552 wrote to memory of 4072	4552	cmd.exe	88
PID 4552 wrote to memory of 556	4552	cmd.exe	89
PID 4552 wrote to memory of 4304	4552	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-25_a50ad3cc935bd895319b79bb8e98a831_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_a50ad3cc935bd895319b79bb8e98a831_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3824
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4784
- - 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\00004FAE" 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:4552
  - - 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:4292
  - - 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:4072
  - - 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:556
  - - 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:4304

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00004FAE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004FAE
Size 32KB
SHA256 c8c064d8c535e261df4163a5e0dfe75c938fb395031f27ff71fbda17bac32af6
MD5 e430ee54eea4fb7692d1f39f7b9a7c0d
SHA1 ee0d430de32237c967c75528b97655c9b75c085f
SHA512 ace7de62c843c08a2c9c2e7ec6f8820948eb57d454bd980df2e2a1414ce2880b8e54c0f5bdc6ab4f977ac0c774ec3f340d2d2dc7c277022768765370b7022b5c
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf71:ZLsF2Kerc64sTiX2IV0DKy71
TLSH
T16AE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 c64d2b3eefacb79f037a8c356967c30966ebf2bb425361858f34fb48a2f0f383
MD5 a50ad3cc935bd895319b79bb8e98a831
SHA1 1fc766eeb4bd8fbbf6a076a7b0c450334d553239
SHA512 3f070566cccdb94a9733c9866ed7ba688e401090e2a768d8f1698f5dd5f5bc52e13ebe23642f528cb1af2d0410c7b400a5b3b718d2faeb6dfbc69cba048befc2
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7k:ZLsF2Kerc64sTiX2IV0DKy7k
TLSH
T120E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3824-11-0x0000000002140000-0x00000000023C1000-memory.dmp

Download

memory/4304-16-0x0000000002260000-0x00000000024E1000-memory.dmp

Download

memory/4304-18-0x0000000002260000-0x00000000024E1000-memory.dmp

Download

memory/4304-22-0x0000000002260000-0x00000000024E1000-memory.dmp

Download

memory/4304-28-0x0000000002260000-0x00000000024E1000-memory.dmp

Download

memory/4784-13-0x0000000002050000-0x00000000022D1000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads