juko | d3ca582d3cac86b78477e850705c97bb8228ebf5a2ea92297c4bd339bd337eb3

General

Target
2026-05-05_9aa673508c02789b21440d447695b658_elex_wannacry.exe
Size 50KB
Sample260505-jpj8gaaz21
SHA256 d3ca582d3cac86b78477e850705c97bb8228ebf5a2ea92297c4bd339bd337eb3
MD5 9aa673508c02789b21440d447695b658
SHA1 ba96b799b1156264f3a9bbbaecb3591ba8fbb7fa
SHA512 8be638efaeea679b6edb9e266b49c654b148083157bf8a4e027bece3659cf847a61de40e26df46d67b6da9bda3972bd42a2a7ea38c87df98ac6cb5677807bd38
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOB:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOB
TLSH
T1CB33281A3B45E1D1C49361B0EC574F74983AECB58E276103BB85B70D2CB2A52CF7298E
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/0x0009000000024425-4.dat	family_juko
behavioral1/files/0x000800000002442a-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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-05-05_9aa673508c02789b21440d447695b658_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3780	WINWORD.exe
1200	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-1-5-21-312252282-3884318443-358092420-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-05_9aa673508c02789b21440d447695b658_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

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
2208	PING.EXE
2164	cmd.exe
3108	PING.EXE
2756	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3108	PING.EXE
2756	PING.EXE
2208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4896 wrote to memory of 3780	4896	2026-05-05_9aa673508c02789b21440d447695b658_elex_wannacry.exe	83
PID 3780 wrote to memory of 2164	3780	WINWORD.exe	85
PID 2164 wrote to memory of 3108	2164	cmd.exe	87
PID 2164 wrote to memory of 2756	2164	cmd.exe	88
PID 2164 wrote to memory of 2208	2164	cmd.exe	91
PID 2164 wrote to memory of 1200	2164	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-05-05_9aa673508c02789b21440d447695b658_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_9aa673508c02789b21440d447695b658_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4896
- 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:3780
- - 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\00007895" 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:2164
  - - 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:3108
  - - 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:2756
  - - 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:2208
  - - 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:1200

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

00007895

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007895
Size 50KB
SHA256 e8ce4948a9557914196063e6c698ec11aa71c45a6f5bf10b856877b56ed73854
MD5 ad729d9879f6bb361d67cd26a4b2fd6f
SHA1 b0ee34540fb1eb4ab5c88b3b2cb366879b0c8d75
SHA512 e1baaeedacb2dff8e73ff7263ccef321c4f6cba23119eef153e6898b6ca161177a310e3968fa4fca5cac0e86190b559ddc7461eca83a69a4042e625952a3a145
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOh:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOh
TLSH
T15A33281A3B45E1D1C49361B0EC574F74983AECB58E276143BB85B70D2CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 d3ca582d3cac86b78477e850705c97bb8228ebf5a2ea92297c4bd339bd337eb3
MD5 9aa673508c02789b21440d447695b658
SHA1 ba96b799b1156264f3a9bbbaecb3591ba8fbb7fa
SHA512 8be638efaeea679b6edb9e266b49c654b148083157bf8a4e027bece3659cf847a61de40e26df46d67b6da9bda3972bd42a2a7ea38c87df98ac6cb5677807bd38
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOB:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOB
TLSH
T1CB33281A3B45E1D1C49361B0EC574F74983AECB58E276103BB85B70D2CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1200-16-0x00000000004F0000-0x00000000004F6000-memory.dmp

Download

memory/3780-13-0x00000000004F0000-0x00000000004F6000-memory.dmp

Download

memory/4896-10-0x00000000004F0000-0x00000000004F6000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads