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
behavioral1/memory/988-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000600000001690d-5.dat	family_juko
behavioral1/memory/988-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4732-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000400000001e6ce-15.dat	family_juko
behavioral1/memory/3168-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3168-18-0x0000000000400000-0x0000000000420000-memory.dmp	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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4732	WINWORD.exe
3168	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-1-5-21-204488895-2999877624-296153668-1000\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	2026-05-19_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

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
1948	PING.EXE
3868	PING.EXE
784	cmd.exe
5088	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5088	PING.EXE
1948	PING.EXE
3868	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 988 wrote to memory of 4732	988	2026-05-19_967a0d175a7b7d03229130413baaa729_elex_wannacry.exe	88
PID 4732 wrote to memory of 784	4732	WINWORD.exe	90
PID 784 wrote to memory of 5088	784	cmd.exe	92
PID 784 wrote to memory of 1948	784	cmd.exe	94
PID 784 wrote to memory of 3868	784	cmd.exe	95
PID 784 wrote to memory of 3168	784	cmd.exe	96

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:988
- 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:4732
- - 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\00001ED9" 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:784
  - - 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:5088
  - - 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:1948
  - - 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:3868
  - - 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:3168

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

00001ED9

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001ED9
Size 49KB
SHA256 f647971b6f2058bbf1d8aab05c0f5723040434d26680fc70d696c33f3542f3c7
MD5 7bf5e73e9c8d6454ec50fdbb1c26681d
SHA1 d41e2b980eb98eb9a0422398ab339db62b1bf367
SHA512 15b6945941ac8f15e01b4a410927574f6f31b153cc944f75bce5a6828d13b1027d835705ab1c57b0132b86aa5b4a86e4875f4c9beb52b0a7eb4ddb694570a883
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2S:4Ly2Kerc64CiGImVu8p4kojWh2S
TLSH
T1C4334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/988-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/988-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3168-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3168-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4732-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads