juko | 4056e1c75ff981a5384477cd4e43f77072a5833f03bb95d00e69eca4d2b0e5bc

General

Target
2026-07-11_9f7163d51f7ffa84a46afa76cc5b8ee1_elex_wannacry.exe
Size 94KB
Sample260711-s5dkases3p
SHA256 4056e1c75ff981a5384477cd4e43f77072a5833f03bb95d00e69eca4d2b0e5bc
MD5 9f7163d51f7ffa84a46afa76cc5b8ee1
SHA1 154502fba4147b43a5905b2ce30e0b4cf259f145
SHA512 61901213c120af45dee3c3e8e9e06940fa00c2036b1ce4495437026f727de125563e51552a775cf3dd7aa7e4431c0a21bcc9c262e508315db5df7f3c5c2361a4
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N8:RLy2Kerc64CiGImFYgUBWTb4/N8
TLSH
T104937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/5540-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b315-5.dat	family_juko
behavioral2/memory/5540-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4900-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4f0-13.dat	family_juko
behavioral2/memory/4100-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4100-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4900	WINWORD.exe
4100	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-1-5-21-1875162379-3804078649-638427191-1000\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	2026-07-11_9f7163d51f7ffa84a46afa76cc5b8ee1_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
4784	cmd.exe
2780	PING.EXE
1864	PING.EXE
4568	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2780	PING.EXE
1864	PING.EXE
4568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5540 wrote to memory of 4900	5540	2026-07-11_9f7163d51f7ffa84a46afa76cc5b8ee1_elex_wannacry.exe	88
PID 4900 wrote to memory of 4784	4900	WINWORD.exe	89
PID 4784 wrote to memory of 2780	4784	cmd.exe	91
PID 4784 wrote to memory of 1864	4784	cmd.exe	92
PID 4784 wrote to memory of 4568	4784	cmd.exe	93
PID 4784 wrote to memory of 4100	4784	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-11_9f7163d51f7ffa84a46afa76cc5b8ee1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-11_9f7163d51f7ffa84a46afa76cc5b8ee1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5540
- 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:4900
- - 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\000002C0" 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:4784
  - - 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:2780
  - - 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:1864
  - - 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:4568
  - - 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:4100

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

000002C0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000002C0
Size 94KB
SHA256 784fbbfdf91010b62af36ac6b4ec6d3b868b8391665ba919d82167d530e82d4e
MD5 8a9907230decfeb79edc2981d5b90242
SHA1 988b822627c0ab4e5f70a34b3727f4bba24f8d80
SHA512 aab35a5055103d3726a13d221140ca7dd5bd83891a81695781a1c28992320b1472462438d1b84949ac10bd7d4506c4c30a49fe468fbeebfa4537514333808d75
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NT:RLy2Kerc64CiGImFYgUBWTb4/NT
TLSH
T1DD937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 4056e1c75ff981a5384477cd4e43f77072a5833f03bb95d00e69eca4d2b0e5bc
MD5 9f7163d51f7ffa84a46afa76cc5b8ee1
SHA1 154502fba4147b43a5905b2ce30e0b4cf259f145
SHA512 61901213c120af45dee3c3e8e9e06940fa00c2036b1ce4495437026f727de125563e51552a775cf3dd7aa7e4431c0a21bcc9c262e508315db5df7f3c5c2361a4
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N8:RLy2Kerc64CiGImFYgUBWTb4/N8
TLSH
T104937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4100-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4100-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4900-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5540-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5540-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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