juko | ddcf2ed8bc6dd391edd67a19c721fd283910b5877ab800cc86bb1312456cebb3

General

Target
2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe
Size 32KB
Sample260529-hcn58aev21
SHA256 ddcf2ed8bc6dd391edd67a19c721fd283910b5877ab800cc86bb1312456cebb3
MD5 ace81f8e15a8308008061f5bbafe289a
SHA1 aadb17d412248ea7832f95ffe6f1d9730c41d4cd
SHA512 87851f8bbd60428f55b43f1148402f9d234f0a6e9fd6de4111ef958d9db27a144e1b6355339d70b7d71c07c7acd4345272ffb3749ad5b642f6323726683db70f
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpf:OLsF2Kerc64sTiX2IV0Dhuf
TLSH
T125E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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
behavioral2/files/0x000a00000002a025-4.dat	family_juko
behavioral2/files/0x001b00000002b690-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
8	WINWORD.exe
3336	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-1-5-21-226940941-599731907-2645636698-1000\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	2026-05-29_ace81f8e15a8308008061f5bbafe289a_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
5296	cmd.exe
4780	PING.EXE
5988	PING.EXE
2428	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4780	PING.EXE
5988	PING.EXE
2428	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4768 wrote to memory of 8	4768	2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe	80
PID 8 wrote to memory of 5296	8	WINWORD.exe	81
PID 5296 wrote to memory of 4780	5296	cmd.exe	83
PID 5296 wrote to memory of 5988	5296	cmd.exe	84
PID 5296 wrote to memory of 2428	5296	cmd.exe	85
PID 5296 wrote to memory of 3336	5296	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_ace81f8e15a8308008061f5bbafe289a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4768
- 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:8
- - 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\00000E30" 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:5296
  - - 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:4780
  - - 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:5988
  - - 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:2428
  - - 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:3336

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

Replay Monitor

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Downloads

00000E30

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000E30
Size 32KB
SHA256 942ce813a19abda8bb749d102111e292de59255e8ca6379098400398398fa967
MD5 3512e8fea61e4246516f1d2edff74f10
SHA1 7da3c4595f55a11006c70dc705a57b7788874a35
SHA512 fa8042c26b8b2085a6ce2a46656bc52cf7aa4d916ce07cdd9a8869108fd1ef7da90a43726a55ab12e13a07b3ffd0e2ff9af246d2a8304023e3488fa3d3b20956
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpU:OLsF2Kerc64sTiX2IV0DhuU
TLSH
T190E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 ddcf2ed8bc6dd391edd67a19c721fd283910b5877ab800cc86bb1312456cebb3
MD5 ace81f8e15a8308008061f5bbafe289a
SHA1 aadb17d412248ea7832f95ffe6f1d9730c41d4cd
SHA512 87851f8bbd60428f55b43f1148402f9d234f0a6e9fd6de4111ef958d9db27a144e1b6355339d70b7d71c07c7acd4345272ffb3749ad5b642f6323726683db70f
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpf:OLsF2Kerc64sTiX2IV0Dhuf
TLSH
T125E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads