juko | 4737af288ec6a2e39ce0ed20c2e961fa938db38f2eb4c19c472c4a75055e524c

General

Target
2026-07-02_89575b449aebfb9cdac7d8c1dbdf1d9c_elex_wannacry.exe
Size 57KB
Sample260702-2l2bpacx5k
SHA256 4737af288ec6a2e39ce0ed20c2e961fa938db38f2eb4c19c472c4a75055e524c
MD5 89575b449aebfb9cdac7d8c1dbdf1d9c
SHA1 0925e62363749e5a97598421edb3c6a9b3fd1c68
SHA512 2a88839bcf1837808d17419646e6d7d9e41037fb859e2f5e3080d76c6a13b254fb4ca05d86be5caa2519523a73be7017b1ee7c0225b8022e51940817b67d4992
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQF:qLy2Kerc64CiGImklNUyp8TW
TLSH
T1CF433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/1132-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x00190000000118e7-5.dat	family_juko
behavioral2/memory/1132-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4120-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c67f-13.dat	family_juko
behavioral2/memory/4904-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4904-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4120	WINWORD.exe
4904	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-1-5-21-2900715619-172032027-1873877232-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-02_89575b449aebfb9cdac7d8c1dbdf1d9c_elex_wannacry.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
5672	cmd.exe
4276	PING.EXE
3036	PING.EXE
4568	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4276	PING.EXE
3036	PING.EXE
4568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1132 wrote to memory of 4120	1132	2026-07-02_89575b449aebfb9cdac7d8c1dbdf1d9c_elex_wannacry.exe	89
PID 4120 wrote to memory of 5672	4120	WINWORD.exe	90
PID 5672 wrote to memory of 4276	5672	cmd.exe	92
PID 5672 wrote to memory of 3036	5672	cmd.exe	93
PID 5672 wrote to memory of 4568	5672	cmd.exe	94
PID 5672 wrote to memory of 4904	5672	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-02_89575b449aebfb9cdac7d8c1dbdf1d9c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-02_89575b449aebfb9cdac7d8c1dbdf1d9c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1132
- 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:4120
- - 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\00006380" 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:5672
  - - 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:4276
  - - 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:3036
  - - 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:4904

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

Loading Replay Monitor...

Downloads

00006380

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006380
Size 57KB
SHA256 7373f45b1d8813921f5dc0c21f29590fcdc85ea9865c298336f762a490d725ae
MD5 7ec1bf40d8071ca88645b8e26c49f2ee
SHA1 3934c8e2dd6fa83df03c559aa1a3147b15a56e24
SHA512 d187ac9d889dac995f4c5e6eb1ccedf987e20473e5433ad59b5fa93e4e0874a0db55f8f5fab5c57a22a64754e04abce4d466eeed995339bf738c3bda0861c224
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ0:qLy2Kerc64CiGImklNUyp8Tf
TLSH
T157433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 4737af288ec6a2e39ce0ed20c2e961fa938db38f2eb4c19c472c4a75055e524c
MD5 89575b449aebfb9cdac7d8c1dbdf1d9c
SHA1 0925e62363749e5a97598421edb3c6a9b3fd1c68
SHA512 2a88839bcf1837808d17419646e6d7d9e41037fb859e2f5e3080d76c6a13b254fb4ca05d86be5caa2519523a73be7017b1ee7c0225b8022e51940817b67d4992
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQF:qLy2Kerc64CiGImklNUyp8TW
TLSH
T1CF433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1132-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1132-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4120-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4904-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4904-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads