juko | 689755646cb4f91b5c3f18e7c8b7381adaa903f8fead110321c7e4da749e7117

General

Target
2026-05-31_26f226feec7db358a27737ec64568f59_elex_wannacry.exe
Size 68KB
Sample260531-jefgjact8x
SHA256 689755646cb4f91b5c3f18e7c8b7381adaa903f8fead110321c7e4da749e7117
MD5 26f226feec7db358a27737ec64568f59
SHA1 d0d14f280c7cf4d3d7ab2845c2d64aa88c5df472
SHA512 7d3c01ee0cd23efb298111835f0193494f98543a5216ad2bceb8253cee8396ea5d84e0e047247e9f0e9dcabd60b2051961e11a4a75ed35c133d893c4348895f3
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpM:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpM
TLSH
T19963A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/760-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000b00000002a025-5.dat	family_juko
behavioral2/memory/760-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5384-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b687-15.dat	family_juko
behavioral2/memory/1604-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1604-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5384	WINWORD.exe
1604	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	2026-05-31_26f226feec7db358a27737ec64568f59_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
704	cmd.exe
6004	PING.EXE
4364	PING.EXE
4000	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4000	PING.EXE
6004	PING.EXE
4364	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 760 wrote to memory of 5384	760	2026-05-31_26f226feec7db358a27737ec64568f59_elex_wannacry.exe	79
PID 5384 wrote to memory of 704	5384	WINWORD.exe	80
PID 704 wrote to memory of 6004	704	cmd.exe	82
PID 704 wrote to memory of 4364	704	cmd.exe	83
PID 704 wrote to memory of 4000	704	cmd.exe	84
PID 704 wrote to memory of 1604	704	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-31_26f226feec7db358a27737ec64568f59_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_26f226feec7db358a27737ec64568f59_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:760
- 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:5384
- - 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\0000217B" 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:704
  - - 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:6004
  - - 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:4364
  - - 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:4000
  - - 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:1604

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

0000217B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000217B
Size 68KB
SHA256 3264960dac2085529b77b4bd0954bee31a43a38a6595583989e154f48b048267
MD5 1f4c64196510e5a661951cf89d52618d
SHA1 6a8ce9bcc47f24e6813ff990fafdfd55a878fe0d
SHA512 cd2b5734cb91569664e3b4080e94b72c2013092d00933839babc33cfd2cfc57339c491cc2b2dd780ac3b2a35230ba524940fe94b099ae5f35726cd546a462c07
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wp8:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwp8
TLSH
T1C163A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 689755646cb4f91b5c3f18e7c8b7381adaa903f8fead110321c7e4da749e7117
MD5 26f226feec7db358a27737ec64568f59
SHA1 d0d14f280c7cf4d3d7ab2845c2d64aa88c5df472
SHA512 7d3c01ee0cd23efb298111835f0193494f98543a5216ad2bceb8253cee8396ea5d84e0e047247e9f0e9dcabd60b2051961e11a4a75ed35c133d893c4348895f3
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpM:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpM
TLSH
T19963A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/760-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/760-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1604-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1604-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5384-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads