juko | 16ceeb5a9b791cd79687b3d7bd974e30f6e01e5449b2e01f97a57a9b52d1819e

General

Target
2026-08-14_d891535efe7b1d8c53dc16457f5d75fe_elex_wannacry.exe
Size 87KB
Sample260814-bs2b6a11cs
SHA256 16ceeb5a9b791cd79687b3d7bd974e30f6e01e5449b2e01f97a57a9b52d1819e
MD5 d891535efe7b1d8c53dc16457f5d75fe
SHA1 ed361a207506b50d77f72d198308113abf76a7dc
SHA512 db82a5322ed4ae09523df8ad5b82b8048c7f61c928ea70bdb6ae78e5c9d61557b72d432e3517ce8637d4456c1c9f00abd6f9b4d4e816590f47c780b00060e044
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpr:2Ly2Kerc64CiGIm1K851YO6EQkwpr
TLSH
T16F93A1763A259190C48BD138E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4548-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000b00000001136f-5.dat	family_juko
behavioral2/memory/4548-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4104-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c532-13.dat	family_juko
behavioral2/memory/4600-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4600-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4104	WINWORD.exe
4600	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-1-5-21-3986082593-3624157295-3514260330-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3040	cmd.exe

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	2026-08-14_d891535efe7b1d8c53dc16457f5d75fe_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
3040	cmd.exe
4140	PING.EXE
1808	PING.EXE
6020	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6020	PING.EXE
4140	PING.EXE
1808	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4548 wrote to memory of 4104	4548	2026-08-14_d891535efe7b1d8c53dc16457f5d75fe_elex_wannacry.exe	89
PID 4104 wrote to memory of 3040	4104	WINWORD.exe	90
PID 3040 wrote to memory of 4140	3040	cmd.exe	92
PID 3040 wrote to memory of 1808	3040	cmd.exe	93
PID 3040 wrote to memory of 6020	3040	cmd.exe	94
PID 3040 wrote to memory of 4600	3040	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-14_d891535efe7b1d8c53dc16457f5d75fe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-14_d891535efe7b1d8c53dc16457f5d75fe_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4548
- 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:4104
- - 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\00005412" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3040
  - - 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:4140
  - - 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:1808
  - - 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:6020
  - - 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:4600

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00005412

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005412
Size 87KB
SHA256 50e8dfb086f209a0980acfffbaa0f71f24c95e791d937eafa66dc6e00a6581fd
MD5 8d07b28983cb302b5d5074f56c79420f
SHA1 54f93c89cd5ede7c1f35ea83943cf3e086539c8f
SHA512 85a739ecda9ceb502b0108d6a68de45662ce941066e7ba646a98afc282d1d580bce8a9ceafa5188f0981ae45b95c31fdfba672cb02ddf7e398ad6dd0d9a6f780
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpZ:2Ly2Kerc64CiGIm1K851YO6EQkwpZ
TLSH
T12C93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 16ceeb5a9b791cd79687b3d7bd974e30f6e01e5449b2e01f97a57a9b52d1819e
MD5 d891535efe7b1d8c53dc16457f5d75fe
SHA1 ed361a207506b50d77f72d198308113abf76a7dc
SHA512 db82a5322ed4ae09523df8ad5b82b8048c7f61c928ea70bdb6ae78e5c9d61557b72d432e3517ce8637d4456c1c9f00abd6f9b4d4e816590f47c780b00060e044
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpr:2Ly2Kerc64CiGIm1K851YO6EQkwpr
TLSH
T16F93A1763A259190C48BD138E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4104-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4548-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4548-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4600-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4600-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads