juko | 20379775b77e9a13ed1b1817210aac20e470ec3debbf24b6d4adb65a4ad79ca1

General

Target
2026-07-18_d099d3567294a13f496b24a9efbe44b4_elex_wannacry.exe
Size 94KB
Sample260718-mcswmaf16k
SHA256 20379775b77e9a13ed1b1817210aac20e470ec3debbf24b6d4adb65a4ad79ca1
MD5 d099d3567294a13f496b24a9efbe44b4
SHA1 7cf6f00b371160f9f0a4a4df8f3274ccf6887806
SHA512 ee27736c0f219bf5bf3d0b6aa56f49fd6ef72bf198d25456a24a87f7396b5fd24535e17732eb4ea91d8be67fa9742fc13b76edbb0370b1711e75f096e041c76d
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nd:RLy2Kerc64CiGImFYgUBWTb4/Nd
TLSH
T1A6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/5660-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b315-5.dat	family_juko
behavioral2/memory/5660-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4788-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c544-13.dat	family_juko
behavioral2/memory/2116-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2116-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4788	WINWORD.exe
2116	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

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
4168	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	2026-07-18_d099d3567294a13f496b24a9efbe44b4_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
4168	cmd.exe
4208	PING.EXE
5964	PING.EXE
5620	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5620	PING.EXE
4208	PING.EXE
5964	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5660 wrote to memory of 4788	5660	2026-07-18_d099d3567294a13f496b24a9efbe44b4_elex_wannacry.exe	89
PID 4788 wrote to memory of 4168	4788	WINWORD.exe	90
PID 4168 wrote to memory of 4208	4168	cmd.exe	92
PID 4168 wrote to memory of 5964	4168	cmd.exe	93
PID 4168 wrote to memory of 5620	4168	cmd.exe	94
PID 4168 wrote to memory of 2116	4168	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-18_d099d3567294a13f496b24a9efbe44b4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-18_d099d3567294a13f496b24a9efbe44b4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5660
- 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:4788
- - 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\00002F31" 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:4168
  - - 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:4208
  - - 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:5964
  - - 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:5620
  - - 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:2116

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

00002F31

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002F31
Size 94KB
SHA256 5ae8efcc66cee5ad84d51debb6f1dc199b32d2ecc78aa6370cbf2d55d6aa0c70
MD5 1a0292ba22706476af59c42762d794a9
SHA1 309fdee14640c7d3e2d8b85088235c3dc2deb89d
SHA512 d455ea03c9099fe61beb4c870690628302c60189379a7cbf34489f4a92551628def9aeb87b07ea3c511cf1ea0022f8901e0b062add12cc69a279ede62e43bb7b
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Np:RLy2Kerc64CiGImFYgUBWTb4/Np
TLSH
T124937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 20379775b77e9a13ed1b1817210aac20e470ec3debbf24b6d4adb65a4ad79ca1
MD5 d099d3567294a13f496b24a9efbe44b4
SHA1 7cf6f00b371160f9f0a4a4df8f3274ccf6887806
SHA512 ee27736c0f219bf5bf3d0b6aa56f49fd6ef72bf198d25456a24a87f7396b5fd24535e17732eb4ea91d8be67fa9742fc13b76edbb0370b1711e75f096e041c76d
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nd:RLy2Kerc64CiGImFYgUBWTb4/Nd
TLSH
T1A6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2116-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2116-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4788-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5660-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5660-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads