juko | de72d9676ab171bec6b1ca66bdae38da7bb29660760e629da90fc59a3c985990

General

Target
2026-07-23_6e9d1cba71cb22c8bcf934ca4c586b9f_elex_wannacry.exe
Size 48KB
Sample260723-jnwj4stepc
SHA256 de72d9676ab171bec6b1ca66bdae38da7bb29660760e629da90fc59a3c985990
MD5 6e9d1cba71cb22c8bcf934ca4c586b9f
SHA1 f04c8ea0ca97d22c5712b52dae6ec9bc715a2974
SHA512 7caebea7c999f1483a63a601df83158ef2535b6fa2260662929bc7855d94eb472f7d6976b882ed69f0bb69410d8dbd45bc2c4d359b85231e94c044182baae23f
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0v
TLSH
T157234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/3504-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001122e-5.dat	family_juko
behavioral2/memory/3504-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4844-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000a000000016bca-13.dat	family_juko
behavioral2/memory/1044-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1044-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4844	WINWORD.exe
1044	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-1-5-21-3611646547-550105268-947503007-1000\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
4108	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	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	2026-07-23_6e9d1cba71cb22c8bcf934ca4c586b9f_elex_wannacry.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
4068	PING.EXE
3104	PING.EXE
4916	PING.EXE
4108	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4916	PING.EXE
4068	PING.EXE
3104	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3504 wrote to memory of 4844	3504	2026-07-23_6e9d1cba71cb22c8bcf934ca4c586b9f_elex_wannacry.exe	89
PID 4844 wrote to memory of 4108	4844	WINWORD.exe	90
PID 4108 wrote to memory of 4068	4108	cmd.exe	92
PID 4108 wrote to memory of 3104	4108	cmd.exe	93
PID 4108 wrote to memory of 4916	4108	cmd.exe	94
PID 4108 wrote to memory of 1044	4108	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-23_6e9d1cba71cb22c8bcf934ca4c586b9f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_6e9d1cba71cb22c8bcf934ca4c586b9f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3504
- 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:4844
- - 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\00004420" 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:4108
  - - 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:4068
  - - 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:3104
  - - 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:4916
  - - 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:1044

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

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Downloads

00004420

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004420
Size 48KB
SHA256 0694c8c85505c68200d4ec6b0a9d4cf4fbd4cfd0cc8ddd98e8ed8e4824c33f6b
MD5 28bbf2d1d9488b066d7ca7e1a73600e3
SHA1 789b5af653c137b31c43a1ed0f86dc873dd2db46
SHA512 35be2f296d2652f54ba3532da90bfc987c85e8696c260e9cff1148462109ed084f50d6ddfbb6bc93ddba52103ec7f24abfb6bfd25907a515060881b0adb03b22
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8I:bLy2Kerc64CiGImav42j0w
TLSH
T140234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 de72d9676ab171bec6b1ca66bdae38da7bb29660760e629da90fc59a3c985990
MD5 6e9d1cba71cb22c8bcf934ca4c586b9f
SHA1 f04c8ea0ca97d22c5712b52dae6ec9bc715a2974
SHA512 7caebea7c999f1483a63a601df83158ef2535b6fa2260662929bc7855d94eb472f7d6976b882ed69f0bb69410d8dbd45bc2c4d359b85231e94c044182baae23f
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0v
TLSH
T157234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1044-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1044-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3504-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3504-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4844-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads