juko | db4f20bdfd8fa0b86eac42414b81c88ad9c56aae11a22de3a9e58e55fc0cfd8e

General

Target
2026-07-01_5b5b9646bb9e8bdfbf58c37e395104c9_elex_wannacry.exe
Size 48KB
Sample260701-n5fmfaft4w
SHA256 db4f20bdfd8fa0b86eac42414b81c88ad9c56aae11a22de3a9e58e55fc0cfd8e
MD5 5b5b9646bb9e8bdfbf58c37e395104c9
SHA1 17f2df6920c16f756e334655ca3261d6cbb1afc4
SHA512 2d238c10ac8ca9a9fb218a9b075d5230c9723a8e55089632f620710b15349f5fac1a3d1a5097537eb07958fbc16b998bca9040cd83b8b3141394e999bffc3f03
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Z:bLy2Kerc64CiGImav42j0h
TLSH
T124234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/6200-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00130000000113ec-5.dat	family_juko
behavioral2/memory/6200-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5988-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c612-13.dat	family_juko
behavioral2/memory/6032-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/6032-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5988	WINWORD.exe
6032	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-1-5-21-2581000985-3042091657-4068028891-1000\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	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	2026-07-01_5b5b9646bb9e8bdfbf58c37e395104c9_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

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
6800	PING.EXE
7064	PING.EXE
2052	PING.EXE
6004	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6800	PING.EXE
7064	PING.EXE
2052	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6200 wrote to memory of 5988	6200	2026-07-01_5b5b9646bb9e8bdfbf58c37e395104c9_elex_wannacry.exe	89
PID 5988 wrote to memory of 6004	5988	WINWORD.exe	90
PID 6004 wrote to memory of 6800	6004	cmd.exe	92
PID 6004 wrote to memory of 7064	6004	cmd.exe	93
PID 6004 wrote to memory of 2052	6004	cmd.exe	94
PID 6004 wrote to memory of 6032	6004	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-01_5b5b9646bb9e8bdfbf58c37e395104c9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_5b5b9646bb9e8bdfbf58c37e395104c9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6200
- 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:5988
- - 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\00004750" 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: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:6800
  - - 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:7064
  - - 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:2052
  - - 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:6032

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

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Downloads

00004750

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004750
Size 48KB
SHA256 87633baed1ee9a942f48e1ee698ffcc76d9b46210158fad5e80eec81f9ddba22
MD5 4e333c9487ab1811f89de0db56c11e5a
SHA1 d15492d6dc93186fa4388c6129bd9998d32bde76
SHA512 55743e43113097f52197cbcb413b7c2e4848a9112c589fd886abf35b85e9204c9e1112731aa34d8595e59576575d866e4fd2382bb6fcbb477ed9c9c1a81da4e5
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8k:bLy2Kerc64CiGImav42j0c
TLSH
T1AF234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 db4f20bdfd8fa0b86eac42414b81c88ad9c56aae11a22de3a9e58e55fc0cfd8e
MD5 5b5b9646bb9e8bdfbf58c37e395104c9
SHA1 17f2df6920c16f756e334655ca3261d6cbb1afc4
SHA512 2d238c10ac8ca9a9fb218a9b075d5230c9723a8e55089632f620710b15349f5fac1a3d1a5097537eb07958fbc16b998bca9040cd83b8b3141394e999bffc3f03
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Z:bLy2Kerc64CiGImav42j0h
TLSH
T124234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5988-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6032-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6032-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6200-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6200-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads