juko | 0363398853ccca6dab2d290cd7f867697e131585503044f41f54b1967d3e32cf

General

Target
2026-08-10_f88986fff3dc6e3d48d4c9b4c2159029_elex_wannacry.exe
Size 30KB
Sample260810-gdlaaasbjb
SHA256 0363398853ccca6dab2d290cd7f867697e131585503044f41f54b1967d3e32cf
MD5 f88986fff3dc6e3d48d4c9b4c2159029
SHA1 497987e1f199505a41bb9246365fac1eb4939cae
SHA512 ba23bcea949f87986e15067049fc366dca274824501c82b5fafeb1a3f95a4c28b0db75b17b049ccfa698b28d13da80671608df31c67eec63bb8128144b8d80c3
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrO:OLsF2Kerc64sTiX2IV0DkFMO
TLSH
T18CE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001100000001b1ad-4.dat	family_juko
behavioral2/files/0x000e00000001c56d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4880	WINWORD.exe
704	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-1-5-21-2115213192-531537726-3295841909-1000\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
5576	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	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	2026-08-10_f88986fff3dc6e3d48d4c9b4c2159029_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

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
5576	cmd.exe
5808	PING.EXE
4740	PING.EXE
4148	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5808	PING.EXE
4740	PING.EXE
4148	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 4880	4908	2026-08-10_f88986fff3dc6e3d48d4c9b4c2159029_elex_wannacry.exe	88
PID 4880 wrote to memory of 5576	4880	WINWORD.exe	89
PID 5576 wrote to memory of 5808	5576	cmd.exe	91
PID 5576 wrote to memory of 4740	5576	cmd.exe	92
PID 5576 wrote to memory of 4148	5576	cmd.exe	93
PID 5576 wrote to memory of 704	5576	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-10_f88986fff3dc6e3d48d4c9b4c2159029_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_f88986fff3dc6e3d48d4c9b4c2159029_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4908
- 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:4880
- - 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\000063B2" 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:5576
  - - 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:5808
  - - 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:4740
  - - 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:4148
  - - 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:704

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

000063B2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000063B2
Size 30KB
SHA256 93690acc223d683a6165dcd63bca4403c115c81771b50d6cf1fc2e9daa90e527
MD5 18ef07220d1ab5cfb389fe3f8d07103c
SHA1 6aed3bb6c0cef438d8894cfb29c8e86756d606d2
SHA512 54f502ad0a409b2cd9cbb70c2ad04f89ec8c580a7fefe8b799515f55618fb35d400ecc88d021483fd3ae102d23854468b0ba9e6bf7fdac0c9b588d026eb78c2c
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrW:OLsF2Kerc64sTiX2IV0DkFMW
TLSH
T1EBE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 0363398853ccca6dab2d290cd7f867697e131585503044f41f54b1967d3e32cf
MD5 f88986fff3dc6e3d48d4c9b4c2159029
SHA1 497987e1f199505a41bb9246365fac1eb4939cae
SHA512 ba23bcea949f87986e15067049fc366dca274824501c82b5fafeb1a3f95a4c28b0db75b17b049ccfa698b28d13da80671608df31c67eec63bb8128144b8d80c3
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrO:OLsF2Kerc64sTiX2IV0DkFMO
TLSH
T18CE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads