juko | 4ca862228fa39aa62abebaccea7cf59f07694bc77b55f77c95f6ef4f1713844d

General

Target
2026-08-07_f2545cb0d66a79c3c383f2e4684bb424_elex_wannacry.exe
Size 49KB
Sample260807-kyx2cs1dmd
SHA256 4ca862228fa39aa62abebaccea7cf59f07694bc77b55f77c95f6ef4f1713844d
MD5 f2545cb0d66a79c3c383f2e4684bb424
SHA1 dc8b154603bd31c67b2f0cae7cfd7503e9b6676c
SHA512 af427634db80c0aca3fe02b002ecbb205b7068eed725b5556275cedc0642d85238141331b4885fb58efad6ba5802eeb11bee2330bbe3569a0263b8c6591adc92
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2E:VLy2Kerc64CiGImVucp4kojWh2E
TLSH
T159334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/1264-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c000000011377-5.dat	family_juko
behavioral2/memory/1264-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3844-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001100000001c528-13.dat	family_juko
behavioral2/memory/824-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/824-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3844	WINWORD.exe
824	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-1-5-21-3797332335-34111092-3597280141-1000\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
912	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-07_f2545cb0d66a79c3c383f2e4684bb424_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

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
912	cmd.exe
1900	PING.EXE
2080	PING.EXE
3900	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1900	PING.EXE
2080	PING.EXE
3900	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1264 wrote to memory of 3844	1264	2026-08-07_f2545cb0d66a79c3c383f2e4684bb424_elex_wannacry.exe	89
PID 3844 wrote to memory of 912	3844	WINWORD.exe	90
PID 912 wrote to memory of 1900	912	cmd.exe	92
PID 912 wrote to memory of 2080	912	cmd.exe	93
PID 912 wrote to memory of 3900	912	cmd.exe	94
PID 912 wrote to memory of 824	912	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-07_f2545cb0d66a79c3c383f2e4684bb424_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-07_f2545cb0d66a79c3c383f2e4684bb424_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1264
- 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:3844
- - 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\000045CC" 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:912
  - - 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:1900
  - - 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:2080
  - - 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:3900
  - - 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:824

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

000045CC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000045CC
Size 49KB
SHA256 2ad032cbf9f1ea2456ef8ca999076b9a48eabf9f1eb899ac39c6e8141a0eb95c
MD5 289e7420002468b81246de9b07b4c1d0
SHA1 ee99dfadde27f19d11dc71492da25734f46da7e0
SHA512 e5177b0cb58b70ad44e3108e713736a0bd01b5df60a85d204da7f697b38489f31cebe4e4b9b640e07500561d32b3730ca3557f781f53327a30081b9488e76c3c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2H:VLy2Kerc64CiGImVucp4kojWh2H
TLSH
T192334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 4ca862228fa39aa62abebaccea7cf59f07694bc77b55f77c95f6ef4f1713844d
MD5 f2545cb0d66a79c3c383f2e4684bb424
SHA1 dc8b154603bd31c67b2f0cae7cfd7503e9b6676c
SHA512 af427634db80c0aca3fe02b002ecbb205b7068eed725b5556275cedc0642d85238141331b4885fb58efad6ba5802eeb11bee2330bbe3569a0263b8c6591adc92
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2E:VLy2Kerc64CiGImVucp4kojWh2E
TLSH
T159334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/824-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/824-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1264-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1264-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3844-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads