juko | 181818da311bd62da5a8dec05595df99ab1a50b2ec753789a40b4763e4450f8e

General

Target
2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe
Size 49KB
Sample260809-vcan2sbd95
SHA256 181818da311bd62da5a8dec05595df99ab1a50b2ec753789a40b4763e4450f8e
MD5 53175d9c5cb0d496b83aa0c9c46ba863
SHA1 902233fb78cb5a8f59c12e019a2ac726c752e770
SHA512 23d0ca0443d6c9aed45d7c55dba3da9fca4c70ac12951521c93e17bacbb37bbf87c512d32be1d94c903751c868deaeffe6d9024c0ea600b85d18b601f729b4c6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2S:4Ly2Kerc64CiGImVu8p4kojWh2S
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3780-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e000000019cd9-5.dat	family_juko
behavioral2/memory/3780-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5000-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ca-13.dat	family_juko
behavioral2/memory/5556-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5556-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5000	WINWORD.exe
5556	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-1-5-21-552508041-2681165170-3229858294-1000\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
1960	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	2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_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
4616	PING.EXE
3820	PING.EXE
3816	PING.EXE
1960	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3820	PING.EXE
3816	PING.EXE
4616	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3780 wrote to memory of 5000	3780	2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe	89
PID 5000 wrote to memory of 1960	5000	WINWORD.exe	90
PID 1960 wrote to memory of 4616	1960	cmd.exe	92
PID 1960 wrote to memory of 3820	1960	cmd.exe	93
PID 1960 wrote to memory of 3816	1960	cmd.exe	94
PID 1960 wrote to memory of 5556	1960	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_53175d9c5cb0d496b83aa0c9c46ba863_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3780
- 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:5000
- - 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\00005C99" 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:1960
  - - 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:4616
  - - 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:3820
  - - 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:3816
  - - 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:5556

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

00005C99

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005C99
Size 49KB
SHA256 50b940a10939a5160a3bcec1c4712be3e277d4720e121e6bd14e9ae97fdf0df3
MD5 1ada577f2c7348378ff7d94395097839
SHA1 ae5fab6e43e402625152b91ec01cef264c92ca4f
SHA512 93c7ceefffcff1ddaddceae92340404fe27ff212256ce7df655dd668fb35b0aad938597e7bad4c54b48c41979a5e1b66acd0e7a5a4b4314ffea1c4057217fc23
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2U:4Ly2Kerc64CiGImVu8p4kojWh2U
TLSH
T1DA334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 181818da311bd62da5a8dec05595df99ab1a50b2ec753789a40b4763e4450f8e
MD5 53175d9c5cb0d496b83aa0c9c46ba863
SHA1 902233fb78cb5a8f59c12e019a2ac726c752e770
SHA512 23d0ca0443d6c9aed45d7c55dba3da9fca4c70ac12951521c93e17bacbb37bbf87c512d32be1d94c903751c868deaeffe6d9024c0ea600b85d18b601f729b4c6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2S:4Ly2Kerc64CiGImVu8p4kojWh2S
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3780-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3780-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5000-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5556-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5556-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads