juko | e5133172d433ab33119bc731f74800ec3c690f4b9712465e5740db4cb3e510a6

General

Target
2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe
Size 216KB
Sample261024-xff2cadv3p
SHA256 e5133172d433ab33119bc731f74800ec3c690f4b9712465e5740db4cb3e510a6
MD5 261ec9d6ec77ffffd86689a70da7a435
SHA1 5e5bf57c435439ae090b756d27b2c54498b39865
SHA512 bebdf666cd07c5fd8083287d6c7592adf26298342f6af0f4a9f937d758f3f1bf5de6141ccd894466e66c0f5e8c42f7fa3e166ce76f5f4f2aa9d30b425e14b863
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgV:uLy2Kwc64YIcyjIDLCSiDaQa
TLSH
T1D3240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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
behavioral1/memory/3340-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x00180000000242b7-4.dat	family_juko
behavioral1/memory/3340-11-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/1812-14-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x000400000001e6f2-15.dat	family_juko
behavioral1/memory/2648-18-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/2648-19-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1812	WINWORD.exe
2648	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-1-5-21-240542094-4193773837-3211495583-1000\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
1224	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-10-22_261ec9d6ec77ffffd86689a70da7a435_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
4352	PING.EXE
1184	PING.EXE
4100	PING.EXE
1224	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4352	PING.EXE
1184	PING.EXE
4100	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3340 wrote to memory of 1812	3340	2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe	88
PID 1812 wrote to memory of 1224	1812	WINWORD.exe	89
PID 1224 wrote to memory of 4352	1224	cmd.exe	91
PID 1224 wrote to memory of 1184	1224	cmd.exe	92
PID 1224 wrote to memory of 4100	1224	cmd.exe	95
PID 1224 wrote to memory of 2648	1224	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3340
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1812
- - 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\000003CA" 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:1224
  - - 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:4352
  - - 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:1184
  - - 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:4100
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2648

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000003CA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000003CA
Size 216KB
SHA256 e6f5a3196746ebc401d190c0380198586b30f7b6eadfbe74aaf9aedb1ce4477a
MD5 6e9ea88a4069f8f05e03b0edd0d44872
SHA1 720aec4ee900394fe995bb72b51c220d1f9248be
SHA512 d8c869f94b8d17b3df7bf491bc69040e2c38159f6fdf74ff66ab09e0f06c2824842c0a1c5da891a9c147d743cc5fb889f07d1be142ba2637a43f9dc071cbff91
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgU:uLy2Kwc64YIcyjIDLCSiDaQT
TLSH
T1B0240A2B905330ACDA17827CD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 216KB
SHA256 e5133172d433ab33119bc731f74800ec3c690f4b9712465e5740db4cb3e510a6
MD5 261ec9d6ec77ffffd86689a70da7a435
SHA1 5e5bf57c435439ae090b756d27b2c54498b39865
SHA512 bebdf666cd07c5fd8083287d6c7592adf26298342f6af0f4a9f937d758f3f1bf5de6141ccd894466e66c0f5e8c42f7fa3e166ce76f5f4f2aa9d30b425e14b863
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgV:uLy2Kwc64YIcyjIDLCSiDaQa
TLSH
T1D3240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1812-14-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2648-18-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2648-19-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3340-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3340-11-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads