juko | 4d633edb41f5fabe9d1b14dd293a04e1ff1ed015b7af704e96b8e13cb49d703a

General

Target
2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe
Size 32KB
Sample260420-lp174aa16s
SHA256 4d633edb41f5fabe9d1b14dd293a04e1ff1ed015b7af704e96b8e13cb49d703a
MD5 dacb5d102ab217a3573323e96389a7e7
SHA1 05b055daf1947d3fcc78731fe4dc2297e9b62d79
SHA512 a571783179b2c59922d3006b3bccb86629a15100657a76da837bf8a477a42cedd500bce90d90139466fd9356bcee345f86da324a24ecbc488ee1600afcd3ac06
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfq:tLsF2Kerc64sTiX2IV0DYQy
TLSH
T192E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000a0000000230e6-4.dat	family_juko
behavioral1/files/0x0009000000024455-12.dat	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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4348	WINWORD.exe
2460	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-1-5-21-312252282-3884318443-358092420-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-15_dacb5d102ab217a3573323e96389a7e7_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
4532	cmd.exe
836	PING.EXE
2380	PING.EXE
368	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
368	PING.EXE
836	PING.EXE
2380	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3488 wrote to memory of 4348	3488	2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe	85
PID 4348 wrote to memory of 4532	4348	WINWORD.exe	86
PID 4532 wrote to memory of 836	4532	cmd.exe	88
PID 4532 wrote to memory of 2380	4532	cmd.exe	89
PID 4532 wrote to memory of 368	4532	cmd.exe	90
PID 4532 wrote to memory of 2460	4532	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3488
- 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:4348
- - 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\00002DD8" 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:4532
  - - 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:836
  - - 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:2380
  - - 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:368
  - - 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:2460

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

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002DD8

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002DD8
Size 32KB
SHA256 1885fa465169d27bf7ad06a421b42615e67cd6b8908b5cae211f431ab1a1b036
MD5 9b131287d3b67d556309b99555b2166b
SHA1 8458700c331f3d6bca8b3e78335cf6849ab42129
SHA512 b8a56d0917830a70be3ac5b5cc0062e1badefeceab19dd164fff6e73d0795fdbba43b07c2abc7558cad93275d05eefcf360441311e2644747eab2be02378cf25
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfZ:tLsF2Kerc64sTiX2IV0DYQh
TLSH
T1B1E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 4d633edb41f5fabe9d1b14dd293a04e1ff1ed015b7af704e96b8e13cb49d703a
MD5 dacb5d102ab217a3573323e96389a7e7
SHA1 05b055daf1947d3fcc78731fe4dc2297e9b62d79
SHA512 a571783179b2c59922d3006b3bccb86629a15100657a76da837bf8a477a42cedd500bce90d90139466fd9356bcee345f86da324a24ecbc488ee1600afcd3ac06
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfq:tLsF2Kerc64sTiX2IV0DYQy
TLSH
T192E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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