juko | 0d544573cc6d23ed3c58e010317ccf4e6f95a3d7957a5be17fe0d6f376745ca2

General

Target
2026-08-07_f1c93a8a3bbeb9091cc84cdffec1372b_elex_wannacry.exe
Size 94KB
Sample260807-b39fhsdd79
SHA256 0d544573cc6d23ed3c58e010317ccf4e6f95a3d7957a5be17fe0d6f376745ca2
MD5 f1c93a8a3bbeb9091cc84cdffec1372b
SHA1 7a81496e9a536401f1638579ecfe7cf98c551eaf
SHA512 4a4c273c95c82a7d3e3964b91e14dcf03440babc01603dfe36aab8ecfa3e738f92e4ae3f5fb8c522236f13c5439e0ac7a5f215ea8801370b495d0a6803812670
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NP:RLy2Kerc64CiGImFYgUBWTb4/NP
TLSH
T162937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/1588-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x001400000002428f-5.dat	family_juko
behavioral1/memory/1588-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/5004-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00090000000243ca-15.dat	family_juko
behavioral1/memory/3748-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/3748-18-0x0000000000400000-0x000000000042B000-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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-08-07_f1c93a8a3bbeb9091cc84cdffec1372b_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5004	WINWORD.exe
3748	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-1-5-21-204488895-2999877624-296153668-1000\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
2544	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-07_f1c93a8a3bbeb9091cc84cdffec1372b_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

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
948	PING.EXE
4756	PING.EXE
3516	PING.EXE
2544	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
948	PING.EXE
4756	PING.EXE
3516	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1588 wrote to memory of 5004	1588	2026-08-07_f1c93a8a3bbeb9091cc84cdffec1372b_elex_wannacry.exe	86
PID 5004 wrote to memory of 2544	5004	WINWORD.exe	87
PID 2544 wrote to memory of 948	2544	cmd.exe	89
PID 2544 wrote to memory of 4756	2544	cmd.exe	93
PID 2544 wrote to memory of 3516	2544	cmd.exe	96
PID 2544 wrote to memory of 3748	2544	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-08-07_f1c93a8a3bbeb9091cc84cdffec1372b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-07_f1c93a8a3bbeb9091cc84cdffec1372b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1588
- 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:5004
- - 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\0000057F" 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:2544
  - - 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:948
  - - 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:4756
  - - 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:3516
  - - 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:3748

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

0000057F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000057F
Size 94KB
SHA256 340f1277328408d47a597de58d35f7f14871751018c0a111bbfab3737a79a6eb
MD5 3e240d81369b241f0d21140935ce6326
SHA1 13ed7143b33118e770045bbeae444e493611cb38
SHA512 93a07f1bc427b90016b5d6a16f64e042171fd14e07a87678170afec732b5ec22cf50e77f32aa6145aa6459b64251114b5aab0b209268cf8192c777e887b27a66
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N7:RLy2Kerc64CiGImFYgUBWTb4/N7
TLSH
T1A7937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 0d544573cc6d23ed3c58e010317ccf4e6f95a3d7957a5be17fe0d6f376745ca2
MD5 f1c93a8a3bbeb9091cc84cdffec1372b
SHA1 7a81496e9a536401f1638579ecfe7cf98c551eaf
SHA512 4a4c273c95c82a7d3e3964b91e14dcf03440babc01603dfe36aab8ecfa3e738f92e4ae3f5fb8c522236f13c5439e0ac7a5f215ea8801370b495d0a6803812670
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NP:RLy2Kerc64CiGImFYgUBWTb4/NP
TLSH
T162937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1588-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1588-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3748-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3748-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5004-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads