juko | 9ef9bb913d6f33647fe8d255c00fa3f071aaace1c2893ddd23a9c01502868617

General

Target
2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_elex_wannacry.exe
Size 37KB
Sample260724-2sl6caef38
SHA256 9ef9bb913d6f33647fe8d255c00fa3f071aaace1c2893ddd23a9c01502868617
MD5 9dc4202ac71e5c13104c8cf4c56d2d2f
SHA1 f5483517ce8a7fc77e61c3bf2a41579d3af1030a
SHA512 f4b1fa1038230ef4cd17714adaa121c2e0ff497032058703150ee07a41afdb15aaad9bea4ccd20c357d3dec387d61deb3c3bf31dc36642af85639fc75237201c
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaG:3LsF2Kerc64sTiX2IV0Dhuogwl
TLSH
T1EE034C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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 8 IoCs

resource	yara_rule
behavioral1/memory/4592-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b000000024305-5.dat	family_juko
behavioral1/memory/3880-11-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4592-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3880-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000a0000000244d0-16.dat	family_juko
behavioral1/memory/4632-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4632-19-0x0000000000400000-0x000000000041D000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3880	WINWORD.exe
4632	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-1-5-21-876885714-46325919-1482798410-1000\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
2640	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	2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_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
2640	cmd.exe
4272	PING.EXE
1568	PING.EXE
560	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
560	PING.EXE
4272	PING.EXE
1568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4592 wrote to memory of 3880	4592	2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_elex_wannacry.exe	86
PID 3880 wrote to memory of 2640	3880	WINWORD.exe	87
PID 2640 wrote to memory of 4272	2640	cmd.exe	89
PID 2640 wrote to memory of 1568	2640	cmd.exe	90
PID 2640 wrote to memory of 560	2640	cmd.exe	91
PID 2640 wrote to memory of 4632	2640	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4592
- 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:3880
- - 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\00005BD6" 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:2640
  - - 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:4272
  - - 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:1568
  - - 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:560
  - - 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:4632

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

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Downloads

00005BD6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005BD6
Size 37KB
SHA256 5a1672ef956f70c1692557585493bfd70d2616faa6c10cc13f2f8238a3c8103f
MD5 aafd3d96ca688fb70909c208de6143ab
SHA1 1e8c22f3a0de44aa459c63ed80ebd933f4a7b225
SHA512 ddf56238792e95d435b7aface3ec3dc77e02f715c37bf36e2b9338dbf6a547581fe1655d26bbc477f8ea02fc534ff3d7d5d9a5453fad9e73e0b6e507211cdbe5
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaE:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T15F035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 9ef9bb913d6f33647fe8d255c00fa3f071aaace1c2893ddd23a9c01502868617
MD5 9dc4202ac71e5c13104c8cf4c56d2d2f
SHA1 f5483517ce8a7fc77e61c3bf2a41579d3af1030a
SHA512 f4b1fa1038230ef4cd17714adaa121c2e0ff497032058703150ee07a41afdb15aaad9bea4ccd20c357d3dec387d61deb3c3bf31dc36642af85639fc75237201c
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaG:3LsF2Kerc64sTiX2IV0Dhuogwl
TLSH
T1EE034C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3880-11-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3880-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4592-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4592-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4632-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4632-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads