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 7 IoCs

resource	yara_rule
behavioral2/memory/4376-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001000000001b85c-4.dat	family_juko
behavioral2/memory/4376-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1096-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c522-13.dat	family_juko
behavioral2/memory/4544-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4544-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1096	WINWORD.exe
4544	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-1-5-21-189034102-168398478-1159367937-1000\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
5568	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	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	2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_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
5568	cmd.exe
5956	PING.EXE
2208	PING.EXE
2288	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2208	PING.EXE
2288	PING.EXE
5956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4376 wrote to memory of 1096	4376	2026-07-24_9dc4202ac71e5c13104c8cf4c56d2d2f_elex_wannacry.exe	89
PID 1096 wrote to memory of 5568	1096	WINWORD.exe	90
PID 5568 wrote to memory of 5956	5568	cmd.exe	92
PID 5568 wrote to memory of 2208	5568	cmd.exe	93
PID 5568 wrote to memory of 2288	5568	cmd.exe	94
PID 5568 wrote to memory of 4544	5568	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4376
- 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:1096
- - 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\00007B55" 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:5568
  - - 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:5956
  - - 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:2208
  - - 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:2288
  - - 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:4544

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

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Downloads

00007B55

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007B55
Size 37KB
SHA256 e896aab01201393c1b9f6ad203d77408e7c26d1dc8a94fa060f3b601221c7ed9
MD5 138c88ab3d6bb056ef2e1dd82180f09f
SHA1 a7c933803b8490601748bae4eeed94a4167c2969
SHA512 5d82fe638a8fc993ec52f3aeb1744fde5f70edff8aa4861efe6a23ea69bd72b912cb7b39394674d9496cd3f2f9a51da39d01c0763ff19dfff6e92c1394c124c2
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaV:3LsF2Kerc64sTiX2IV0Dhuogw2
TLSH
T191035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/1096-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4376-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4376-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4544-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4544-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads