juko | 564fd0bafca48eb112dc49ef7d878216a63ca7be55776f91ff22b477ea9990f5

General

Target
2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe
Size 30KB
Sample260505-jfl1psev8l
SHA256 564fd0bafca48eb112dc49ef7d878216a63ca7be55776f91ff22b477ea9990f5
MD5 42d56119157c2ccf8453a89e30b48383
SHA1 f9a31221c54a738ccbf4ea9e864fa863906aaba5
SHA512 d0aada727b209477c56dd50ddac32ef8e511459ac0bf36bf6f62c09054d701fbeec828968a97fc62786ca9e3052bc56aa28b74ea86879730d7d2a8b3173ef788
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrl:OLsF2Kerc64sTiX2IV0DkFMl
TLSH
T1F8E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
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
behavioral2/files/0x002b00000002b0c9-4.dat	family_juko
behavioral2/files/0x001700000002b38a-11.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2836	WINWORD.exe
4308	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-1-5-21-3119821332-640943685-2562343641-1000\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	2026-05-05_42d56119157c2ccf8453a89e30b48383_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
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
236	cmd.exe
2972	PING.EXE
4792	PING.EXE
5084	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2972	PING.EXE
4792	PING.EXE
5084	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2060 wrote to memory of 2836	2060	2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe	79
PID 2836 wrote to memory of 236	2836	WINWORD.exe	80
PID 236 wrote to memory of 2972	236	cmd.exe	82
PID 236 wrote to memory of 4792	236	cmd.exe	83
PID 236 wrote to memory of 5084	236	cmd.exe	84
PID 236 wrote to memory of 4308	236	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2060
- 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:2836
- - 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\000040DC" 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:236
  - - 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:2972
  - - 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:4792
  - - 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:5084
  - - 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:4308

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

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

000040DC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040DC
Size 30KB
SHA256 d02eadc13681d1d514b94674c916b62eb602832ee18140250251869df96e696b
MD5 4034de99a4995222c4933e2873fbcabd
SHA1 2c5d7f686a07c2eb60e6afca3ff87e76b87205d0
SHA512 1b243a20dee668e3b0df2025418cdbe2f23d8ca65a31dae57cc5853b62a16189f202d5d6d350df3ecad8d6ab590d7010449a4b678bad7faef14d3fa2a877f91b
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrF:OLsF2Kerc64sTiX2IV0DkFMF
TLSH
T113E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 564fd0bafca48eb112dc49ef7d878216a63ca7be55776f91ff22b477ea9990f5
MD5 42d56119157c2ccf8453a89e30b48383
SHA1 f9a31221c54a738ccbf4ea9e864fa863906aaba5
SHA512 d0aada727b209477c56dd50ddac32ef8e511459ac0bf36bf6f62c09054d701fbeec828968a97fc62786ca9e3052bc56aa28b74ea86879730d7d2a8b3173ef788
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrl:OLsF2Kerc64sTiX2IV0DkFMl
TLSH
T1F8E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2060-8-0x0000000002160000-0x00000000021E2000-memory.dmp

Download

memory/2836-10-0x0000000002140000-0x00000000021C2000-memory.dmp

Download

memory/4308-14-0x00000000026E0000-0x00000000026E7000-memory.dmp

Download

memory/4308-13-0x0000000002A00000-0x0000000002A82000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads