juko | de766d05c72d117dd7dc11cf6ff1e9456f0d1145a9ad58bdbbe82458e0bde947

General

Target
2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe
Size 30KB
Sample260419-e9yjdacv9m
SHA256 de766d05c72d117dd7dc11cf6ff1e9456f0d1145a9ad58bdbbe82458e0bde947
MD5 6bb813d0e0d261522d259c85c38602b0
SHA1 dc005b926455abf4a7c0e0bae3b530f59ff26ada
SHA512 845959eac7afd4fcbeb5021a887839ab9747409e5d14a403c3328b685409b99c00c7101b011d811a96bb48e99c3077fd285e37d484cbbc0dc4dead1efc0635a0
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrp:OLsF2Kerc64sTiX2IV0DkFMp
TLSH
T13BE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
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/0x000a000000021698-4.dat	family_juko
behavioral1/files/0x000900000002449e-11.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-1-5-21-1609746302-1884177235-1125644204-1000\Control Panel\International\Geo\Nation	2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1609746302-1884177235-1125644204-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4648	WINWORD.exe
4936	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-1-5-21-1609746302-1884177235-1125644204-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-19_6bb813d0e0d261522d259c85c38602b0_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
2640	cmd.exe
4872	PING.EXE
5104	PING.EXE
4848	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4848	PING.EXE
4872	PING.EXE
5104	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4748 wrote to memory of 4648	4748	2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe	84
PID 4648 wrote to memory of 2640	4648	WINWORD.exe	85
PID 2640 wrote to memory of 4872	2640	cmd.exe	87
PID 2640 wrote to memory of 5104	2640	cmd.exe	88
PID 2640 wrote to memory of 4848	2640	cmd.exe	89
PID 2640 wrote to memory of 4936	2640	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4748
- 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:4648
- - 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\00007A38" 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: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:4872
  - - 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:5104
  - - 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:4848
  - - 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:4936

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

00007A38

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A38
Size 30KB
SHA256 441c9014baec910da7256fed84bbec99ebbcadb1fe5eeffb0d3b17939df08b3d
MD5 e3eaf443a0015bb40e5f1d35e9b53bb6
SHA1 f1b94b90a71309bfefdf88c3635dd6f315aeccea
SHA512 a756fbe227c74906801a86b8ce4c9db8f8b7ffa24421e39f4c3901f7a5cdad6e52064d39257a57b68f9fa63fe663daa91470ae608fd0f5623c475ffccaa1ad22
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrk:OLsF2Kerc64sTiX2IV0DkFMk
TLSH
T134E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 de766d05c72d117dd7dc11cf6ff1e9456f0d1145a9ad58bdbbe82458e0bde947
MD5 6bb813d0e0d261522d259c85c38602b0
SHA1 dc005b926455abf4a7c0e0bae3b530f59ff26ada
SHA512 845959eac7afd4fcbeb5021a887839ab9747409e5d14a403c3328b685409b99c00c7101b011d811a96bb48e99c3077fd285e37d484cbbc0dc4dead1efc0635a0
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrp:OLsF2Kerc64sTiX2IV0DkFMp
TLSH
T13BE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4648-10-0x00000000005D0000-0x000000000064E000-memory.dmp

Download

memory/4748-8-0x0000000002410000-0x000000000248E000-memory.dmp

Download

memory/4936-13-0x00000000028F0000-0x000000000296E000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads