juko | fe25fc5917bcac3e8dd94cedb9bdfbf9929b64e2e1444bcd5a2bdc8b54a29924

General

Target
2026-07-16_5a610d986aa9d973fed678bbfccbf5b1_elex_wannacry.exe
Size 49KB
Sample260716-k3fymsg19r
SHA256 fe25fc5917bcac3e8dd94cedb9bdfbf9929b64e2e1444bcd5a2bdc8b54a29924
MD5 5a610d986aa9d973fed678bbfccbf5b1
SHA1 4a4c06d2b87ea28f9f8ab82210f6d787fcc3b09a
SHA512 d59d82e868e89c6f0641b9b1251286213bcb71598122fb11721f1568bb43695042d1b586a96b444fb6f112ed3ada4c86310dd60b5069a02b6e96bccabebed061
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2o:VLy2Kerc64CiGImVucp4kojWh2o
TLSH
T1E6334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral2/memory/2728-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/2728-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2432-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c34d-13.dat	family_juko
behavioral2/memory/5596-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5596-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2432	WINWORD.exe
5596	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-1-5-21-3797332335-34111092-3597280141-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-16_5a610d986aa9d973fed678bbfccbf5b1_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
3784	cmd.exe
2408	PING.EXE
944	PING.EXE
1184	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1184	PING.EXE
2408	PING.EXE
944	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2728 wrote to memory of 2432	2728	2026-07-16_5a610d986aa9d973fed678bbfccbf5b1_elex_wannacry.exe	87
PID 2432 wrote to memory of 3784	2432	WINWORD.exe	88
PID 3784 wrote to memory of 2408	3784	cmd.exe	90
PID 3784 wrote to memory of 944	3784	cmd.exe	91
PID 3784 wrote to memory of 1184	3784	cmd.exe	92
PID 3784 wrote to memory of 5596	3784	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-16_5a610d986aa9d973fed678bbfccbf5b1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-16_5a610d986aa9d973fed678bbfccbf5b1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2728
- 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:2432
- - 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\0000761D" 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:3784
  - - 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:2408
  - - 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:944
  - - 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:1184
  - - 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:5596

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

0000761D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000761D
Size 49KB
SHA256 9f856c1b755828e8c75d1440ccf81b8eda842d1588c14fb5b63201e4023f0a1e
MD5 f3aa1c0706e8024e49249776f8e8be68
SHA1 4f4a676eb1c2a0db71cb85d1b32fde47731cac9d
SHA512 f9789025f4aaa4f3b15515446046b1876d03907c4ee2b3eea375666608a629e473cb29dc6378896c4ea5a63792e55b983c1883e4fd0dd8c17ac53f04c3af9b16
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2J:VLy2Kerc64CiGImVucp4kojWh2J
TLSH
T15F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 fe25fc5917bcac3e8dd94cedb9bdfbf9929b64e2e1444bcd5a2bdc8b54a29924
MD5 5a610d986aa9d973fed678bbfccbf5b1
SHA1 4a4c06d2b87ea28f9f8ab82210f6d787fcc3b09a
SHA512 d59d82e868e89c6f0641b9b1251286213bcb71598122fb11721f1568bb43695042d1b586a96b444fb6f112ed3ada4c86310dd60b5069a02b6e96bccabebed061
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2o:VLy2Kerc64CiGImVucp4kojWh2o
TLSH
T1E6334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2432-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2728-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2728-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5596-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5596-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads