juko | 3f15fb3b8d746acb7b3b3049123cab867809d6fa803a5bb77d14747cece3c6c3

General

Target
2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe
Size 47KB
Sample260511-syf2vadv4y
SHA256 3f15fb3b8d746acb7b3b3049123cab867809d6fa803a5bb77d14747cece3c6c3
MD5 7f8802dca81104ae28d40dbaa3485681
SHA1 c57db86980cdbf0d63ce5795bacfcabcbe40e96f
SHA512 9a168607f1e43dbe45ec3417323a9c9faf3e32ab093fa67ce0daa0a441dfa5cfe89c44711091f78776b2283528c153b70bcded46f9bc486f9e40ec516febca74
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJN:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxv
TLSH
T111235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x000a00000000d3db-5.dat	family_juko
behavioral2/files/0x001a00000002b30b-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3888	WINWORD.exe
4760	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	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	2026-05-11_7f8802dca81104ae28d40dbaa3485681_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

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
4676	cmd.exe
3844	PING.EXE
1488	PING.EXE
2444	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3844	PING.EXE
1488	PING.EXE
2444	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 3888	1080	2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe	77
PID 3888 wrote to memory of 4676	3888	WINWORD.exe	78
PID 4676 wrote to memory of 3844	4676	cmd.exe	80
PID 4676 wrote to memory of 1488	4676	cmd.exe	81
PID 4676 wrote to memory of 2444	4676	cmd.exe	82
PID 4676 wrote to memory of 4760	4676	cmd.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1080
- 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:3888
- - 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\0000461D" 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:4676
  - - 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:3844
  - - 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:1488
  - - 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:2444
  - - 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:4760

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

0000461D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000461D
Size 47KB
SHA256 25d0d15b1f185f6c051a6e09405d0e82cf04db227483c6c711cdd52ea1814399
MD5 d870491fa3a100b594fc32e019f68808
SHA1 7a62a2f48ccbf66240fb103ccbafae0bfaf93b95
SHA512 82d06fbf22173d718727ae68c89a2a0bf90270396d69a9bfbc5eb894c3e80134a0c0138b3416b57e275ae1e0d97fa220d50b1b7d9b1ca1292c844ddda21b7cae
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJW:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxg
TLSH
T113235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 3f15fb3b8d746acb7b3b3049123cab867809d6fa803a5bb77d14747cece3c6c3
MD5 7f8802dca81104ae28d40dbaa3485681
SHA1 c57db86980cdbf0d63ce5795bacfcabcbe40e96f
SHA512 9a168607f1e43dbe45ec3417323a9c9faf3e32ab093fa67ce0daa0a441dfa5cfe89c44711091f78776b2283528c153b70bcded46f9bc486f9e40ec516febca74
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJN:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxv
TLSH
T111235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1080-11-0x00000000009F0000-0x0000000000ACF000-memory.dmp

Download

memory/3888-13-0x0000000000980000-0x0000000000A5F000-memory.dmp

Download

memory/4760-16-0x00000000009A0000-0x0000000000A7F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads