juko | 31ea543bb9760b1fbd5b0f44c55afa99e5ed7a3ce0e0fb2c96398118491261c8

General

Target
2026-10-16_e45eca3b352b574f001f25c16f8513ef_elex_wannacry.exe
Size 88KB
Sample261017-e4b37ahy6z
SHA256 31ea543bb9760b1fbd5b0f44c55afa99e5ed7a3ce0e0fb2c96398118491261c8
MD5 e45eca3b352b574f001f25c16f8513ef
SHA1 0af2610efe4c8313435489f0ca7bda4f0a8542aa
SHA512 b80add62a190159c9b6ad42872a29bec464172a53211386fbaf1e28093548aba3550388c0f8b6ba86bd8bf1c669ba97d1c2c8899bbbf5f2c6bba2f8aaad64a47
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrg:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193o
TLSH
T104934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000600000000053e-3.dat	family_juko
behavioral2/files/0x0004000000000433-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4424	WINWORD.exe
4120	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-1-5-21-4154726816-2055034831-2297277433-1000\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
2632	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-16_e45eca3b352b574f001f25c16f8513ef_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
2632	cmd.exe
5100	PING.EXE
2312	PING.EXE
684	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5100	PING.EXE
2312	PING.EXE
684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3084 wrote to memory of 4424	3084	2026-10-16_e45eca3b352b574f001f25c16f8513ef_elex_wannacry.exe	89
PID 4424 wrote to memory of 2632	4424	WINWORD.exe	90
PID 2632 wrote to memory of 5100	2632	cmd.exe	92
PID 2632 wrote to memory of 2312	2632	cmd.exe	93
PID 2632 wrote to memory of 684	2632	cmd.exe	94
PID 2632 wrote to memory of 4120	2632	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-16_e45eca3b352b574f001f25c16f8513ef_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-16_e45eca3b352b574f001f25c16f8513ef_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3084
- 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:4424
- - 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\000022FE" 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:2632
  - - 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:5100
  - - 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:2312
  - - 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:684
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4120

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

000022FE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000022FE
Size 88KB
SHA256 e5b9551b40d9f3ebafa97c8d533bb3b0398faf7ed310f31c02191645ce6e543e
MD5 10464323cd95fa0acca66dd45eee365c
SHA1 0f0eef814cecaedc4762b55e6f6b36509925010c
SHA512 377a3c72c80730cf21585d06a67e66d107569cb2fb6b8cb0908b90f242a9eece75f218223f2825edffa741d636c67e16242f2721995414f673457f9615afff09
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrL:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193T
TLSH
T1FA934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 31ea543bb9760b1fbd5b0f44c55afa99e5ed7a3ce0e0fb2c96398118491261c8
MD5 e45eca3b352b574f001f25c16f8513ef
SHA1 0af2610efe4c8313435489f0ca7bda4f0a8542aa
SHA512 b80add62a190159c9b6ad42872a29bec464172a53211386fbaf1e28093548aba3550388c0f8b6ba86bd8bf1c669ba97d1c2c8899bbbf5f2c6bba2f8aaad64a47
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrg:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193o
TLSH
T104934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads