juko | d6d554d6c27fca07ed7712fd3f522dce03c2c98a7a07ef07273b37135c32bc8e

General

Target
2026-06-04_658ed754dad14d447ae9f8d039ec2247_elex_wannacry.exe
Size 53KB
Sample260604-c8bbcaas8r
SHA256 d6d554d6c27fca07ed7712fd3f522dce03c2c98a7a07ef07273b37135c32bc8e
MD5 658ed754dad14d447ae9f8d039ec2247
SHA1 47d8b34b58d8f58851f16aeeed583f9793c8538e
SHA512 d121fa85084c486d5daeca105c3b1e6a47f14b8a7167c75adacf02f87ecea40e45c5a79853130b288b573be2d63d5771a4f8ab65ca5344f74addf6cbe9feec51
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2g:3Ly2Kerc64CiGIm1tcBMUOOFg
TLSH
T12C335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x0012000000025aaf-4.dat	family_juko
behavioral2/files/0x001c00000002b3c2-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4868	WINWORD.exe
1688	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-1-5-21-2409539145-3342400454-2096821238-1000\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	2026-06-04_658ed754dad14d447ae9f8d039ec2247_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
3920	cmd.exe
2904	PING.EXE
4724	PING.EXE
4060	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2904	PING.EXE
4724	PING.EXE
4060	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5192 wrote to memory of 4868	5192	2026-06-04_658ed754dad14d447ae9f8d039ec2247_elex_wannacry.exe	80
PID 4868 wrote to memory of 3920	4868	WINWORD.exe	81
PID 3920 wrote to memory of 2904	3920	cmd.exe	83
PID 3920 wrote to memory of 4724	3920	cmd.exe	84
PID 3920 wrote to memory of 4060	3920	cmd.exe	85
PID 3920 wrote to memory of 1688	3920	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-04_658ed754dad14d447ae9f8d039ec2247_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-04_658ed754dad14d447ae9f8d039ec2247_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5192
- 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:4868
- - 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\00003F57" 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:3920
  - - 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:2904
  - - 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:4724
  - - 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:4060
  - - 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:1688

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

00003F57

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003F57
Size 53KB
SHA256 29e95e4a0cd2c251804c3fd91733862f8e030a63a6b28f204b91e2b8cfb9358b
MD5 399f435bcc3e35ce72725c743cc4cd1f
SHA1 c99fa4359d7a8612e7e812d3935dcd83de55a573
SHA512 7feed03f1b0dff14d1ecd978abda56951324b9b0b8e41fe2028b315daa6cdf74c636286db8fc1d3f4f6af999e7b0843ea7749d03cf327aca8b5f31397c387a8d
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq26:3Ly2Kerc64CiGIm1tcBMUOOF6
TLSH
T169335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 d6d554d6c27fca07ed7712fd3f522dce03c2c98a7a07ef07273b37135c32bc8e
MD5 658ed754dad14d447ae9f8d039ec2247
SHA1 47d8b34b58d8f58851f16aeeed583f9793c8538e
SHA512 d121fa85084c486d5daeca105c3b1e6a47f14b8a7167c75adacf02f87ecea40e45c5a79853130b288b573be2d63d5771a4f8ab65ca5344f74addf6cbe9feec51
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2g:3Ly2Kerc64CiGIm1tcBMUOOFg
TLSH
T12C335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads