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
behavioral1/files/0x000b0000000004e9-4.dat	family_juko
behavioral1/files/0x000500000001e3f6-12.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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-06-04_658ed754dad14d447ae9f8d039ec2247_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1860	WINWORD.exe
1356	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-1-5-21-204488895-2999877624-296153668-1000\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	2026-06-04_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

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
3280	PING.EXE
2428	PING.EXE
1424	cmd.exe
2252	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2428	PING.EXE
2252	PING.EXE
3280	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2612 wrote to memory of 1860	2612	2026-06-04_658ed754dad14d447ae9f8d039ec2247_elex_wannacry.exe	90
PID 1860 wrote to memory of 1424	1860	WINWORD.exe	92
PID 1424 wrote to memory of 2252	1424	cmd.exe	94
PID 1424 wrote to memory of 3280	1424	cmd.exe	96
PID 1424 wrote to memory of 2428	1424	cmd.exe	97
PID 1424 wrote to memory of 1356	1424	cmd.exe	100

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2612
- 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:1860
- - 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\00003DF3" 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:1424
  - - 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:2252
  - - 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:3280
  - - 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:2428
  - - 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:1356

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

00003DF3

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003DF3
Size 53KB
SHA256 cb1f3670077fa510c7e74514c6b1acd5ef55aee33d3a28796fa2d547488d23fc
MD5 cb8fdedd513a3906d05390715d4700a3
SHA1 efdcdc8f243d27db6fdad2e1b107ec6c5a98143b
SHA512 9badfc2b72e1abbef05e136ceedab5a64a36ccfe89fb1e93ad04153f674521bd42f4b2427cd5b717432889ffa9bc7ffd711dabb340dcb6463281417dff2ece92
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2/:3Ly2Kerc64CiGIm1tcBMUOOF/
TLSH
T19A335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

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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