juko | 0c89677ed09b04868d171a177fe0f1afbf5884dc8ae42a4caf8302df8c487f41

General

Target
2026-08-03_937a3ffc811077fd0edfc41858a46ae3_elex_wannacry.exe
Size 137KB
Sample260804-mvhtdatxax
SHA256 0c89677ed09b04868d171a177fe0f1afbf5884dc8ae42a4caf8302df8c487f41
MD5 937a3ffc811077fd0edfc41858a46ae3
SHA1 1b3a0540c56f9427e4961b171533f3ea33ab4202
SHA512 08d7d7a13be30f369e28bfceb44dec989380db8ddd3a1ffc8b7ac6aff267e797708f4791d7cd07923d853f4ab6289429d15f4ed8d1c62300b75a46c46b01d4ce
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgy:+Ly2Kwc64YIcYjIDLCSiDaQZ
TLSH
T1A1D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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 8 IoCs

resource	yara_rule
behavioral1/memory/4464-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x001b0000000242f7-5.dat	family_juko
behavioral1/memory/4464-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/376-11-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/376-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x000900000002436d-16.dat	family_juko
behavioral1/memory/1788-18-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/1788-19-0x0000000000400000-0x0000000000436000-memory.dmp	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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-08-03_937a3ffc811077fd0edfc41858a46ae3_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
376	WINWORD.exe
1788	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-1-5-21-876885714-46325919-1482798410-1000\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
4544	cmd.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	2026-08-03_937a3ffc811077fd0edfc41858a46ae3_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
3596	PING.EXE
4216	PING.EXE
2020	PING.EXE
4544	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3596	PING.EXE
4216	PING.EXE
2020	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4464 wrote to memory of 376	4464	2026-08-03_937a3ffc811077fd0edfc41858a46ae3_elex_wannacry.exe	86
PID 376 wrote to memory of 4544	376	WINWORD.exe	87
PID 4544 wrote to memory of 3596	4544	cmd.exe	89
PID 4544 wrote to memory of 4216	4544	cmd.exe	90
PID 4544 wrote to memory of 2020	4544	cmd.exe	91
PID 4544 wrote to memory of 1788	4544	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-03_937a3ffc811077fd0edfc41858a46ae3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_937a3ffc811077fd0edfc41858a46ae3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4464
- 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:376
- - 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\00002795" 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:4544
  - - 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:3596
  - - 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:4216
  - - 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:2020
  - - 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:1788

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

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

00002795

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002795
Size 137KB
SHA256 15288b0af208fdaf04f26b08fbd0b06750c66905fe8327d0095f68505e4d4292
MD5 4374102d0631b11b0598551fca663789
SHA1 4f3990fc4d331c831498f51377485edce769358d
SHA512 18b223845ed9b8d34d3b7ba5db33b73b7528d417355c3c0d2216d73232c516ebdfbd6f98e09f05838ccc9d7a942d3392b7659d2bd1c88427c30dc4223f0c89f3
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg0:+Ly2Kwc64YIcYjIDLCSiDaQ7
TLSH
T162D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 137KB
SHA256 0c89677ed09b04868d171a177fe0f1afbf5884dc8ae42a4caf8302df8c487f41
MD5 937a3ffc811077fd0edfc41858a46ae3
SHA1 1b3a0540c56f9427e4961b171533f3ea33ab4202
SHA512 08d7d7a13be30f369e28bfceb44dec989380db8ddd3a1ffc8b7ac6aff267e797708f4791d7cd07923d853f4ab6289429d15f4ed8d1c62300b75a46c46b01d4ce
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgy:+Ly2Kwc64YIcYjIDLCSiDaQZ
TLSH
T1A1D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/376-11-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/376-15-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1788-18-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1788-19-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4464-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4464-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads