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 7 IoCs

resource	yara_rule
behavioral2/memory/1420-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x001000000001b664-5.dat	family_juko
behavioral2/memory/1420-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/5036-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c508-13.dat	family_juko
behavioral2/memory/4516-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4516-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5036	WINWORD.exe
4516	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-1-5-21-2246396966-3025826688-3847171515-1000\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
5132	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	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	2026-08-03_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

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
996	PING.EXE
3224	PING.EXE
5132	cmd.exe
2836	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2836	PING.EXE
996	PING.EXE
3224	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1420 wrote to memory of 5036	1420	2026-08-03_937a3ffc811077fd0edfc41858a46ae3_elex_wannacry.exe	89
PID 5036 wrote to memory of 5132	5036	WINWORD.exe	90
PID 5132 wrote to memory of 2836	5132	cmd.exe	92
PID 5132 wrote to memory of 996	5132	cmd.exe	93
PID 5132 wrote to memory of 3224	5132	cmd.exe	94
PID 5132 wrote to memory of 4516	5132	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1420
- 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:5036
- - 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\00002663" 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:5132
  - - 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:2836
  - - 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:996
  - - 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:3224
  - - 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:4516

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002663

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002663
Size 137KB
SHA256 b24e71e323597f5694eb0cec324f38727e59bd9ec1e67224ffe84f720f13a22b
MD5 2a48df63218aa4961cdbeb4cc224f7f9
SHA1 30a2d0c817961199571b88d5f85787784a107c01
SHA512 aeca1951d889c3d73ea06e4436ddd7eaa4fe9678cccd03b83d8143b2c6f7bbb04f23a0d70db7428b6441b75b67091fec0c6d762c85e939388d062a0ddd0532e2
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGgp:+Ly2Kwc64YIcYjIDLCSiDaQy
TLSH
T1B4D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/1420-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1420-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4516-15-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4516-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5036-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads