juko | f4936f7b0f656a155be8819998b0ab083e0d894bffc78fdc1e923c7750685db7

General

Target
2026-07-24_3b9de3c0704722f48588f63453259af7_elex_wannacry.exe
Size 49KB
Sample260724-md7feacl3y
SHA256 f4936f7b0f656a155be8819998b0ab083e0d894bffc78fdc1e923c7750685db7
MD5 3b9de3c0704722f48588f63453259af7
SHA1 0adc8d6aaa9fe04017f17b1c9a398d793421b1bd
SHA512 0e2a0b8b86c86994c7574f90e4aaadba617aaa8bb9ed17c539018de20cb448e70923a54563dfd6fc5c0b11864156c1a610ff9bdaaebb8a5fa55ae780204e1a05
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T1EF334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/1740-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000800000001b888-5.dat	family_juko
behavioral2/memory/1740-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3424-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c52b-13.dat	family_juko
behavioral2/memory/816-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/816-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3424	WINWORD.exe
816	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-1-5-21-552508041-2681165170-3229858294-1000\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
5860	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-24_3b9de3c0704722f48588f63453259af7_elex_wannacry.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
5860	cmd.exe
5704	PING.EXE
1328	PING.EXE
1712	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5704	PING.EXE
1328	PING.EXE
1712	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1740 wrote to memory of 3424	1740	2026-07-24_3b9de3c0704722f48588f63453259af7_elex_wannacry.exe	89
PID 3424 wrote to memory of 5860	3424	WINWORD.exe	90
PID 5860 wrote to memory of 5704	5860	cmd.exe	92
PID 5860 wrote to memory of 1328	5860	cmd.exe	93
PID 5860 wrote to memory of 1712	5860	cmd.exe	94
PID 5860 wrote to memory of 816	5860	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-24_3b9de3c0704722f48588f63453259af7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-24_3b9de3c0704722f48588f63453259af7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1740
- 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:3424
- - 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\00004683" 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:5860
  - - 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:5704
  - - 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:1328
  - - 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:1712
  - - 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:816

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

00004683

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004683
Size 49KB
SHA256 4dded1997d88d11d870757ed0ff17184cf82cfb0dd8fcbd67f1c086a5f30cd25
MD5 7b9818cf69424b37a63fa04284132d4d
SHA1 5b14f114f942e6a105ce9aa6b8a9a0f1f8d71035
SHA512 e01667a50a9619001ac125dcaf9ba05724e728bee535a8611072cb09fef0cf3a78f5e440f358790764cd1ad9b1713cf507ea97b9a73ee60cae5565a5feb8868c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2M:VLy2Kerc64CiGImVucp4kojWh2M
TLSH
T1D1334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 f4936f7b0f656a155be8819998b0ab083e0d894bffc78fdc1e923c7750685db7
MD5 3b9de3c0704722f48588f63453259af7
SHA1 0adc8d6aaa9fe04017f17b1c9a398d793421b1bd
SHA512 0e2a0b8b86c86994c7574f90e4aaadba617aaa8bb9ed17c539018de20cb448e70923a54563dfd6fc5c0b11864156c1a610ff9bdaaebb8a5fa55ae780204e1a05
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T1EF334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/816-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/816-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1740-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1740-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3424-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads