juko | 7b265c27df7d00a9041784d36783eea22ecd2e9c61ffb013b7dc060a0249f08a

General

Target
2026-07-20_4f2c3669a5e1ed23a1cd2bcb7e637d84_elex_wannacry.exe
Size 49KB
Sample260720-ny8pmsbs9s
SHA256 7b265c27df7d00a9041784d36783eea22ecd2e9c61ffb013b7dc060a0249f08a
MD5 4f2c3669a5e1ed23a1cd2bcb7e637d84
SHA1 521286c02cfb1ed5fbbc4eebe1a3a08b6bf3729c
SHA512 d39a66ec3588e07915c8b8932acbca3ae35c60d2ccc467c63ede629c376c410ff7a6be292d55c650fcea44adaf3a201f202be1f6e67a165245ee372e2ca03fd3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2I:VLy2Kerc64CiGImVucp4kojWh2I
TLSH
T13A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/3424-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000900000000082a-5.dat	family_juko
behavioral2/memory/3424-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2440-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c544-13.dat	family_juko
behavioral2/memory/1568-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1568-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2440	WINWORD.exe
1568	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-1-5-21-2301830172-776172150-2531349243-1000\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
868	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	2026-07-20_4f2c3669a5e1ed23a1cd2bcb7e637d84_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
4996	PING.EXE
2376	PING.EXE
868	cmd.exe
4280	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4280	PING.EXE
4996	PING.EXE
2376	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3424 wrote to memory of 2440	3424	2026-07-20_4f2c3669a5e1ed23a1cd2bcb7e637d84_elex_wannacry.exe	89
PID 2440 wrote to memory of 868	2440	WINWORD.exe	90
PID 868 wrote to memory of 4280	868	cmd.exe	92
PID 868 wrote to memory of 4996	868	cmd.exe	93
PID 868 wrote to memory of 2376	868	cmd.exe	94
PID 868 wrote to memory of 1568	868	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_4f2c3669a5e1ed23a1cd2bcb7e637d84_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_4f2c3669a5e1ed23a1cd2bcb7e637d84_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3424
- 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:2440
- - 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\00001A4D" 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:868
  - - 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:4280
  - - 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:4996
  - - 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:2376
  - - 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:1568

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

00001A4D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A4D
Size 49KB
SHA256 1b33fa6bcd3552d94b0dab3885909f5da93b696f9666d153fbdb3836bbc5ba1f
MD5 84881e1a7ef7913f52012dcf26728e0b
SHA1 e2a8114737aa97d17032f4de48a8abd5e83251ec
SHA512 ea15289c71a73b2fa0de038493c3f44f263694e0d1b3db3881a83d089ee887581c64ec47dfdf2d747deebb466ac2e0430d971047cd161e23a580ddeb7ab3b5ba
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2a:VLy2Kerc64CiGImVucp4kojWh2a
TLSH
T1EF334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 7b265c27df7d00a9041784d36783eea22ecd2e9c61ffb013b7dc060a0249f08a
MD5 4f2c3669a5e1ed23a1cd2bcb7e637d84
SHA1 521286c02cfb1ed5fbbc4eebe1a3a08b6bf3729c
SHA512 d39a66ec3588e07915c8b8932acbca3ae35c60d2ccc467c63ede629c376c410ff7a6be292d55c650fcea44adaf3a201f202be1f6e67a165245ee372e2ca03fd3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2I:VLy2Kerc64CiGImVucp4kojWh2I
TLSH
T13A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1568-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1568-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2440-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

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

Download

memory/3424-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads