juko | 409c9f0910963b9234331bfb26b1f66b89c7b7ce252353a9e5de86f2b8c476bd

General

Target
2026-07-11_449f4df36a7f02c0eeba9bcb8761b54d_elex_wannacry.exe
Size 49KB
Sample260711-qtkhcsby6m
SHA256 409c9f0910963b9234331bfb26b1f66b89c7b7ce252353a9e5de86f2b8c476bd
MD5 449f4df36a7f02c0eeba9bcb8761b54d
SHA1 adf99f3cc6642549d9a1e94d0cc5196bb9b4aef1
SHA512 7269d68f25067c18c03928d349bd75022f4c3e78edae4ab94d5e8e9ea6bf830843c070cd158f8f72502dc2b0680262abf8b0f8a5511867db0920d5406be6bdea
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T122334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral2/memory/2712-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/2712-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3320-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0005000000016cbe-13.dat	family_juko
behavioral2/memory/4552-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4552-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3320	WINWORD.exe
4552	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-1-5-21-1738198120-2966725515-3980530802-1000\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	2026-07-11_449f4df36a7f02c0eeba9bcb8761b54d_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
3504	cmd.exe
5708	PING.EXE
2404	PING.EXE
2424	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5708	PING.EXE
2404	PING.EXE
2424	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2712 wrote to memory of 3320	2712	2026-07-11_449f4df36a7f02c0eeba9bcb8761b54d_elex_wannacry.exe	87
PID 3320 wrote to memory of 3504	3320	WINWORD.exe	88
PID 3504 wrote to memory of 5708	3504	cmd.exe	90
PID 3504 wrote to memory of 2404	3504	cmd.exe	91
PID 3504 wrote to memory of 2424	3504	cmd.exe	92
PID 3504 wrote to memory of 4552	3504	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-11_449f4df36a7f02c0eeba9bcb8761b54d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-11_449f4df36a7f02c0eeba9bcb8761b54d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2712
- 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:3320
- - 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\000000E9" 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:3504
  - - 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:5708
  - - 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:2404
  - - 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:2424
  - - 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:4552

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

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

000000E9

Path C:\Users\Admin\AppData\Roaming\Mozilla\000000E9
Size 49KB
SHA256 8622b54b1e041efd6f70a56130e4849b4ad40adfd1d42ce0b8700e25fc18dc3c
MD5 3dcf53a637ce23b3b8e6e7fa37879a91
SHA1 9a2788d283c36b00991f3b942738c2b7a5558b4b
SHA512 be3b01b64bd6e439184248fd80d5216abe52492a82c3c10e6727e8843344605c07b7e28003295b853ce442e0f98daf9bfbec89ca1cf086a3daed4b7db4911f3e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h20:VLy2Kerc64CiGImVucp4kojWh20
TLSH
T13E334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 409c9f0910963b9234331bfb26b1f66b89c7b7ce252353a9e5de86f2b8c476bd
MD5 449f4df36a7f02c0eeba9bcb8761b54d
SHA1 adf99f3cc6642549d9a1e94d0cc5196bb9b4aef1
SHA512 7269d68f25067c18c03928d349bd75022f4c3e78edae4ab94d5e8e9ea6bf830843c070cd158f8f72502dc2b0680262abf8b0f8a5511867db0920d5406be6bdea
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T122334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2712-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2712-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3320-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4552-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4552-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads