juko | 3421845ba1afbfa91c810e0c9915b2338a00da9b58dbe70640503a1ba919173e

General

Target
2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe
Size 32KB
Sample260504-v3wdfacy2p
SHA256 3421845ba1afbfa91c810e0c9915b2338a00da9b58dbe70640503a1ba919173e
MD5 4a85a2cb1fdaca55cb994f34fb7d9261
SHA1 f01f6b36d7b7b8ccc70291809033da70c53729a7
SHA512 4dc491eaf49ad3083bfc42d96e489876847a275afbbb20b8f2ce3ad85deb71ce37ffe14c58ef2a5cb95f14c46704e0a0dd0ae985ba44a0b748fe95c86815c78f
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfv:tLsF2Kerc64sTiX2IV0DYQH
TLSH
T1B1E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000e00000002a8cf-4.dat	family_juko
behavioral2/files/0x001500000002b43d-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4888	WINWORD.exe
5220	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-1-5-21-2397528088-2630719772-1129911217-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_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

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
5632	cmd.exe
2492	PING.EXE
4820	PING.EXE
1204	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2492	PING.EXE
4820	PING.EXE
1204	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1104 wrote to memory of 4888	1104	2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe	79
PID 4888 wrote to memory of 5632	4888	WINWORD.exe	80
PID 5632 wrote to memory of 2492	5632	cmd.exe	82
PID 5632 wrote to memory of 4820	5632	cmd.exe	83
PID 5632 wrote to memory of 1204	5632	cmd.exe	84
PID 5632 wrote to memory of 5220	5632	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1104
- 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:4888
- - 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\00001387" 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:5632
  - - 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:2492
  - - 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:4820
  - - 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:1204
  - - 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:5220

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

00001387

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001387
Size 32KB
SHA256 15a5b43ed9dfe9bae840e8807a229a8dfa8f66c42cb34c457fcb2e2baa47e2e6
MD5 084823b3e88f882020f408e87d0ef215
SHA1 6246a1f191e7982993b41600e989f213d38ae985
SHA512 00dfb6f528913d638dc83b43624e58fe8143e66366e7161b96dd1fd2791b0bfdf6fde4a343ff9af324bbe5f95780ec1d5bcc7390519e8bb5ca396b3f7e6b8ee6
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbf6:tLsF2Kerc64sTiX2IV0DYQy
TLSH
T1B8E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 3421845ba1afbfa91c810e0c9915b2338a00da9b58dbe70640503a1ba919173e
MD5 4a85a2cb1fdaca55cb994f34fb7d9261
SHA1 f01f6b36d7b7b8ccc70291809033da70c53729a7
SHA512 4dc491eaf49ad3083bfc42d96e489876847a275afbbb20b8f2ce3ad85deb71ce37ffe14c58ef2a5cb95f14c46704e0a0dd0ae985ba44a0b748fe95c86815c78f
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfv:tLsF2Kerc64sTiX2IV0DYQH
TLSH
T1B1E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1104-10-0x0000000000850000-0x000000000089A000-memory.dmp

Download

memory/4888-13-0x0000000000840000-0x000000000088A000-memory.dmp

Download

memory/5220-16-0x0000000000970000-0x00000000009BA000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads