juko | 392dc225a64114ca9cccc1a2d77404ce3d81432639dcb9c7774ef436c6d52462

General

Target
2026-06-03_18a94a83dc9413301b2ed0bf8412de59_elex_wannacry.exe
Size 32KB
Sample260603-lw4a2ab151
SHA256 392dc225a64114ca9cccc1a2d77404ce3d81432639dcb9c7774ef436c6d52462
MD5 18a94a83dc9413301b2ed0bf8412de59
SHA1 79ab3f9fb4c9116fe8b933e67ff8d9263c751940
SHA512 a489aefd47d146e81f8c0f784c6211a571235fe3fd9bc9fd52cd5a6e1943ee1f7effc4af1ad6d7503f9c4d5fb4948ce5c354d24116436ea80d79d194e2dbf080
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpF:OLsF2Kerc64sTiX2IV0DhuF
TLSH
T1AFE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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/0x00140000000270df-4.dat	family_juko
behavioral2/files/0x001a00000002b474-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2768	WINWORD.exe
1724	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-1-5-21-2654269261-3199571979-4291878722-1000\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	2026-06-03_18a94a83dc9413301b2ed0bf8412de59_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
844	cmd.exe
3504	PING.EXE
3772	PING.EXE
3264	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3264	PING.EXE
3504	PING.EXE
3772	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2996 wrote to memory of 2768	2996	2026-06-03_18a94a83dc9413301b2ed0bf8412de59_elex_wannacry.exe	81
PID 2768 wrote to memory of 844	2768	WINWORD.exe	82
PID 844 wrote to memory of 3504	844	cmd.exe	84
PID 844 wrote to memory of 3772	844	cmd.exe	85
PID 844 wrote to memory of 3264	844	cmd.exe	86
PID 844 wrote to memory of 1724	844	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-06-03_18a94a83dc9413301b2ed0bf8412de59_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_18a94a83dc9413301b2ed0bf8412de59_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2996
- 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:2768
- - 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\0000286B" 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:844
  - - 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: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:3772
  - - 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:3264
  - - 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:1724

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

0000286B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000286B
Size 32KB
SHA256 242f439b02dbf9217b16b7739cd77096a928c7f71cea591d715afe1be0e2872d
MD5 5866bf631390139bc16b846f9f8405b0
SHA1 0d519f02637412858ac8110749a53afb747ae978
SHA512 6dab6c8a094e38d864b3352db2da7000927ddb5004fef24829fffc7000976e7af3f4950e55a70c1a5f77403cae104691063f1a0648d1ce4ed6b104de3bdbb6ef
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpE:OLsF2Kerc64sTiX2IV0DhuE
TLSH
T1AEE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 392dc225a64114ca9cccc1a2d77404ce3d81432639dcb9c7774ef436c6d52462
MD5 18a94a83dc9413301b2ed0bf8412de59
SHA1 79ab3f9fb4c9116fe8b933e67ff8d9263c751940
SHA512 a489aefd47d146e81f8c0f784c6211a571235fe3fd9bc9fd52cd5a6e1943ee1f7effc4af1ad6d7503f9c4d5fb4948ce5c354d24116436ea80d79d194e2dbf080
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpF:OLsF2Kerc64sTiX2IV0DhuF
TLSH
T1AFE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads