juko | 4544eb4f7b8a72fc8ecffd1517d31c316c93de7d0a2747c8b954461571f53ffc

General

Target
2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.exe
Size 49KB
Sample260517-jf54kshv6n
SHA256 4544eb4f7b8a72fc8ecffd1517d31c316c93de7d0a2747c8b954461571f53ffc
MD5 72f58d2d86e4ffddc80a2412be7394a5
SHA1 5adb42cedae8743378db041c3a55deb2127408c0
SHA512 3b5b72028830f9f8c7d5b6dbb015788725e92aa60b59caa9a69fdc1136b2739c81a6e4d526513a3b611ceec22252430b1aafa8b4b7da75d6de7e00c42c5b33f2
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2i:4Ly2Kerc64CiGImVu8p4kojWh2i
TLSH
T188334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral2/memory/3936-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000900000002acc8-5.dat	family_juko
behavioral2/memory/1500-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3936-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1500-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b48d-16.dat	family_juko
behavioral2/memory/4280-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4280-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1500	WINWORD.exe
4280	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-1-5-21-125073035-2952146151-721812867-1000\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	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	2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.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
3532	cmd.exe
3096	PING.EXE
2856	PING.EXE
2704	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2704	PING.EXE
3096	PING.EXE
2856	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3936 wrote to memory of 1500	3936	2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.exe	80
PID 1500 wrote to memory of 3532	1500	WINWORD.exe	81
PID 3532 wrote to memory of 3096	3532	cmd.exe	83
PID 3532 wrote to memory of 2856	3532	cmd.exe	84
PID 3532 wrote to memory of 2704	3532	cmd.exe	85
PID 3532 wrote to memory of 4280	3532	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3936
- 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:1500
- - 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\00004DB1" 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:3532
  - - 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:3096
  - - 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:2856
  - - 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:2704
  - - 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:4280

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

00004DB1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004DB1
Size 49KB
SHA256 4a6dfb40213e6c1b1d6c9f09e0b8bb68a49827169c1463ede981c4b09936319c
MD5 4113f4390743a69d578b65798a357b6e
SHA1 440109c54604f9f6efa07de60f9a36e307654146
SHA512 186983f49d89a6deec7131282bbf28b21e4d125c6b92567af4cb1d6a85009febd560ed08043a7449fa142780385a3be90369895d95e687f63c2b92d3bee568f0
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2o:4Ly2Kerc64CiGImVu8p4kojWh2o
TLSH
T1EB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 4544eb4f7b8a72fc8ecffd1517d31c316c93de7d0a2747c8b954461571f53ffc
MD5 72f58d2d86e4ffddc80a2412be7394a5
SHA1 5adb42cedae8743378db041c3a55deb2127408c0
SHA512 3b5b72028830f9f8c7d5b6dbb015788725e92aa60b59caa9a69fdc1136b2739c81a6e4d526513a3b611ceec22252430b1aafa8b4b7da75d6de7e00c42c5b33f2
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2i:4Ly2Kerc64CiGImVu8p4kojWh2i
TLSH
T188334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1500-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1500-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3936-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3936-13-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4280-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4280-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads