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 7 IoCs

resource	yara_rule
behavioral1/memory/4216-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0006000000009db7-5.dat	family_juko
behavioral1/memory/4216-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1444-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000700000001e3e4-15.dat	family_juko
behavioral1/memory/5052-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5052-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1444	WINWORD.exe
5052	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-1-5-21-876885714-46325919-1482798410-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.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
1280	PING.EXE
4496	PING.EXE
1988	cmd.exe
1372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1372	PING.EXE
1280	PING.EXE
4496	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4216 wrote to memory of 1444	4216	2026-05-17_72f58d2d86e4ffddc80a2412be7394a5_elex_wannacry.exe	84
PID 1444 wrote to memory of 1988	1444	WINWORD.exe	85
PID 1988 wrote to memory of 1372	1988	cmd.exe	87
PID 1988 wrote to memory of 1280	1988	cmd.exe	88
PID 1988 wrote to memory of 4496	1988	cmd.exe	89
PID 1988 wrote to memory of 5052	1988	cmd.exe	90

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4216
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1444
- - 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\000022CC" 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:1988
  - - 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:1372
  - - 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:1280
  - - 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:4496
  - - 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:5052

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

000022CC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000022CC
Size 49KB
SHA256 d70d4ba59032b84414bde13c046919cfda7a37447fac59c818b138a0892fae89
MD5 727ee7f2a18d716d1d439014f6ee4c68
SHA1 9053e6619b18c66b2a8db63263a8382f9ed89e4e
SHA512 43a5acd3ed7d7b8c0fe8a439c1b2e0aa46b98773cd11fb10d47db1bf9caae7d7f43a32b07488f9100b594fb7d57e6841160f2e276555a2ef8f8fcca4077e8bba
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2C:4Ly2Kerc64CiGImVu8p4kojWh2C
TLSH
T14D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/1444-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4216-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4216-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5052-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5052-18-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads