juko | 66c3f97a8916505742b46514c8e4d0c0c0aae6a85812685177e195b5a115225c

General

Target
2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe
Size 49KB
Sample260527-e4vwase18p
SHA256 66c3f97a8916505742b46514c8e4d0c0c0aae6a85812685177e195b5a115225c
MD5 46bc16d3c775c5cecea0dadf712fca8c
SHA1 ee2ff821bf0bcea5228205e0e16023eeec5d0d1b
SHA512 84f96bbff8ef90f452cac4c144296a1ffcf1cb54f40a9232c599ef0a12334bc9f3c9c3fd73c6079a2f1ac76b95a4f3879809d18eebf1339a9d715d7a89a0f471
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2T:VLy2Kerc64CiGImVu8p4kojWh2T
TLSH
T191334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4492-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000024366-5.dat	family_juko
behavioral1/memory/4492-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2080-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024541-15.dat	family_juko
behavioral1/memory/4332-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4332-18-0x0000000000400000-0x0000000000420000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2080	WINWORD.exe
4332	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-1-5-21-540052884-2969440504-464782435-1000\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	2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_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

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
2388	PING.EXE
4220	PING.EXE
4496	cmd.exe
4964	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2388	PING.EXE
4220	PING.EXE
4964	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4492 wrote to memory of 2080	4492	2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe	90
PID 2080 wrote to memory of 4496	2080	WINWORD.exe	91
PID 4496 wrote to memory of 4964	4496	cmd.exe	93
PID 4496 wrote to memory of 2388	4496	cmd.exe	94
PID 4496 wrote to memory of 4220	4496	cmd.exe	95
PID 4496 wrote to memory of 4332	4496	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4492
- 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:2080
- - 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\000013C6" 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:4496
  - - 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:4964
  - - 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:2388
  - - 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:4220
  - - 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:4332

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

000013C6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000013C6
Size 49KB
SHA256 2ed445c64800360e3e290959db498188e8e506c12d772cd603a9338774b35648
MD5 461f1a9ab6ce158b8505963829277a69
SHA1 59c2d7efc722f95672385932481b086859fa120d
SHA512 4341f290fc6431d8b5b233503ac77f1cad4fed78976bf245c2dd2e26a8aa7da771e43fa3b781199ce39f75048144dd01cc45f584cde13179897cde5e51897a46
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2u:VLy2Kerc64CiGImVu8p4kojWh2u
TLSH
T117334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 66c3f97a8916505742b46514c8e4d0c0c0aae6a85812685177e195b5a115225c
MD5 46bc16d3c775c5cecea0dadf712fca8c
SHA1 ee2ff821bf0bcea5228205e0e16023eeec5d0d1b
SHA512 84f96bbff8ef90f452cac4c144296a1ffcf1cb54f40a9232c599ef0a12334bc9f3c9c3fd73c6079a2f1ac76b95a4f3879809d18eebf1339a9d715d7a89a0f471
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2T:VLy2Kerc64CiGImVu8p4kojWh2T
TLSH
T191334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2080-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4332-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4332-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4492-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4492-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads