juko | 156727409640e0499b4d2280311c9b286cad4496a8c8cc1b2d66c601f1188b32

General

Target
2026-05-17_93a7f3d835fd98ca0df60573cb49782b_elex_wannacry.exe
Size 32KB
Sample260517-s6dxfset6m
SHA256 156727409640e0499b4d2280311c9b286cad4496a8c8cc1b2d66c601f1188b32
MD5 93a7f3d835fd98ca0df60573cb49782b
SHA1 290e8da40724717c91dc7ef30b4c60f056ae1ef1
SHA512 0ed5e2ab26a9eba0eaf8784d92e297e4904e45f0347b0e5b12993f6a6e565c6f7025e6c34a5dd6c13070538a55c9ca08e15e2826427972d1e073152e74f86139
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpb:OLsF2Kerc64sTiX2IV0Dhub
TLSH
T1D0E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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
behavioral1/files/0x0015000000024158-4.dat	family_juko
behavioral1/files/0x000900000002424d-12.dat	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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-05-17_93a7f3d835fd98ca0df60573cb49782b_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4116	WINWORD.exe
3276	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-1-5-21-889581200-2041691093-2048517887-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-17_93a7f3d835fd98ca0df60573cb49782b_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

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
4516	PING.EXE
620	PING.EXE
2588	PING.EXE
3284	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4516	PING.EXE
620	PING.EXE
2588	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3108 wrote to memory of 4116	3108	2026-05-17_93a7f3d835fd98ca0df60573cb49782b_elex_wannacry.exe	84
PID 4116 wrote to memory of 3284	4116	WINWORD.exe	85
PID 3284 wrote to memory of 4516	3284	cmd.exe	87
PID 3284 wrote to memory of 620	3284	cmd.exe	88
PID 3284 wrote to memory of 2588	3284	cmd.exe	89
PID 3284 wrote to memory of 3276	3284	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-17_93a7f3d835fd98ca0df60573cb49782b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_93a7f3d835fd98ca0df60573cb49782b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3108
- 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:4116
- - 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\00003821" 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:3284
  - - 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:4516
  - - 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:620
  - - 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:2588
  - - 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:3276

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

00003821

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003821
Size 32KB
SHA256 b5b9ff6aefe0f2e25eb51ba4a4ecbfac1d4d1b9cd2ec10dc9ee8e4aee7d5f7c4
MD5 63cae43123e0a5e01ac8e78c00dea61c
SHA1 4fb49608e7ce012eeea85087e700f4b801d3b53d
SHA512 ff960a728a95df5235c17aef5e0b38632f8dcfc626e4e10a0ed0e311d582cc2ce72672d9350d650ae9bdc3cbfd86adb090573444904a59f959a3db4e6304859b
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpO:OLsF2Kerc64sTiX2IV0DhuO
TLSH
T177E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 156727409640e0499b4d2280311c9b286cad4496a8c8cc1b2d66c601f1188b32
MD5 93a7f3d835fd98ca0df60573cb49782b
SHA1 290e8da40724717c91dc7ef30b4c60f056ae1ef1
SHA512 0ed5e2ab26a9eba0eaf8784d92e297e4904e45f0347b0e5b12993f6a6e565c6f7025e6c34a5dd6c13070538a55c9ca08e15e2826427972d1e073152e74f86139
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpb:OLsF2Kerc64sTiX2IV0Dhub
TLSH
T1D0E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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