juko | bedfbe4fba7f92f930c3702e0b7360509dd52cf7f81f507bbad69b95fd0df8aa

General

Target
2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe
Size 32KB
Sample260511-e43wxaew9p
SHA256 bedfbe4fba7f92f930c3702e0b7360509dd52cf7f81f507bbad69b95fd0df8aa
MD5 1d7f4e3ccdb608bb4f08b6f5a9eb5be2
SHA1 4d550a8894540415184fd51d47e991785bf34b52
SHA512 d056d70df6933ab3a72ca673cb757a62a08c60ab00494d841009e66317382a66c16f22b9308a98185bebd3de274be87e7ebd92ddd2e238df93481830746a932e
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpi:OLsF2Kerc64sTiX2IV0Dhui
TLSH
T108E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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/0x0005000000023076-5.dat	family_juko
behavioral1/files/0x0009000000024435-14.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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4292	WINWORD.exe
3716	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-1-5-21-312252282-3884318443-358092420-1000\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	2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_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
3088	PING.EXE
3212	PING.EXE
3876	PING.EXE
2480	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3088	PING.EXE
3212	PING.EXE
3876	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3384 wrote to memory of 4292	3384	2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe	85
PID 4292 wrote to memory of 2480	4292	WINWORD.exe	86
PID 2480 wrote to memory of 3088	2480	cmd.exe	88
PID 2480 wrote to memory of 3212	2480	cmd.exe	89
PID 2480 wrote to memory of 3876	2480	cmd.exe	90
PID 2480 wrote to memory of 3716	2480	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3384
- 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:4292
- - 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\00007CCF" 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:2480
  - - 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:3088
  - - 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:3212
  - - 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:3876
  - - 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:3716

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

00007CCF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007CCF
Size 32KB
SHA256 62d3662182ead090c8d4b35c8299a6f191e8cb067a2d27009604165f065e14fb
MD5 8f42733ecd306f3f7be1670902f629dd
SHA1 7e5c952d4e5513ff15f7bd125addf8e94e27cd0c
SHA512 7c02d2e452118d5ebd7e95da2b945e55ecddb8e1deeb303916de8431f7351d9e2a362f1e6dc08999bac57e77dc7a2b5d6891457831d17539b6b5fda3bdf3030e
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpE:OLsF2Kerc64sTiX2IV0DhuE
TLSH
T185E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 bedfbe4fba7f92f930c3702e0b7360509dd52cf7f81f507bbad69b95fd0df8aa
MD5 1d7f4e3ccdb608bb4f08b6f5a9eb5be2
SHA1 4d550a8894540415184fd51d47e991785bf34b52
SHA512 d056d70df6933ab3a72ca673cb757a62a08c60ab00494d841009e66317382a66c16f22b9308a98185bebd3de274be87e7ebd92ddd2e238df93481830746a932e
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpi:OLsF2Kerc64sTiX2IV0Dhui
TLSH
T108E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3384-11-0x0000000000420000-0x0000000000465000-memory.dmp

Download

memory/3716-16-0x0000000000530000-0x0000000000575000-memory.dmp

Download

memory/4292-13-0x0000000000510000-0x0000000000555000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads