juko | 3b7572a207cfa4eadfeee2dfb8ee6cc9003574799a7a8e3d998440682dc88649

General

Target
2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe
Size 42KB
Sample260628-wtak2saz9v
SHA256 3b7572a207cfa4eadfeee2dfb8ee6cc9003574799a7a8e3d998440682dc88649
MD5 eaeafd6e6ec0fa3b964cc874e81cdf17
SHA1 b837d1ef915eeafb200f73f450f2628b52e005a3
SHA512 8a34ebe787d0eba22221e4192c6a9737e6fa2c19d6bd2319295f50bf873834f032ff3110047c5c497bdda4a2372641a71a32aab5ad7677d7056209a6b349797f
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f411:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+m
TLSH
T13C13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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/0x000600000001690d-4.dat	family_juko
behavioral1/files/0x0008000000024432-12.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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4592	WINWORD.exe
364	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-1-5-21-204488895-2999877624-296153668-1000\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	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	2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_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

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
1744	PING.EXE
1312	cmd.exe
4956	PING.EXE
4672	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4956	PING.EXE
4672	PING.EXE
1744	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4040 wrote to memory of 4592	4040	2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe	86
PID 4592 wrote to memory of 1312	4592	WINWORD.exe	87
PID 1312 wrote to memory of 4956	1312	cmd.exe	89
PID 1312 wrote to memory of 4672	1312	cmd.exe	90
PID 1312 wrote to memory of 1744	1312	cmd.exe	91
PID 1312 wrote to memory of 364	1312	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4040
- 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:4592
- - 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\000040FA" 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:1312
  - - 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:4956
  - - 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:4672
  - - 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:1744
  - - 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:364

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

Replay Monitor

Loading Replay Monitor...

Downloads

000040FA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040FA
Size 42KB
SHA256 2cf315884093e36338372cf5fb664e3d5095fe2c80a451456dae2deb599ac81d
MD5 5251a19d4abb79cc25f31d3b5a525db6
SHA1 d84a15ff18de241a393cb99fdf8f0d6dc37be25b
SHA512 37bfe51c97453d6f976eb96d61e5e7466a62294cf5f8f098f47aaadbdf9170a0085b44b468f11b0629a8bc8a9c6ebd6debad0193fe75155a2a1522fe7f8fa3b5
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f416:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+t
TLSH
T18E13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 3b7572a207cfa4eadfeee2dfb8ee6cc9003574799a7a8e3d998440682dc88649
MD5 eaeafd6e6ec0fa3b964cc874e81cdf17
SHA1 b837d1ef915eeafb200f73f450f2628b52e005a3
SHA512 8a34ebe787d0eba22221e4192c6a9737e6fa2c19d6bd2319295f50bf873834f032ff3110047c5c497bdda4a2372641a71a32aab5ad7677d7056209a6b349797f
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f411:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+m
TLSH
T13C13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads