juko | b543dd8a9edeb74dd2c9a14496e89c17690c216efe4c540e0584a896830136b2

General

Target
2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe
Size 49KB
Sample260420-a7bjlsay4x
SHA256 b543dd8a9edeb74dd2c9a14496e89c17690c216efe4c540e0584a896830136b2
MD5 ae00dd80ac146b767e225e9ff0b215f5
SHA1 1f952bbc685298b2a8bda2871ec5992ebda4959e
SHA512 c70fe1dfe67be5cac0858dca0fb149ccc2e82f153b59c6d3916767c5d772ae121e25bc687eead67bc3b1e3fa48b33f600db5d884d0fca4bfc94fb1e1c06c3baa
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h21:VLy2Kerc64CiGImVu8p4kojWh21
TLSH
T1D1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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
behavioral2/memory/1472-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001100000002ad90-5.dat	family_juko
behavioral2/memory/1472-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2444-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3c9-15.dat	family_juko
behavioral2/memory/1500-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1500-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2444	WINWORD.exe
1500	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-1-5-21-2397528088-2630719772-1129911217-1000\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	2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_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
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
1512	PING.EXE
4968	cmd.exe
5036	PING.EXE
5096	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1512	PING.EXE
5036	PING.EXE
5096	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1472 wrote to memory of 2444	1472	2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe	79
PID 2444 wrote to memory of 4968	2444	WINWORD.exe	80
PID 4968 wrote to memory of 5036	4968	cmd.exe	82
PID 4968 wrote to memory of 5096	4968	cmd.exe	83
PID 4968 wrote to memory of 1512	4968	cmd.exe	84
PID 4968 wrote to memory of 1500	4968	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1472
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2444
- - 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\0000188E" 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:4968
  - - 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:5036
  - - 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:5096
  - - 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:1512
  - - 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:1500

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

0000188E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000188E
Size 49KB
SHA256 acf84bdc4d036690d28ff8a4d4910ce9b8c3a8c3b3f0c964e4a03aa24bce7f51
MD5 574eec11a1050e3cc78a778cc2c8d7bc
SHA1 da9865b582b80246252df684059b6eee24f521af
SHA512 e7bd3580f85e51559dc8ed7597ae2b27ddd7ce2cadb2b83c032e0305a2d8de74ca4cf0ef4af34069312117e5a4222f1fa9957d2ea2aeceb539a192114eb18d3e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2J:VLy2Kerc64CiGImVu8p4kojWh2J
TLSH
T19A334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 b543dd8a9edeb74dd2c9a14496e89c17690c216efe4c540e0584a896830136b2
MD5 ae00dd80ac146b767e225e9ff0b215f5
SHA1 1f952bbc685298b2a8bda2871ec5992ebda4959e
SHA512 c70fe1dfe67be5cac0858dca0fb149ccc2e82f153b59c6d3916767c5d772ae121e25bc687eead67bc3b1e3fa48b33f600db5d884d0fca4bfc94fb1e1c06c3baa
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h21:VLy2Kerc64CiGImVu8p4kojWh21
TLSH
T1D1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1472-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1472-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1500-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1500-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2444-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads