juko | 6a119c43e18ecd60014fcd64917422158eaf7f7b7ec708ebb81a4767f705aade

General

Target
2026-10-21_6e0a3aa4b272ea2bc979d064cfd3dc5c_elex_wannacry.exe
Size 49KB
Sample261022-2ac5qaat9l
SHA256 6a119c43e18ecd60014fcd64917422158eaf7f7b7ec708ebb81a4767f705aade
MD5 6e0a3aa4b272ea2bc979d064cfd3dc5c
SHA1 fc7955b2c5af98f01ba58ab954af43e1b7ef0544
SHA512 3018518e691b7adc8e79b12d7a93820bfb302d5a0e6586a92a50576df137ae449dc6816897ba5e59ff0f47318591d25405e85f2da2a1af0003c4391a022f66e7
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h25:VLy2Kerc64CiGImVu8p4kojWh25
TLSH
T118334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4284-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00170000000115be-4.dat	family_juko
behavioral2/memory/4284-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3368-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000600000001b846-13.dat	family_juko
behavioral2/memory/1892-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1892-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3368	WINWORD.exe
1892	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-1-5-21-4280978039-528710165-233981602-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5440	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe

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	2026-10-21_6e0a3aa4b272ea2bc979d064cfd3dc5c_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
5464	PING.EXE
1700	PING.EXE
4988	PING.EXE
5440	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5464	PING.EXE
1700	PING.EXE
4988	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4284 wrote to memory of 3368	4284	2026-10-21_6e0a3aa4b272ea2bc979d064cfd3dc5c_elex_wannacry.exe	89
PID 3368 wrote to memory of 5440	3368	WINWORD.exe	90
PID 5440 wrote to memory of 5464	5440	cmd.exe	92
PID 5440 wrote to memory of 1700	5440	cmd.exe	93
PID 5440 wrote to memory of 4988	5440	cmd.exe	94
PID 5440 wrote to memory of 1892	5440	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-21_6e0a3aa4b272ea2bc979d064cfd3dc5c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-21_6e0a3aa4b272ea2bc979d064cfd3dc5c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4284
- 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:3368
- - 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\0000626C" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5440
  - - 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:5464
  - - 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:1700
  - - 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:4988
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:1892

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000626C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000626C
Size 49KB
SHA256 7a3a70f60763368face978b32eaa341b276e654b4826e3e3737df8cbc87f591a
MD5 6482d53f97de386e20697e89bf94bbea
SHA1 db7becd289cc2599e20d90ac3b53c4a3551e48f3
SHA512 12d940854912b4a132a94a33f5916e7c5fbaa098d87c1c9c0f0001035698b700e43fc0e9d5f698b54189125dd6dd1bdf135cd565a4e5e2fc8f534cf9e0f0dbbe
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2f:VLy2Kerc64CiGImVu8p4kojWh2f
TLSH
T119334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 6a119c43e18ecd60014fcd64917422158eaf7f7b7ec708ebb81a4767f705aade
MD5 6e0a3aa4b272ea2bc979d064cfd3dc5c
SHA1 fc7955b2c5af98f01ba58ab954af43e1b7ef0544
SHA512 3018518e691b7adc8e79b12d7a93820bfb302d5a0e6586a92a50576df137ae449dc6816897ba5e59ff0f47318591d25405e85f2da2a1af0003c4391a022f66e7
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h25:VLy2Kerc64CiGImVu8p4kojWh25
TLSH
T118334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1892-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1892-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3368-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4284-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4284-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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