juko | 2a50a8b30ce8c6e73a1bb8b7aad6bc1c4a44cf9c80b8a41bfe32af72da24c3df

General

Target
2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe
Size 42KB
Sample261023-ef52cswthv
SHA256 2a50a8b30ce8c6e73a1bb8b7aad6bc1c4a44cf9c80b8a41bfe32af72da24c3df
MD5 ec5a644aa3b3795fe9234e20555add8c
SHA1 c2dd65a1bcc490a885156542645de4468cd74bfd
SHA512 a87fc188a64e68c958e51793696a6d736e4645640fef139e42965e801ed541a8f28aa65169efb7440bf342ea9d2c8b38c16e7c13f883cedef3eebd7101a221f7
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41Y:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+f
TLSH
T19D13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x0013000000023267-3.dat	family_juko
behavioral1/files/0x00090000000246cb-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-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4136	WINWORD.exe
3348	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-1-5-21-2091445952-3649787497-104050984-1000\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
5992	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	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	2026-10-22_ec5a644aa3b3795fe9234e20555add8c_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

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
5992	cmd.exe
3992	PING.EXE
4496	PING.EXE
3760	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3760	PING.EXE
3992	PING.EXE
4496	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4544 wrote to memory of 4136	4544	2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe	84
PID 4136 wrote to memory of 5992	4136	WINWORD.exe	85
PID 5992 wrote to memory of 3992	5992	cmd.exe	87
PID 5992 wrote to memory of 4496	5992	cmd.exe	88
PID 5992 wrote to memory of 3760	5992	cmd.exe	89
PID 5992 wrote to memory of 3348	5992	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4544
- 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:4136
- - 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\00006E3A" 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:5992
  - - 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:3992
  - - 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:4496
  - - 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:3760
  - - 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:3348

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

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00006E3A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006E3A
Size 42KB
SHA256 6e60dea25191c2d04eb7aa302da2864bb1d29687ecdd1ac4b4c36b95bad2c4ce
MD5 cc2c98e3df5515ec8fc9221fca97a8e9
SHA1 c5a47025b8dfc1cd84399e30da8b9960790790cf
SHA512 e695a2818e4d4911b8db657e5e9f3929d6268b7057bcccec954cabca189f31b5da676947f7e1413e7e1106b0026e02c81bd62910a6ecb4b539fccb054fb7af23
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f411:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+O
TLSH
T19F13171776A460D2CDB76074E91A4E34437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 2a50a8b30ce8c6e73a1bb8b7aad6bc1c4a44cf9c80b8a41bfe32af72da24c3df
MD5 ec5a644aa3b3795fe9234e20555add8c
SHA1 c2dd65a1bcc490a885156542645de4468cd74bfd
SHA512 a87fc188a64e68c958e51793696a6d736e4645640fef139e42965e801ed541a8f28aa65169efb7440bf342ea9d2c8b38c16e7c13f883cedef3eebd7101a221f7
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41Y:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+f
TLSH
T19D13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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