juko | f4ae37be647603301fba41f05de76789810c491a95356f5c490e3212ea391cad

General

Target
2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.exe
Size 47KB
Sample261007-3chzesfx41
SHA256 f4ae37be647603301fba41f05de76789810c491a95356f5c490e3212ea391cad
MD5 927d7e39da71c2885b26b5c03635e4e5
SHA1 8bff90513438d44e31892bf470f08ad18b2ab29e
SHA512 ffb08ff533a01ac37cc59742db3f611c14d77e1288f53427800fd95f023337df79ce90dd600bfd896a4c5b0d7e099f33cd976f5780592470d86197c152f9e82a
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6M:ALsF2Kerc64sTiX2IV0DZZToM
TLSH
T13A235A1BFE616052C19611B0FD699F3585799CB4047BB162B780BB1D28B2EA3CF709CD
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/0x00070000000004ec-3.dat	family_juko
behavioral1/files/0x0003000000022bcf-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-1-5-21-1696934516-3600988056-1840298893-1000\Control Panel\International\Geo\Nation	2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1696934516-3600988056-1840298893-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4576	WINWORD.exe
876	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-1-5-21-1696934516-3600988056-1840298893-1000\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
2272	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\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.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
2272	cmd.exe
3968	PING.EXE
4476	PING.EXE
4720	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4476	PING.EXE
4720	PING.EXE
3968	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4204 wrote to memory of 4576	4204	2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.exe	90
PID 4576 wrote to memory of 2272	4576	WINWORD.exe	91
PID 2272 wrote to memory of 3968	2272	cmd.exe	93
PID 2272 wrote to memory of 4476	2272	cmd.exe	98
PID 2272 wrote to memory of 4720	2272	cmd.exe	99
PID 2272 wrote to memory of 876	2272	cmd.exe	103

C:\Users\Admin\AppData\Local\Temp\2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4204
- 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:4576
- - 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\00002FA1" 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:2272
  - - 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:3968
  - - 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:4476
  - - 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:4720
  - - 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:876

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

00002FA1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002FA1
Size 47KB
SHA256 3b83c569a5497f8c26c51846b654689cd82cb5d7749fcf9edfe59e0701265593
MD5 676467f956a8b826af142816007ac5be
SHA1 f6c633a1a9397b827d6154bf9b9af2916702c54e
SHA512 e2fbbff585f84f7a06da175cb13747902ec1fe7805cf5216b24caa9423398297b502d663fe5b1837d4d7add51009ecfc2b826a3d76b71a96763730539e0c0320
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6O:ALsF2Kerc64sTiX2IV0DZZToO
TLSH
T1DB235A1BFE616052C19611B0FD699F3585799CB4047BB162B780BB1D28B2DA3CF709CD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 f4ae37be647603301fba41f05de76789810c491a95356f5c490e3212ea391cad
MD5 927d7e39da71c2885b26b5c03635e4e5
SHA1 8bff90513438d44e31892bf470f08ad18b2ab29e
SHA512 ffb08ff533a01ac37cc59742db3f611c14d77e1288f53427800fd95f023337df79ce90dd600bfd896a4c5b0d7e099f33cd976f5780592470d86197c152f9e82a
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6M:ALsF2Kerc64sTiX2IV0DZZToM
TLSH
T13A235A1BFE616052C19611B0FD699F3585799CB4047BB162B780BB1D28B2EA3CF709CD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads