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
behavioral2/files/0x000c00000001b2fd-3.dat	family_juko
behavioral2/files/0x000f00000001c466-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3396	WINWORD.exe
2416	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-1-5-21-1404337215-1550464601-2805570857-1000\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
4376	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	2026-10-06_927d7e39da71c2885b26b5c03635e4e5_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
4376	cmd.exe
1172	PING.EXE
3040	PING.EXE
2792	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2792	PING.EXE
1172	PING.EXE
3040	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 3396	2680	2026-10-06_927d7e39da71c2885b26b5c03635e4e5_elex_wannacry.exe	90
PID 3396 wrote to memory of 4376	3396	WINWORD.exe	91
PID 4376 wrote to memory of 1172	4376	cmd.exe	93
PID 4376 wrote to memory of 3040	4376	cmd.exe	94
PID 4376 wrote to memory of 2792	4376	cmd.exe	95
PID 4376 wrote to memory of 2416	4376	cmd.exe	96

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2680
- 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:3396
- - 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\0000109E" 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:4376
  - - 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:1172
  - - 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:3040
  - - 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:2792
  - - 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:2416

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

0000109E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000109E
Size 47KB
SHA256 0022a59ded29e29943628bf8c56c9db8c633d2e886d1d5d8a6789eceb8787e16
MD5 61cd58026a5bca20167bf15205d5a753
SHA1 149a67405b8294f360645c438e344374b1ec5354
SHA512 e410a450dab2f8b7642cf384d8890da78df34caa71e8abffba84d03c6d29a60c792477c00e4da046efb43d583d92ca083834014a1e15594dec47bd2ca31c0d6b
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6J:ALsF2Kerc64sTiX2IV0DZZToJ
TLSH
T18A235A1BFE616052C19611B0FD699F3585799CB4047BB162B780BB1D28B2DA3CF709CD
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