juko | c8cf80edab1cdb09d629adcf2eedb8f979b1fc12cca880335936b08aee862417

General

Target
2026-10-01_8546894242846eba62faf53e4b190632_elex_wannacry.exe
Size 37KB
Sample261002-l2l9pswt6p
SHA256 c8cf80edab1cdb09d629adcf2eedb8f979b1fc12cca880335936b08aee862417
MD5 8546894242846eba62faf53e4b190632
SHA1 bf893675a17636e289a15a221904926c4b3faa10
SHA512 3475ea62d998c2db1968983e3f564a54cdc42a9c2d526008ecd80464db31497a29adeb87bc6c0f572d922cb49e22e857628d7430b0ee2b790051d7d20af42d54
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOly:3LsF2Kerc64sTiX2IV0D5tcz9+OOE
TLSH
T1E003491B69A46042C1A312B0FD991F35857E9DB814E7B052A744BA5C2CB2E63DF70ECE
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/0x000700000001b85a-3.dat	family_juko
behavioral2/files/0x000e00000001c564-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5800	WINWORD.exe
4228	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
2444	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	2026-10-01_8546894242846eba62faf53e4b190632_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
2444	cmd.exe
2112	PING.EXE
3596	PING.EXE
4844	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4844	PING.EXE
2112	PING.EXE
3596	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1248 wrote to memory of 5800	1248	2026-10-01_8546894242846eba62faf53e4b190632_elex_wannacry.exe	89
PID 5800 wrote to memory of 2444	5800	WINWORD.exe	90
PID 2444 wrote to memory of 2112	2444	cmd.exe	92
PID 2444 wrote to memory of 3596	2444	cmd.exe	93
PID 2444 wrote to memory of 4844	2444	cmd.exe	94
PID 2444 wrote to memory of 4228	2444	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-01_8546894242846eba62faf53e4b190632_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-01_8546894242846eba62faf53e4b190632_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1248
- 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:5800
- - 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\0000429B" 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:2444
  - - 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:2112
  - - 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:3596
  - - 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:4844
  - - 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:4228

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

Replay Monitor

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Downloads

0000429B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000429B
Size 37KB
SHA256 0bb6d7e55274695f82fe92ba8ecc3c126f25d476eb009aa553fd901af5b0a471
MD5 fd024d92ef1b34df4931102e51e41042
SHA1 d28a1febced22006e22586a6181325a800b8bd48
SHA512 07936f371c4d8760334292770c00fd887f9768c9a4093f81a32168be9fa5f1bd776c712cc9181627096d887a409a7ea2de890631d6d2e095a745564538b3b125
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOlA:3LsF2Kerc64sTiX2IV0D5tcz9+OOq
TLSH
T1EE03491B69A46042C1A312B0FD991F35857E9DB814E7B052A744BA5C2CB2E63DF70ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 c8cf80edab1cdb09d629adcf2eedb8f979b1fc12cca880335936b08aee862417
MD5 8546894242846eba62faf53e4b190632
SHA1 bf893675a17636e289a15a221904926c4b3faa10
SHA512 3475ea62d998c2db1968983e3f564a54cdc42a9c2d526008ecd80464db31497a29adeb87bc6c0f572d922cb49e22e857628d7430b0ee2b790051d7d20af42d54
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOly:3LsF2Kerc64sTiX2IV0D5tcz9+OOE
TLSH
T1E003491B69A46042C1A312B0FD991F35857E9DB814E7B052A744BA5C2CB2E63DF70ECE
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