juko | 432990ae46b68d621b74e44a4b1b9f12e8af917306900959c25a113cf3a903f3

General

Target
2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe
Size 37KB
Sample260730-jk423ser41
SHA256 432990ae46b68d621b74e44a4b1b9f12e8af917306900959c25a113cf3a903f3
MD5 cad49a8d272d10ea332b35b010d7b398
SHA1 4d850bbb7f9a19358955e216073ea83b54f4f915
SHA512 e4d3b85389b32de07cd96f79298f76ea2018ae18a51e2ba399283ebe432a06b59731bb28eeb73c1f6f8c0f07a0ce59492eebc5bbc7bf402e12b1f5824ce650e1
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogwb
TLSH
T126035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/4704-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000a00000001138e-5.dat	family_juko
behavioral2/memory/4704-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3788-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c454-13.dat	family_juko
behavioral2/memory/3808-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3808-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3788	WINWORD.exe
3808	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-1-5-21-1079202589-886135813-2527035092-1000\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
1096	cmd.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	2026-07-30_cad49a8d272d10ea332b35b010d7b398_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
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

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
1096	cmd.exe
3248	PING.EXE
4920	PING.EXE
5788	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3248	PING.EXE
4920	PING.EXE
5788	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4704 wrote to memory of 3788	4704	2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe	89
PID 3788 wrote to memory of 1096	3788	WINWORD.exe	90
PID 1096 wrote to memory of 3248	1096	cmd.exe	92
PID 1096 wrote to memory of 4920	1096	cmd.exe	93
PID 1096 wrote to memory of 5788	1096	cmd.exe	94
PID 1096 wrote to memory of 3808	1096	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4704
- 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:3788
- - 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\00003030" 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:1096
  - - 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:3248
  - - 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:4920
  - - 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:5788
  - - 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
      System Location Discovery: System Language Discovery
      PID:3808

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

00003030

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003030
Size 37KB
SHA256 0277976eb066dfcd0033f7575d9e7cbabe8f028d6da5d669526658092d773687
MD5 455a8fdfa1a9f821314cc8af34dfed20
SHA1 01dcf5503992ebaebcb508de06f3c792f4fad3a3
SHA512 8207c66254a41dc3ce5fd2def7bd8d09f74dba84d0aeaa5e67b2563eebd00352249278c3bd24690d63d6e8b25f4b1d3f51605cdc30d9be5a9203f16d55d1ca77
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaD:3LsF2Kerc64sTiX2IV0DhuogwE
TLSH
T1C3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 432990ae46b68d621b74e44a4b1b9f12e8af917306900959c25a113cf3a903f3
MD5 cad49a8d272d10ea332b35b010d7b398
SHA1 4d850bbb7f9a19358955e216073ea83b54f4f915
SHA512 e4d3b85389b32de07cd96f79298f76ea2018ae18a51e2ba399283ebe432a06b59731bb28eeb73c1f6f8c0f07a0ce59492eebc5bbc7bf402e12b1f5824ce650e1
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogwb
TLSH
T126035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3788-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3808-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3808-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4704-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4704-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads