juko | 2de9ddb1d7f154cb72bc0233f0d70925e3baef01c0ede456037f0ffc5bdfd4f8

General

Target
2026-08-08_2f3b9136b3f6a6c791287bc05ba2a3b5_elex_wannacry.exe
Size 68KB
Sample260808-kxj34scf47
SHA256 2de9ddb1d7f154cb72bc0233f0d70925e3baef01c0ede456037f0ffc5bdfd4f8
MD5 2f3b9136b3f6a6c791287bc05ba2a3b5
SHA1 142dce365759827534f4f582e2d82ea29990a859
SHA512 feee634bf5601fa3f71f9a8d02747999d1f8f4caba4de34039f72fb346ab40412fbf4c58285bb6a540ab81c810020f83a3673bf2b724b22b10b582f2f94ece16
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpa:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpa
TLSH
T12F63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/3820-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x00080000000187d5-5.dat	family_juko
behavioral2/memory/3820-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3548-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001300000001c43e-13.dat	family_juko
behavioral2/memory/2456-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2456-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3548	WINWORD.exe
2456	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-1-5-21-1875162379-3804078649-638427191-1000\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
4744	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-08_2f3b9136b3f6a6c791287bc05ba2a3b5_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

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
4744	cmd.exe
4328	PING.EXE
3168	PING.EXE
3296	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3168	PING.EXE
3296	PING.EXE
4328	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3820 wrote to memory of 3548	3820	2026-08-08_2f3b9136b3f6a6c791287bc05ba2a3b5_elex_wannacry.exe	90
PID 3548 wrote to memory of 4744	3548	WINWORD.exe	91
PID 4744 wrote to memory of 4328	4744	cmd.exe	93
PID 4744 wrote to memory of 3168	4744	cmd.exe	94
PID 4744 wrote to memory of 3296	4744	cmd.exe	95
PID 4744 wrote to memory of 2456	4744	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-08_2f3b9136b3f6a6c791287bc05ba2a3b5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_2f3b9136b3f6a6c791287bc05ba2a3b5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3820
- 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:3548
- - 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\0000139E" 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:4744
  - - 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:4328
  - - 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:3168
  - - 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:3296
  - - 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:2456

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

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Downloads

0000139E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000139E
Size 68KB
SHA256 37c0fb1d4f8d8eec56f01700dcfa858eb58ccc111490f28c28ba0aea79d412f8
MD5 8e10b3d8be94856b374c963427928f8f
SHA1 1beec4b3002e982a29d64cc11aa05031f9daec79
SHA512 c58eb87a987bd4fda4d485cd82322d2b873735badfc334d4b7ba6bc7154952c74d7589f6035d8291e0c1ca5330cc697a4ea60ee146734abf091bea58284a253e
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wp4:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwp4
TLSH
T1C363A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 2de9ddb1d7f154cb72bc0233f0d70925e3baef01c0ede456037f0ffc5bdfd4f8
MD5 2f3b9136b3f6a6c791287bc05ba2a3b5
SHA1 142dce365759827534f4f582e2d82ea29990a859
SHA512 feee634bf5601fa3f71f9a8d02747999d1f8f4caba4de34039f72fb346ab40412fbf4c58285bb6a540ab81c810020f83a3673bf2b724b22b10b582f2f94ece16
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpa:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpa
TLSH
T12F63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2456-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2456-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3548-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3820-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3820-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads