juko | 5ac22c8f916d38662315ba7ee2a937ec4e47f2eef14f90502baea8556e99113f

General

Target
2026-08-30_fed048b966d782663e06050bcae4ffac_elex_wannacry.exe
Size 56KB
Sample260830-3tphjat1ev
SHA256 5ac22c8f916d38662315ba7ee2a937ec4e47f2eef14f90502baea8556e99113f
MD5 fed048b966d782663e06050bcae4ffac
SHA1 2018d497ac99adecddc02f50bfd4810a33a3401d
SHA512 4f7356a8ad42529b9375ad6941ff12f617459c42c228705e9c33e737f9285d90be3e3ed37d68ab3a3e0e9b5073e57cf3929c83a59718cdd9051b83661fe988a5
SSDEEP 1536:pLsF2Kerc64sTiX2IV0DhuD8OKFVG9WGWI:pLy2Kerc64CiGImVuD8OKFE9WBI
TLSH
T1A44319263AE61CD3C15364F0EAE49B308078FD7219279023E794BB9815BEC92DF7199D
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/1496-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cc9-5.dat	family_juko
behavioral2/memory/1496-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4144-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c52a-13.dat	family_juko
behavioral2/memory/5040-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5040-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4144	WINWORD.exe
5040	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4652	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-30_fed048b966d782663e06050bcae4ffac_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

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
4328	PING.EXE
4652	cmd.exe
1560	PING.EXE
2076	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2076	PING.EXE
4328	PING.EXE
1560	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1496 wrote to memory of 4144	1496	2026-08-30_fed048b966d782663e06050bcae4ffac_elex_wannacry.exe	89
PID 4144 wrote to memory of 4652	4144	WINWORD.exe	90
PID 4652 wrote to memory of 1560	4652	cmd.exe	92
PID 4652 wrote to memory of 2076	4652	cmd.exe	93
PID 4652 wrote to memory of 4328	4652	cmd.exe	94
PID 4652 wrote to memory of 5040	4652	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-30_fed048b966d782663e06050bcae4ffac_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_fed048b966d782663e06050bcae4ffac_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1496
- 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:4144
- - 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\000018AD" 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:4652
  - - 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:1560
  - - 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:2076
  - - 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:\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:5040

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

000018AD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000018AD
Size 56KB
SHA256 65483ec6bedf67e6850896317b9bfa395e94628caf99aea5bd70a2e23216bc7a
MD5 c2f743295bef4fff7f3b44f351149d39
SHA1 0af4f519d2712baa2960544bbe76cd0cfb466f6e
SHA512 f389a85a2de8b1051c2b8aa29a6fe08a98f276184d77c0fda75aa67ac17c22b1f0498da3a420093126a88e68b0225f2014ffdc4477731e804d6f4c92d807dbcc
SSDEEP 1536:pLsF2Kerc64sTiX2IV0DhuD8OKFVG9WGWg:pLy2Kerc64CiGImVuD8OKFE9WBg
TLSH
T16E4319263AE61CD3C15364F0EAE49B308078FD7219279023E794BB9815BEC92DF7199D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 5ac22c8f916d38662315ba7ee2a937ec4e47f2eef14f90502baea8556e99113f
MD5 fed048b966d782663e06050bcae4ffac
SHA1 2018d497ac99adecddc02f50bfd4810a33a3401d
SHA512 4f7356a8ad42529b9375ad6941ff12f617459c42c228705e9c33e737f9285d90be3e3ed37d68ab3a3e0e9b5073e57cf3929c83a59718cdd9051b83661fe988a5
SSDEEP 1536:pLsF2Kerc64sTiX2IV0DhuD8OKFVG9WGWI:pLy2Kerc64CiGImVuD8OKFE9WBI
TLSH
T1A44319263AE61CD3C15364F0EAE49B308078FD7219279023E794BB9815BEC92DF7199D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1496-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1496-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4144-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5040-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5040-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads