juko | 8690db4666533c54b9b31956f0e9839596fe72cf57dbe1a821f9485923039ea0

General

Target
2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe
Size 68KB
Sample260531-c7cssagy9w
SHA256 8690db4666533c54b9b31956f0e9839596fe72cf57dbe1a821f9485923039ea0
MD5 c361e60acae3aa7af96d3a900074d566
SHA1 00b65bc6739fd2520f981bdb80fe3945de86d2ef
SHA512 cdaf3328478debbcaa83647525debab14a13e8a101108b20b9a7bb7daf834797a8de5a23fedd2c78a87819c9aa07759a29e9911ddac3f3c27a6a4796f057a080
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpx:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpx
TLSH
T12F63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/1284-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x002000000002b349-5.dat	family_juko
behavioral2/memory/1284-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1836-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001c00000002b47f-15.dat	family_juko
behavioral2/memory/4476-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4476-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1836	WINWORD.exe
4476	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-1-5-21-2654269261-3199571979-4291878722-1000\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

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	2026-05-31_c361e60acae3aa7af96d3a900074d566_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
4908	PING.EXE
4960	PING.EXE
3828	PING.EXE
4016	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4908	PING.EXE
4960	PING.EXE
3828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1284 wrote to memory of 1836	1284	2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe	83
PID 1836 wrote to memory of 4016	1836	WINWORD.exe	84
PID 4016 wrote to memory of 4908	4016	cmd.exe	86
PID 4016 wrote to memory of 4960	4016	cmd.exe	87
PID 4016 wrote to memory of 3828	4016	cmd.exe	88
PID 4016 wrote to memory of 4476	4016	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1284
- 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:1836
- - 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\0000359C" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4016
  - - 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:4908
  - - 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:4960
  - - 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:3828
  - - 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:4476

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

0000359C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000359C
Size 68KB
SHA256 05b768724da33e933171a67a5dd57dc0abda0d21c5273e1a0d3bf206ff0d0280
MD5 d1911c7bf93f0b671bef2f4252a345b9
SHA1 6353ef79d34dda04ba682f002707ef3a09fa2ad8
SHA512 5551d1d7dee2a11a80b39bfaeec360bae93063001c9fe351cc62ea4b8ee55b0701274f4c8051b42159758e0410fa35275b3adb4b03b270922203105a9e06ef29
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wp8:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwp8
TLSH
T18E63A0B629761011C48BD478E9186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 8690db4666533c54b9b31956f0e9839596fe72cf57dbe1a821f9485923039ea0
MD5 c361e60acae3aa7af96d3a900074d566
SHA1 00b65bc6739fd2520f981bdb80fe3945de86d2ef
SHA512 cdaf3328478debbcaa83647525debab14a13e8a101108b20b9a7bb7daf834797a8de5a23fedd2c78a87819c9aa07759a29e9911ddac3f3c27a6a4796f057a080
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpx:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpx
TLSH
T12F63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1284-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1284-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1836-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4476-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4476-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads