juko | c04ee6d320195def994b83125325204285ab71b3ea4b89d6f6683a1bcc555e50

General

Target
2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe
Size 87KB
Sample260720-c2pkdsft8s
SHA256 c04ee6d320195def994b83125325204285ab71b3ea4b89d6f6683a1bcc555e50
MD5 ca5364d17c272bcbb1e1dbad38c54ca3
SHA1 b8b6aa886c145216a92638cad40937c502ee1de8
SHA512 359560eb4a805c8991247a4e7a353c27e35f9783427f178e2814149ef2230de522acfa19cd20ea1e9f36ce456bcfd6da6309a1ccdec9fb6d253409f23295ab2c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpu:2Ly2Kerc64CiGIm1K851YO6EQkwpu
TLSH
T10893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4632-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b867-5.dat	family_juko
behavioral2/memory/4632-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3128-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c5cb-13.dat	family_juko
behavioral2/memory/4220-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4220-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3128	WINWORD.exe
4220	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-1-5-21-3986082593-3624157295-3514260330-1000\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
5944	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	2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_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
5944	cmd.exe
3332	PING.EXE
3700	PING.EXE
3620	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3332	PING.EXE
3700	PING.EXE
3620	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4632 wrote to memory of 3128	4632	2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe	89
PID 3128 wrote to memory of 5944	3128	WINWORD.exe	90
PID 5944 wrote to memory of 3332	5944	cmd.exe	92
PID 5944 wrote to memory of 3700	5944	cmd.exe	93
PID 5944 wrote to memory of 3620	5944	cmd.exe	94
PID 5944 wrote to memory of 4220	5944	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4632
- 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:3128
- - 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\00003312" 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:5944
  - - 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:3332
  - - 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:3700
  - - 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:3620
  - - 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:4220

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

00003312

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003312
Size 87KB
SHA256 c7946216dae8d41ca41bf7f817a166196693fa59cc52c9a5d2bb7ca76dbd7c87
MD5 4012ae268e6fbb84fad141951a1a4512
SHA1 aac56cc65c8faeac0bc9893ac02f0e73ba9820f2
SHA512 d78d6dfcaa81a55637414808cc7eb349dcd4f5a2aff365942a132c7e24a26698a2c4cba46905b7bd04029224aba1bd8a6e7d5495d2a43e0ece1ade3502add263
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T17793A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 c04ee6d320195def994b83125325204285ab71b3ea4b89d6f6683a1bcc555e50
MD5 ca5364d17c272bcbb1e1dbad38c54ca3
SHA1 b8b6aa886c145216a92638cad40937c502ee1de8
SHA512 359560eb4a805c8991247a4e7a353c27e35f9783427f178e2814149ef2230de522acfa19cd20ea1e9f36ce456bcfd6da6309a1ccdec9fb6d253409f23295ab2c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpu:2Ly2Kerc64CiGIm1K851YO6EQkwpu
TLSH
T10893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3128-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4220-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4220-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4632-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4632-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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