juko | 203dbceb9981b1fe4b2a570baf8feb64b57193939a725ec401c97f2b78b854e1

General

Target
2026-10-26_c54a09ea8c0dc02da62cffdfe27c68b8_elex_wannacry.exe
Size 35KB
Sample261027-h4654sbs8y
SHA256 203dbceb9981b1fe4b2a570baf8feb64b57193939a725ec401c97f2b78b854e1
MD5 c54a09ea8c0dc02da62cffdfe27c68b8
SHA1 6b0b24fe30c644db35567aeef1092ab1f4f5291e
SHA512 78f8d6c47b399624fa201d972c38e6cb901969af94b36c29bb57d82e228a1cc0cc602bd96b3f130e79679aa2019562b98921a50677dcc0e10993ab29f0d932c1
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/NR:vLsF2Kerc64sTiX2IV0DhuX/NR
TLSH
T107F23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
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/932-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000d00000001b834-4.dat	family_juko
behavioral2/memory/932-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/3444-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c514-13.dat	family_juko
behavioral2/memory/4604-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/4604-17-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3444	WINWORD.exe
4604	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-1-5-21-2304238888-3968896904-642854331-1000\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
2692	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-26_c54a09ea8c0dc02da62cffdfe27c68b8_elex_wannacry.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
2692	cmd.exe
2036	PING.EXE
844	PING.EXE
1320	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2036	PING.EXE
844	PING.EXE
1320	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 932 wrote to memory of 3444	932	2026-10-26_c54a09ea8c0dc02da62cffdfe27c68b8_elex_wannacry.exe	89
PID 3444 wrote to memory of 2692	3444	WINWORD.exe	90
PID 2692 wrote to memory of 2036	2692	cmd.exe	92
PID 2692 wrote to memory of 844	2692	cmd.exe	93
PID 2692 wrote to memory of 1320	2692	cmd.exe	94
PID 2692 wrote to memory of 4604	2692	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_c54a09ea8c0dc02da62cffdfe27c68b8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_c54a09ea8c0dc02da62cffdfe27c68b8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:932
- 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:3444
- - 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\0000144A" 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:2692
  - - 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:2036
  - - 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:844
  - - 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:1320
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4604

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000144A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000144A
Size 35KB
SHA256 c7fbedddbdd97b1d4d75b58741a3b031a0d1a28cfd0c4002767df4be919e2fb1
MD5 6736f030379c5eba8c0e3c65cf4fb524
SHA1 843294749bb1466019a20c8a30d2c4a3051ed50e
SHA512 3b1b835f3619a3aba438f5a05ef4151c9c145596f72237c4e6d2c8b59444ef46bafd54e662c2ad4a59f69a7a5798ce0d80d26e7c607dc2bddb2dbf8628f6adb1
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/NI:vLsF2Kerc64sTiX2IV0DhuX/NI
TLSH
T12EF23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 35KB
SHA256 203dbceb9981b1fe4b2a570baf8feb64b57193939a725ec401c97f2b78b854e1
MD5 c54a09ea8c0dc02da62cffdfe27c68b8
SHA1 6b0b24fe30c644db35567aeef1092ab1f4f5291e
SHA512 78f8d6c47b399624fa201d972c38e6cb901969af94b36c29bb57d82e228a1cc0cc602bd96b3f130e79679aa2019562b98921a50677dcc0e10993ab29f0d932c1
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/NR:vLsF2Kerc64sTiX2IV0DhuX/NR
TLSH
T107F23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/932-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/932-10-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/3444-12-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4604-16-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4604-17-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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