juko | 5e6f0e6cdf549c3fb082a6d89539860fca0cdb7e3ea0212e4482bdc76f5ff1db

General

Target
2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe
Size 49KB
Sample260716-dfzznsft3x
SHA256 5e6f0e6cdf549c3fb082a6d89539860fca0cdb7e3ea0212e4482bdc76f5ff1db
MD5 2a1d622f7eccc8e53353bf5ec0c8acbd
SHA1 cad6c38bf88f3f3201a843cc45ad9cc921984dfc
SHA512 70e22e8376d9de0989853719d5fd8ca1eaebf1a5a828f8875e63f45c3f68bcdde2a2f8a57ac2c3a285cad9b4139b98cc4544ebf527c4aaf84bcbfb23aa9326d5
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h22:VLy2Kerc64CiGImVucp4kojWh22
TLSH
T13E334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/5328-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000a00000001b312-5.dat	family_juko
behavioral2/memory/5328-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1800-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c487-13.dat	family_juko
behavioral2/memory/1256-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1256-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1800	WINWORD.exe
1256	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

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	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	2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.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
4620	cmd.exe
5368	PING.EXE
4104	PING.EXE
4948	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5368	PING.EXE
4104	PING.EXE
4948	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5328 wrote to memory of 1800	5328	2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe	87
PID 1800 wrote to memory of 4620	1800	WINWORD.exe	88
PID 4620 wrote to memory of 5368	4620	cmd.exe	90
PID 4620 wrote to memory of 4104	4620	cmd.exe	91
PID 4620 wrote to memory of 4948	4620	cmd.exe	92
PID 4620 wrote to memory of 1256	4620	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5328
- 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:1800
- - 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\000040BB" 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:4620
  - - 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:5368
  - - 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:4104
  - - 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:4948
  - - 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:1256

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

000040BB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040BB
Size 49KB
SHA256 48de8a782a4af0348c6921fe8bb33c2dcdf76c9c140e7d111273aaaf24809b8d
MD5 99930a846c6e11e5c7ecc6980d5f997a
SHA1 e77dc94c41677b0c80c405ed8ad323f6ee7968a0
SHA512 53f03bb52b8667fb0d89e3b7e72b94d59e4825c014a85f5ae020ee68e093f5eca83fd82dc602e285784cc0a67d50477fc51d13465094b6114330625b9bcc4d29
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2D:VLy2Kerc64CiGImVucp4kojWh2D
TLSH
T194334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5e6f0e6cdf549c3fb082a6d89539860fca0cdb7e3ea0212e4482bdc76f5ff1db
MD5 2a1d622f7eccc8e53353bf5ec0c8acbd
SHA1 cad6c38bf88f3f3201a843cc45ad9cc921984dfc
SHA512 70e22e8376d9de0989853719d5fd8ca1eaebf1a5a828f8875e63f45c3f68bcdde2a2f8a57ac2c3a285cad9b4139b98cc4544ebf527c4aaf84bcbfb23aa9326d5
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h22:VLy2Kerc64CiGImVucp4kojWh22
TLSH
T13E334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1256-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1256-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1800-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5328-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5328-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads