juko | fb7d1e2f7dc46d406f0eb7da236f925d198101924e8c4a7602e66a215537c2db

General

Target
2026-06-28_35e25ec90183afd920601db299c2f8c9_elex_wannacry.exe
Size 49KB
Sample260628-3dch2ag18r
SHA256 fb7d1e2f7dc46d406f0eb7da236f925d198101924e8c4a7602e66a215537c2db
MD5 35e25ec90183afd920601db299c2f8c9
SHA1 beacb2c77b244f7cf61c952ab8cf4aa8b98377d1
SHA512 b7fc15960e6283eedf2561bc24c0a40d4e96bad732268ff87c05ee771438725c1ff20df050193a2166cd5e17d0e9b44295822f002c2c078c0170f271a7527151
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2z:VLy2Kerc64CiGImVucp4kojWh2z
TLSH
T184334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/3508-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c000000019ca7-5.dat	family_juko
behavioral2/memory/3508-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4708-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4d0-13.dat	family_juko
behavioral2/memory/3404-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3404-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4708	WINWORD.exe
3404	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-1-5-21-28459746-3881314244-166055492-1000\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	2026-06-28_35e25ec90183afd920601db299c2f8c9_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
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
2344	cmd.exe
2076	PING.EXE
4636	PING.EXE
5384	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2076	PING.EXE
4636	PING.EXE
5384	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3508 wrote to memory of 4708	3508	2026-06-28_35e25ec90183afd920601db299c2f8c9_elex_wannacry.exe	89
PID 4708 wrote to memory of 2344	4708	WINWORD.exe	90
PID 2344 wrote to memory of 2076	2344	cmd.exe	92
PID 2344 wrote to memory of 4636	2344	cmd.exe	93
PID 2344 wrote to memory of 5384	2344	cmd.exe	94
PID 2344 wrote to memory of 3404	2344	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-28_35e25ec90183afd920601db299c2f8c9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-28_35e25ec90183afd920601db299c2f8c9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3508
- 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:4708
- - 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\000032DD" 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:2344
  - - 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:4636
  - - 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:5384
  - - 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:3404

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

000032DD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000032DD
Size 49KB
SHA256 0acf9df4be782bd4678d31e5d7828348944ca84a8751357af2ed520b5d1401be
MD5 6b4a787540fd357961ed86911c74fd23
SHA1 a110b282f85bafaa4158447a78959e358ce17b29
SHA512 0e0182d41242e0bec3e4e4f2ba290c575bc52d0ecf8d4c272fe51441458906c1ba028dd40365ea0752074d2d2b27acad2a91231771d47aa0ab56c245863b8bda
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2O:VLy2Kerc64CiGImVucp4kojWh2O
TLSH
T1E5334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 fb7d1e2f7dc46d406f0eb7da236f925d198101924e8c4a7602e66a215537c2db
MD5 35e25ec90183afd920601db299c2f8c9
SHA1 beacb2c77b244f7cf61c952ab8cf4aa8b98377d1
SHA512 b7fc15960e6283eedf2561bc24c0a40d4e96bad732268ff87c05ee771438725c1ff20df050193a2166cd5e17d0e9b44295822f002c2c078c0170f271a7527151
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2z:VLy2Kerc64CiGImVucp4kojWh2z
TLSH
T184334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3404-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3404-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3508-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3508-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4708-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads