juko | ef956f90ff1a701c0c537deb0ed8c34e4940f5b945af0c96e67915f3a395f54f

General

Target
2026-07-11_b1084e3069ffb18a86112ea2ad6d6285_elex_wannacry.exe
Size 49KB
Sample260711-ps26cact6z
SHA256 ef956f90ff1a701c0c537deb0ed8c34e4940f5b945af0c96e67915f3a395f54f
MD5 b1084e3069ffb18a86112ea2ad6d6285
SHA1 b165f33299b987355a8223a71da9b568c5c9d238
SHA512 73f70e3c1d13daa37ceca07b20d0db3542146aa3731cac0c1992ecb551487aee11291bcc311d7f49dc3ead7d4b93a56ce6a15fe8a90e1fe33b74509ccdbfff11
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T17C334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/5052-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/5052-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3856-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b9-13.dat	family_juko
behavioral2/memory/3680-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3680-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3856	WINWORD.exe
3680	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-1-5-21-3797332335-34111092-3597280141-1000\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	2026-07-11_b1084e3069ffb18a86112ea2ad6d6285_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
3136	PING.EXE
4128	PING.EXE
4480	cmd.exe
2448	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3136	PING.EXE
4128	PING.EXE
2448	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5052 wrote to memory of 3856	5052	2026-07-11_b1084e3069ffb18a86112ea2ad6d6285_elex_wannacry.exe	87
PID 3856 wrote to memory of 4480	3856	WINWORD.exe	88
PID 4480 wrote to memory of 2448	4480	cmd.exe	90
PID 4480 wrote to memory of 3136	4480	cmd.exe	91
PID 4480 wrote to memory of 4128	4480	cmd.exe	92
PID 4480 wrote to memory of 3680	4480	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-11_b1084e3069ffb18a86112ea2ad6d6285_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-11_b1084e3069ffb18a86112ea2ad6d6285_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5052
- 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:3856
- - 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\000079E6" 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:4480
  - - 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:2448
  - - 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:3136
  - - 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:4128
  - - 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:3680

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

000079E6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000079E6
Size 49KB
SHA256 6873bbbc054568f64a74a8147563c1cd2ac26ca72d63b47f161ed6ed23bb0196
MD5 5494e388522ce4c570462b9548892568
SHA1 94909a3511e6a6a230e83be6d77129e515c5983c
SHA512 afd17f4cb31f8654f4a047c7a092abc8745ca21fe5628d1ac5002eb1fa47cccb701e157ef3893b1f97ce738db84cf77127dae37bf2ecfbf9b2b5f667463d28cd
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2U:VLy2Kerc64CiGImVucp4kojWh2U
TLSH
T1F4334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 ef956f90ff1a701c0c537deb0ed8c34e4940f5b945af0c96e67915f3a395f54f
MD5 b1084e3069ffb18a86112ea2ad6d6285
SHA1 b165f33299b987355a8223a71da9b568c5c9d238
SHA512 73f70e3c1d13daa37ceca07b20d0db3542146aa3731cac0c1992ecb551487aee11291bcc311d7f49dc3ead7d4b93a56ce6a15fe8a90e1fe33b74509ccdbfff11
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T17C334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3680-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3680-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3856-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5052-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5052-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads