juko | 66941b858a1c41375473c49bdc1fb5db641f484012fb4b38e48c1e5dd0be009e

General

Target
2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe
Size 49KB
Sample260704-e2d5rsfs7j
SHA256 66941b858a1c41375473c49bdc1fb5db641f484012fb4b38e48c1e5dd0be009e
MD5 1c5c25ec8c1a0ed4cc0147a43b748456
SHA1 212f8e9d7be2f373cff682c1fb23d91c860358a5
SHA512 772a55449bd99c0dfc66b8d9e3f9dfe36e0a472af66b124eae6714e19ea4696aee8754def38337011adc86998a2083a6a51b28cc96a20531262a8491bbcc8790
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T118334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/5168-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b0000000113a6-5.dat	family_juko
behavioral2/memory/5168-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5796-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c65a-13.dat	family_juko
behavioral2/memory/5964-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5964-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5796	WINWORD.exe
5964	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-1-5-21-1749168396-1890032557-311772428-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_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
5612	cmd.exe
5868	PING.EXE
6084	PING.EXE
7004	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5868	PING.EXE
6084	PING.EXE
7004	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5168 wrote to memory of 5796	5168	2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe	89
PID 5796 wrote to memory of 5612	5796	WINWORD.exe	90
PID 5612 wrote to memory of 5868	5612	cmd.exe	92
PID 5612 wrote to memory of 6084	5612	cmd.exe	93
PID 5612 wrote to memory of 7004	5612	cmd.exe	94
PID 5612 wrote to memory of 5964	5612	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5168
- 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:5796
- - 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\00002662" 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:5612
  - - 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:5868
  - - 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:6084
  - - 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:7004
  - - 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:5964

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

Replay Monitor

Loading Replay Monitor...

Downloads

00002662

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002662
Size 49KB
SHA256 d42f12db7db36692d14eecf6c838b186b9caa0f4a573d02fd85a8bc4b45468c7
MD5 3e42171243df810d09f4357c1396fd60
SHA1 af25c789f3f62eb064bf35530a57b81ba093a40a
SHA512 032092130910994a2a2a747f5f0b8332d3a2b7faf3546a2abf1b78006c448940cac7a10daa52fb653681ed01775b6c15eabebefad1a80ab37a6f0295a7353c61
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T1D3334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 66941b858a1c41375473c49bdc1fb5db641f484012fb4b38e48c1e5dd0be009e
MD5 1c5c25ec8c1a0ed4cc0147a43b748456
SHA1 212f8e9d7be2f373cff682c1fb23d91c860358a5
SHA512 772a55449bd99c0dfc66b8d9e3f9dfe36e0a472af66b124eae6714e19ea4696aee8754def38337011adc86998a2083a6a51b28cc96a20531262a8491bbcc8790
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T118334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5168-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5168-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5796-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5964-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5964-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads