juko | 894ac33bfe89ab371aa1ed3ed6dc44a160fef3f659c76fda1a87fab74da72a28

General

Target
2026-08-25_c71a3476cd5e1550c38004e52f90fb9b_elex_wannacry.exe
Size 53KB
Sample260826-l3vbpsbp3t
SHA256 894ac33bfe89ab371aa1ed3ed6dc44a160fef3f659c76fda1a87fab74da72a28
MD5 c71a3476cd5e1550c38004e52f90fb9b
SHA1 dd3595baeb823b764c590b9a1a5d96f1882e282f
SHA512 45859a31fc20b39fad5a512ed6c0dbe7eadfe560685a508c2f435c5d9f9ee1f73874e1b9c28fa2e4a8ee79f948b68361ea10d7c321ac6e6d57b9d9aab92f4cc1
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2s:3Ly2Kerc64CiGIm1tcBMUOOFs
TLSH
T1EC335C176A459056C0BB52B0FC894F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000e00000001c444-4.dat	family_juko
behavioral2/files/0x000e00000001c445-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2984	WINWORD.exe
5756	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-1-5-21-2246396966-3025826688-3847171515-1000\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
1432	cmd.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-25_c71a3476cd5e1550c38004e52f90fb9b_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
4752	PING.EXE
4496	PING.EXE
1440	PING.EXE
1432	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4752	PING.EXE
4496	PING.EXE
1440	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 2984	3052	2026-08-25_c71a3476cd5e1550c38004e52f90fb9b_elex_wannacry.exe	89
PID 2984 wrote to memory of 1432	2984	WINWORD.exe	90
PID 1432 wrote to memory of 4752	1432	cmd.exe	92
PID 1432 wrote to memory of 4496	1432	cmd.exe	93
PID 1432 wrote to memory of 1440	1432	cmd.exe	94
PID 1432 wrote to memory of 5756	1432	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-25_c71a3476cd5e1550c38004e52f90fb9b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_c71a3476cd5e1550c38004e52f90fb9b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3052
- 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:2984
- - 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\000056E5" 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:1432
  - - 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:4752
  - - 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:4496
  - - 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:1440
  - - 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:5756

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000056E5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000056E5
Size 53KB
SHA256 b75fc924a01117a22529a36b5d085f24c082206ee12751fd5b793822bea01cd0
MD5 57ba83b13f8f7eea4cccac626562dbee
SHA1 1a211490ee9757be2d88ccb4f959c9f3133beb60
SHA512 59369ee361353a856c477e63a5e2aa538e6cb1c8f48ef32817bed59e2b4f62bf068346d0bf293f096e2ce2978675008506f92ce84623005c12252c0c5b48ecf9
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2u:3Ly2Kerc64CiGIm1tcBMUOOFu
TLSH
T150335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 894ac33bfe89ab371aa1ed3ed6dc44a160fef3f659c76fda1a87fab74da72a28
MD5 c71a3476cd5e1550c38004e52f90fb9b
SHA1 dd3595baeb823b764c590b9a1a5d96f1882e282f
SHA512 45859a31fc20b39fad5a512ed6c0dbe7eadfe560685a508c2f435c5d9f9ee1f73874e1b9c28fa2e4a8ee79f948b68361ea10d7c321ac6e6d57b9d9aab92f4cc1
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2s:3Ly2Kerc64CiGIm1tcBMUOOFs
TLSH
T1EC335C176A459056C0BB52B0FC894F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads