juko | a890a32494f6cbbdf4e1ae25d59913f1d6f836c7a6587e2e5ef0c8762cf6a0b3

General

Target
2026-09-04_61c8e56a3e10e090c9c97351e593f670_elex_wannacry.exe
Size 32KB
Sample260905-k4fz2a1dmc
SHA256 a890a32494f6cbbdf4e1ae25d59913f1d6f836c7a6587e2e5ef0c8762cf6a0b3
MD5 61c8e56a3e10e090c9c97351e593f670
SHA1 9e9647557abe2643375146b70b7f11f7c61d5bff
SHA512 b87c7963b4a55d997d0c8a9c6b901f6e8e5be885dc5a2cd3a6dbaa12e1a734777c1b1024630a057079514f648d278d6cdb2ad26905207e4107bfd7e402f9e415
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfI:tLsF2Kerc64sTiX2IV0DYQA
TLSH
T107E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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/0x0009000000016b4d-4.dat	family_juko
behavioral2/files/0x000f00000001c49e-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5020	WINWORD.exe
5572	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-1-5-21-552508041-2681165170-3229858294-1000\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
4540	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-04_61c8e56a3e10e090c9c97351e593f670_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

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
4540	cmd.exe
3152	PING.EXE
4700	PING.EXE
6120	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3152	PING.EXE
4700	PING.EXE
6120	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4632 wrote to memory of 5020	4632	2026-09-04_61c8e56a3e10e090c9c97351e593f670_elex_wannacry.exe	89
PID 5020 wrote to memory of 4540	5020	WINWORD.exe	90
PID 4540 wrote to memory of 3152	4540	cmd.exe	92
PID 4540 wrote to memory of 4700	4540	cmd.exe	93
PID 4540 wrote to memory of 6120	4540	cmd.exe	94
PID 4540 wrote to memory of 5572	4540	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-04_61c8e56a3e10e090c9c97351e593f670_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_61c8e56a3e10e090c9c97351e593f670_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4632
- 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:5020
- - 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\00003E19" 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:4540
  - - 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:3152
  - - 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:4700
  - - 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:6120
  - - 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:5572

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

Replay Monitor

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Downloads

00003E19

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003E19
Size 32KB
SHA256 a8a32b2570c09812d1af7a2f4c1bb924b1940f304ef7d0a61db3737187a86af9
MD5 1943014a7f581f74888c34de13697ddd
SHA1 f98d40c57f14eac3485813edc3f72f448a9578ee
SHA512 7f5bafe0047543fa98f62e3918a3fef36163e0aefce6b036e0e9f716398e2b930f3427aa9d1e9e9e53b64c016cb8af75d80e890d844015d555c39c94ae12ad80
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfj:tLsF2Kerc64sTiX2IV0DYQr
TLSH
T100E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 a890a32494f6cbbdf4e1ae25d59913f1d6f836c7a6587e2e5ef0c8762cf6a0b3
MD5 61c8e56a3e10e090c9c97351e593f670
SHA1 9e9647557abe2643375146b70b7f11f7c61d5bff
SHA512 b87c7963b4a55d997d0c8a9c6b901f6e8e5be885dc5a2cd3a6dbaa12e1a734777c1b1024630a057079514f648d278d6cdb2ad26905207e4107bfd7e402f9e415
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfI:tLsF2Kerc64sTiX2IV0DYQA
TLSH
T107E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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