juko | 7a8e12ef49887a8b1ff40a04b1fbe47c25e28c47692476f696bdb5770c8df901

General

Target
2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe
Size 68KB
Sample260719-3hse2sf14j
SHA256 7a8e12ef49887a8b1ff40a04b1fbe47c25e28c47692476f696bdb5770c8df901
MD5 156e84583395b402acd57cc0d088e93d
SHA1 2ebdc95f54251b8852adcef63c7328604962c4f2
SHA512 01cacc1a6494b681999b12985f12a5fc0acab15f7408cab9f3c53853539393b5676e6cb81dc40f44f3ed050ce98f88331476f8506827f833bac9b4c2d53ff7dc
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpM:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpM
TLSH
T16363A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/3820-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x00080000000187d5-5.dat	family_juko
behavioral2/memory/3820-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3548-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001300000001c43e-13.dat	family_juko
behavioral2/memory/2456-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2456-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3548	WINWORD.exe
2456	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-1-5-21-1875162379-3804078649-638427191-1000\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
4744	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	2026-07-19_156e84583395b402acd57cc0d088e93d_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
4744	cmd.exe
4328	PING.EXE
3168	PING.EXE
3296	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3296	PING.EXE
4328	PING.EXE
3168	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3820 wrote to memory of 3548	3820	2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe	90
PID 3548 wrote to memory of 4744	3548	WINWORD.exe	91
PID 4744 wrote to memory of 4328	4744	cmd.exe	93
PID 4744 wrote to memory of 3168	4744	cmd.exe	94
PID 4744 wrote to memory of 3296	4744	cmd.exe	95
PID 4744 wrote to memory of 2456	4744	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-19_156e84583395b402acd57cc0d088e93d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3820
- 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:3548
- - 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\00000FD4" 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:4744
  - - 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:4328
  - - 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:3168
  - - 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:3296
  - - 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:2456

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:1376

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

00000FD4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000FD4
Size 68KB
SHA256 123b21b91623fe77019c481c5161fd734ab113a346548da6c956f8ae69be7bff
MD5 ce9f98a7e2c8a5ebf2e82da2c069e751
SHA1 3cbe7db0f728d3cc5f10f98def2d934676ef72ea
SHA512 4e6529eeda30feaa1717d9c191822c2858e09649c36538d7a546137ae2c0d7cc84287f76b36c5eaa08abc8c6dfd05a0a8b70886c7b1ce81bfdf77915be7c5550
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpw:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpw
TLSH
T1F863A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 7a8e12ef49887a8b1ff40a04b1fbe47c25e28c47692476f696bdb5770c8df901
MD5 156e84583395b402acd57cc0d088e93d
SHA1 2ebdc95f54251b8852adcef63c7328604962c4f2
SHA512 01cacc1a6494b681999b12985f12a5fc0acab15f7408cab9f3c53853539393b5676e6cb81dc40f44f3ed050ce98f88331476f8506827f833bac9b4c2d53ff7dc
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpM:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpM
TLSH
T16363A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2456-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2456-16-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/3548-12-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/3820-0-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/3820-9-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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