juko | 3de65b86ec248fb4550a51a1afa6127bfd24cf35b36fd0b5ab30f186b85c14ca

General

Target
2026-09-20_e85ae3dc0099313c08134d77892a994c_elex_wannacry.exe
Size 32KB
Sample260920-25fjbsvtay
SHA256 3de65b86ec248fb4550a51a1afa6127bfd24cf35b36fd0b5ab30f186b85c14ca
MD5 e85ae3dc0099313c08134d77892a994c
SHA1 e26fdc4fc0f44688ea2e3b4e73e6de8210ac9473
SHA512 83a567c8c12df14cde5a2cde59fffd41f70887c865b12dbe5073f9faf7780158ee5095829acee56aa72eb86270735944a252ab6347ace7efd7c858a13ed28881
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXls:cLsF2Kerc64sTiX2IV0DzY4kMG
TLSH
T1CAE23B2B6AA17052C59320B0F9592F35C43D9DB9016BB062F7417B6928B2D63CF71ECE
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/0x000b00000001b2e2-4.dat	family_juko
behavioral2/files/0x000e00000001c5c7-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4016	WINWORD.exe
3556	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-1-5-21-4280978039-528710165-233981602-1000\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
1656	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	2026-09-20_e85ae3dc0099313c08134d77892a994c_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
2136	PING.EXE
3376	PING.EXE
1656	cmd.exe
5716	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5716	PING.EXE
2136	PING.EXE
3376	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1652 wrote to memory of 4016	1652	2026-09-20_e85ae3dc0099313c08134d77892a994c_elex_wannacry.exe	88
PID 4016 wrote to memory of 1656	4016	WINWORD.exe	89
PID 1656 wrote to memory of 5716	1656	cmd.exe	91
PID 1656 wrote to memory of 2136	1656	cmd.exe	92
PID 1656 wrote to memory of 3376	1656	cmd.exe	93
PID 1656 wrote to memory of 3556	1656	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-09-20_e85ae3dc0099313c08134d77892a994c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-20_e85ae3dc0099313c08134d77892a994c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1652
- 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:4016
- - 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\00005049" 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:1656
  - - 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:5716
  - - 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:2136
  - - 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:3376
  - - 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:3556

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

00005049

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005049
Size 32KB
SHA256 7569edd3e2441b10914b6e83d8e8e30d664d6ed85852f59702a1817e26714199
MD5 92d2af01bce431afd90ab6b44e4cbfd5
SHA1 e5d80290a39e068e2b8c4c356199b0516a799d6b
SHA512 022ac8966821c47fbc766e4210e5c542a5f97957fb88bfdc31572e70994c3176dfb54aaab50e0f0305507973331305a876f191c58be5f8d14616d1db1f523a25
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlj:cLsF2Kerc64sTiX2IV0DzY4kMJ
TLSH
T14AE24B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 3de65b86ec248fb4550a51a1afa6127bfd24cf35b36fd0b5ab30f186b85c14ca
MD5 e85ae3dc0099313c08134d77892a994c
SHA1 e26fdc4fc0f44688ea2e3b4e73e6de8210ac9473
SHA512 83a567c8c12df14cde5a2cde59fffd41f70887c865b12dbe5073f9faf7780158ee5095829acee56aa72eb86270735944a252ab6347ace7efd7c858a13ed28881
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXls:cLsF2Kerc64sTiX2IV0DzY4kMG
TLSH
T1CAE23B2B6AA17052C59320B0F9592F35C43D9DB9016BB062F7417B6928B2D63CF71ECE
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