juko | e5133172d433ab33119bc731f74800ec3c690f4b9712465e5740db4cb3e510a6

General

Target
2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe
Size 216KB
Sample261024-xff2cadv3p
SHA256 e5133172d433ab33119bc731f74800ec3c690f4b9712465e5740db4cb3e510a6
MD5 261ec9d6ec77ffffd86689a70da7a435
SHA1 5e5bf57c435439ae090b756d27b2c54498b39865
SHA512 bebdf666cd07c5fd8083287d6c7592adf26298342f6af0f4a9f937d758f3f1bf5de6141ccd894466e66c0f5e8c42f7fa3e166ce76f5f4f2aa9d30b425e14b863
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgV:uLy2Kwc64YIcyjIDLCSiDaQa
TLSH
T1D3240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/5016-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b893-4.dat	family_juko
behavioral2/memory/5016-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4192-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c491-13.dat	family_juko
behavioral2/memory/5896-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/5896-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4192	WINWORD.exe
5896	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-1-5-21-1262770251-41185387-1005173349-1000\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
3228	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-10-22_261ec9d6ec77ffffd86689a70da7a435_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
3488	PING.EXE
4236	PING.EXE
4196	PING.EXE
3228	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3488	PING.EXE
4236	PING.EXE
4196	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5016 wrote to memory of 4192	5016	2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe	90
PID 4192 wrote to memory of 3228	4192	WINWORD.exe	91
PID 3228 wrote to memory of 3488	3228	cmd.exe	93
PID 3228 wrote to memory of 4236	3228	cmd.exe	94
PID 3228 wrote to memory of 4196	3228	cmd.exe	95
PID 3228 wrote to memory of 5896	3228	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_261ec9d6ec77ffffd86689a70da7a435_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5016
- 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:4192
- - 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\00001EA6" 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:3228
  - - 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:3488
  - - 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:4236
  - - 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:4196
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:5896

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00001EA6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001EA6
Size 216KB
SHA256 8962401ede80441cd60cf6999e20f371ded3362481573b250385794032c58951
MD5 56374d6e3f787eea1a3a2b4cc03b340b
SHA1 0a9820686fe4389d76f66e19663e99720c650560
SHA512 2d026117f14b6b272403873d6e92d4ff4e02f1b909e479ce5dad08d716e8031cd58381a6c957a24ab36c97548c9593edb9ff72b371de42217ed5060f225ae67a
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgI:uLy2Kwc64YIcyjIDLCSiDaQn
TLSH
T17E240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 216KB
SHA256 e5133172d433ab33119bc731f74800ec3c690f4b9712465e5740db4cb3e510a6
MD5 261ec9d6ec77ffffd86689a70da7a435
SHA1 5e5bf57c435439ae090b756d27b2c54498b39865
SHA512 bebdf666cd07c5fd8083287d6c7592adf26298342f6af0f4a9f937d758f3f1bf5de6141ccd894466e66c0f5e8c42f7fa3e166ce76f5f4f2aa9d30b425e14b863
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgV:uLy2Kwc64YIcyjIDLCSiDaQa
TLSH
T1D3240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4192-12-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5016-0-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5016-9-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5896-16-0x0000000000400000-0x0000000000436000-memory.dmp

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memory/5896-17-0x0000000000400000-0x0000000000436000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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