juko | 66c53a9bc373745c528cb36e34d2f71ccc1db9379e63dcdbea9b95aefce73af4

General

Target
2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe
Size 88KB
Sample260516-jb6vbabw2y
SHA256 66c53a9bc373745c528cb36e34d2f71ccc1db9379e63dcdbea9b95aefce73af4
MD5 4ed8b5aedf0daf854f1b6cc9f7ecd85c
SHA1 03914442a40c4a952a94d5b81c7209d574a12384
SHA512 fd89f34c508398174df884e1df8a0db8e5694a97da0b893464cfe65030fa1d2afd278fafda46aed0ab6a60f7992fe26794eb41706a12f511e107cd5a3d364aa8
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T166934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x001f00000002b275-4.dat	family_juko
behavioral2/files/0x001b00000002b3ac-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4964	WINWORD.exe
2404	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-1-5-21-1636999435-3883760687-346127294-1000\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

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	PING.EXE
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	2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_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

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
2400	PING.EXE
2076	PING.EXE
2496	PING.EXE
2392	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2400	PING.EXE
2076	PING.EXE
2496	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1820 wrote to memory of 4964	1820	2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe	80
PID 4964 wrote to memory of 2392	4964	WINWORD.exe	81
PID 2392 wrote to memory of 2400	2392	cmd.exe	83
PID 2392 wrote to memory of 2076	2392	cmd.exe	84
PID 2392 wrote to memory of 2496	2392	cmd.exe	85
PID 2392 wrote to memory of 2404	2392	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1820
- 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:4964
- - 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\00004BBE" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2392
  - - 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:2400
  - - 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:2076
  - - 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:2496
  - - 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:2404

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00004BBE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004BBE
Size 88KB
SHA256 75885ea5a383cd405c387950af7f951542e4f037ec1b841693cb221c8d25bfc2
MD5 8f393025f557afcd6d553e2e10a9c7fe
SHA1 de044548f117bbbef866f3ed1fbe9238bef41c0f
SHA512 cd9b3e0af784a22de1ba6ad6e60f031749a3621f0366fba2636b86be5b5054a87a526c91f172098d1b13aef73f9c753664a6769750eeb776b05bcef39ce16ff2
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrc:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193U
TLSH
T19D934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 66c53a9bc373745c528cb36e34d2f71ccc1db9379e63dcdbea9b95aefce73af4
MD5 4ed8b5aedf0daf854f1b6cc9f7ecd85c
SHA1 03914442a40c4a952a94d5b81c7209d574a12384
SHA512 fd89f34c508398174df884e1df8a0db8e5694a97da0b893464cfe65030fa1d2afd278fafda46aed0ab6a60f7992fe26794eb41706a12f511e107cd5a3d364aa8
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T166934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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