juko | 4d633edb41f5fabe9d1b14dd293a04e1ff1ed015b7af704e96b8e13cb49d703a

General

Target
2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe
Size 32KB
Sample260420-lp174aa16s
SHA256 4d633edb41f5fabe9d1b14dd293a04e1ff1ed015b7af704e96b8e13cb49d703a
MD5 dacb5d102ab217a3573323e96389a7e7
SHA1 05b055daf1947d3fcc78731fe4dc2297e9b62d79
SHA512 a571783179b2c59922d3006b3bccb86629a15100657a76da837bf8a477a42cedd500bce90d90139466fd9356bcee345f86da324a24ecbc488ee1600afcd3ac06
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfq:tLsF2Kerc64sTiX2IV0DYQy
TLSH
T192E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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/0x001c00000002b3c0-4.dat	family_juko
behavioral2/files/0x001b00000002b3c5-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2580	WINWORD.exe
1388	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-1-5-21-3119821332-640943685-2562343641-1000\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	2026-04-15_dacb5d102ab217a3573323e96389a7e7_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
2132	cmd.exe
5076	PING.EXE
4980	PING.EXE
4252	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5076	PING.EXE
4980	PING.EXE
4252	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 568 wrote to memory of 2580	568	2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe	79
PID 2580 wrote to memory of 2132	2580	WINWORD.exe	80
PID 2132 wrote to memory of 5076	2132	cmd.exe	82
PID 2132 wrote to memory of 4980	2132	cmd.exe	83
PID 2132 wrote to memory of 4252	2132	cmd.exe	84
PID 2132 wrote to memory of 1388	2132	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_dacb5d102ab217a3573323e96389a7e7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:568
- 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:2580
- - 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\00005266" 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:2132
  - - 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:5076
  - - 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:4980
  - - 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:4252
  - - 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:1388

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

00005266

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005266
Size 32KB
SHA256 894a57c28b57c3f7cbbc9762451ca688a48facbda3761e35355bc1aac2f92c5e
MD5 20f9efab4ad572a7b9b6bb7f22df378a
SHA1 b4d49f3922019fac89d0a5cedcfaaf5734463d18
SHA512 43bc87dc9fc19fbc45cfadd3d9d143904d62d94c8ad2980b2490c92b55e58bff996ef98437dfb7ce1c939561ae9c62a11cd0c4b93ec81740106ed26c43e43987
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfm:tLsF2Kerc64sTiX2IV0DYQu
TLSH
T13FE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 4d633edb41f5fabe9d1b14dd293a04e1ff1ed015b7af704e96b8e13cb49d703a
MD5 dacb5d102ab217a3573323e96389a7e7
SHA1 05b055daf1947d3fcc78731fe4dc2297e9b62d79
SHA512 a571783179b2c59922d3006b3bccb86629a15100657a76da837bf8a477a42cedd500bce90d90139466fd9356bcee345f86da324a24ecbc488ee1600afcd3ac06
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfq:tLsF2Kerc64sTiX2IV0DYQy
TLSH
T192E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/568-10-0x0000000000AD0000-0x0000000000B1A000-memory.dmp

Download

memory/1388-16-0x0000000000980000-0x00000000009CA000-memory.dmp

Download

memory/2580-13-0x0000000000970000-0x00000000009BA000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads