juko | e82c773d428cc494a89981bac9ef33ce11fc59e3ed3039a35b98838af22b5175

General

Target
2026-05-06_a023cbdebc4e481164cf525992f32d26_elex_wannacry.exe
Size 222KB
Sample260506-nslypacx2k
SHA256 e82c773d428cc494a89981bac9ef33ce11fc59e3ed3039a35b98838af22b5175
MD5 a023cbdebc4e481164cf525992f32d26
SHA1 e759da87f73cbf6792594a0d8bbb169c0b6933fa
SHA512 60f4a9535a7fe69bf0425ea4947bd79a941d7c5ecca21bdbe061506d087fe6e417c94d1bd2ac659578ba5ef0e9def67f79434578ffc096bb91972dbe41404f4f
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokL:WkwcERoA28wzmJje7RsHcUTL
TLSH
T1FC245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
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 6 IoCs

resource	yara_rule
behavioral2/memory/3316-0-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x000e000000027002-5.dat	family_juko
behavioral2/memory/3316-12-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/memory/3404-14-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x000400000002a78c-15.dat	family_juko
behavioral2/memory/1892-17-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3404	WINWORD.exe
1892	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-1-5-21-600123060-2148212387-2211176695-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-06_a023cbdebc4e481164cf525992f32d26_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

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
4712	PING.EXE
4264	PING.EXE
1568	PING.EXE
2912	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4712	PING.EXE
4264	PING.EXE
1568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3316 wrote to memory of 3404	3316	2026-05-06_a023cbdebc4e481164cf525992f32d26_elex_wannacry.exe	80
PID 3404 wrote to memory of 2912	3404	WINWORD.exe	81
PID 2912 wrote to memory of 1568	2912	cmd.exe	83
PID 2912 wrote to memory of 4712	2912	cmd.exe	84
PID 2912 wrote to memory of 4264	2912	cmd.exe	85
PID 2912 wrote to memory of 1892	2912	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-06_a023cbdebc4e481164cf525992f32d26_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-06_a023cbdebc4e481164cf525992f32d26_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3316
- 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:3404
- - 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\000074AC" 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:2912
  - - 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:1568
  - - 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:4712
  - - 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:4264
  - - 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:1892

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

000074AC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000074AC
Size 222KB
SHA256 ef099ddb6d65e9a55c44cac46e98f109f1ae99bc8da9095d559665d4096be788
MD5 54f99b5ab1357ccc94c576b4b47d2f10
SHA1 3349c0106f88b539037604066c157c618836b147
SHA512 dbd8badfd68f2e748d7d96333f8bae9e30a93d289c1db1dbdbde071c45bdc9eb8b4f5b0be35bd10ba4a9fda47d48d7bdaf3b4f7351fb419a84ed397c6cccbacd
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokZ:WkwcERoA28wzmJje7RsHcUTZ
TLSH
T142245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 222KB
SHA256 e82c773d428cc494a89981bac9ef33ce11fc59e3ed3039a35b98838af22b5175
MD5 a023cbdebc4e481164cf525992f32d26
SHA1 e759da87f73cbf6792594a0d8bbb169c0b6933fa
SHA512 60f4a9535a7fe69bf0425ea4947bd79a941d7c5ecca21bdbe061506d087fe6e417c94d1bd2ac659578ba5ef0e9def67f79434578ffc096bb91972dbe41404f4f
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokL:WkwcERoA28wzmJje7RsHcUTL
TLSH
T1FC245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1892-17-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3316-0-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3316-12-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3404-14-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads