juko | 773dbfb67f5575e25656b3fb52fd7b662b73431a43577962d0300aa2e343e721

General

Target
2026-05-23_9cf2b78672de9e294cc5ae35d821e95a_elex_wannacry.exe
Size 30KB
Sample260523-keregahs5x
SHA256 773dbfb67f5575e25656b3fb52fd7b662b73431a43577962d0300aa2e343e721
MD5 9cf2b78672de9e294cc5ae35d821e95a
SHA1 6fbdbe353a22dd3935fa71c3338d6b98c4acec88
SHA512 4e392040576c9c4ae9f9b34f17f02338cb7ceca0fb3b6e4f88ce82fafe76841709a8e9c1cf4db79efeb3f9d743fc1a5ce0661468f402223cfe37e0d7be1a2cb3
SSDEEP 768:HZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LO:5LsF2Kerc64sTiX2IV0DVk2LO
TLSH
T167E22A2B2AA17052C69320F0F9591F34C43E5DB5016BB0A6F7417B6928B6D63CF719CE
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
behavioral1/files/0x0008000000024231-4.dat	family_juko
behavioral1/files/0x001300000002428e-12.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-05-23_9cf2b78672de9e294cc5ae35d821e95a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2020	WINWORD.exe
2004	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-1-5-21-204488895-2999877624-296153668-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-23_9cf2b78672de9e294cc5ae35d821e95a_elex_wannacry.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
1608	cmd.exe
832	PING.EXE
3824	PING.EXE
2084	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
832	PING.EXE
3824	PING.EXE
2084	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3724 wrote to memory of 2020	3724	2026-05-23_9cf2b78672de9e294cc5ae35d821e95a_elex_wannacry.exe	90
PID 2020 wrote to memory of 1608	2020	WINWORD.exe	91
PID 1608 wrote to memory of 832	1608	cmd.exe	93
PID 1608 wrote to memory of 3824	1608	cmd.exe	94
PID 1608 wrote to memory of 2084	1608	cmd.exe	95
PID 1608 wrote to memory of 2004	1608	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-05-23_9cf2b78672de9e294cc5ae35d821e95a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-23_9cf2b78672de9e294cc5ae35d821e95a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3724
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2020
- - 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\000046FD" 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:1608
  - - 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:832
  - - 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:3824
  - - 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:2084
  - - 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:2004

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

000046FD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000046FD
Size 30KB
SHA256 67659ee830803cd6207836bad6e29f755f2297f542b7951aca1c532579f0ede4
MD5 cca3c8001a076599708db44d800863a3
SHA1 5871ba812baaa3e4712720dca8028ed1bf095823
SHA512 93b436d1d9097af4a500bd5e000cef71a0bd7e01860e61363f0f60a0f7529bf8b012af7b1af79c4cdd30936a2808eb37bb038fede6a27c26ad3d05f80fd0e1bb
SSDEEP 768:HZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2Lg:5LsF2Kerc64sTiX2IV0DVk2Lg
TLSH
T17AE22A2B2AA17052C69320F0F9591F34C43E5DB5016BB0A6F7417B6928B6D63CF719CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 773dbfb67f5575e25656b3fb52fd7b662b73431a43577962d0300aa2e343e721
MD5 9cf2b78672de9e294cc5ae35d821e95a
SHA1 6fbdbe353a22dd3935fa71c3338d6b98c4acec88
SHA512 4e392040576c9c4ae9f9b34f17f02338cb7ceca0fb3b6e4f88ce82fafe76841709a8e9c1cf4db79efeb3f9d743fc1a5ce0661468f402223cfe37e0d7be1a2cb3
SSDEEP 768:HZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LO:5LsF2Kerc64sTiX2IV0DVk2LO
TLSH
T167E22A2B2AA17052C69320F0F9591F34C43E5DB5016BB0A6F7417B6928B6D63CF719CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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