juko | 9e0760e2b0f856c8ce9465796c15dc71974942f12491ded9ab62f6e4221417a4

General

Target
2026-05-05_cd189b0fdb9b10122f252b7a5b44bc71_elex_wannacry.exe
Size 32KB
Sample260505-mjfvmsgv7m
SHA256 9e0760e2b0f856c8ce9465796c15dc71974942f12491ded9ab62f6e4221417a4
MD5 cd189b0fdb9b10122f252b7a5b44bc71
SHA1 4494d34497a856daf896bd6b8209ec7a2cd83355
SHA512 50e7af70ca7167399222881ba05e0c5130fc79362b02f3f128365bd3ce9fa1d5d8f7b38f2fbe965d90a59b4c2d9ccbcdc3207e87eee9bfd106c504a123156d5e
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7f:ZLsF2Kerc64sTiX2IV0DKy7f
TLSH
T1D3E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x00060000000231a5-4.dat	family_juko
behavioral1/files/0x00080000000244cd-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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-05-05_cd189b0fdb9b10122f252b7a5b44bc71_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
6124	WINWORD.exe
5000	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-1-5-21-721190819-434563495-2007910846-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-05_cd189b0fdb9b10122f252b7a5b44bc71_elex_wannacry.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
4696	cmd.exe
4764	PING.EXE
2276	PING.EXE
4824	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2276	PING.EXE
4824	PING.EXE
4764	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4756 wrote to memory of 6124	4756	2026-05-05_cd189b0fdb9b10122f252b7a5b44bc71_elex_wannacry.exe	84
PID 6124 wrote to memory of 4696	6124	WINWORD.exe	85
PID 4696 wrote to memory of 4764	4696	cmd.exe	87
PID 4696 wrote to memory of 2276	4696	cmd.exe	88
PID 4696 wrote to memory of 4824	4696	cmd.exe	89
PID 4696 wrote to memory of 5000	4696	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-05-05_cd189b0fdb9b10122f252b7a5b44bc71_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_cd189b0fdb9b10122f252b7a5b44bc71_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4756
- 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:6124
- - 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\000004F1" 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:4696
  - - 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:4764
  - - 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:2276
  - - 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:4824
  - - 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:5000

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

000004F1

Path C:\Users\Admin\AppData\Roaming\Mozilla\000004F1
Size 32KB
SHA256 4bd183cde6f91e87b555248cfc5c4a597d1d32700add276405ccd9f337395d90
MD5 4963c09b10c4b9e12fe1ec20a0757131
SHA1 df2ae854e62f92df871f5d9fcea0864dfa844e28
SHA512 3ac87268529982743c902a2c831cb317527b2fd6cd0e0f853834086a01a1b7f2cd20ce73108179557b2c1c2eb97bb0149ad8a73770455ce0102e5cc9517ac66e
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7F:ZLsF2Kerc64sTiX2IV0DKy7F
TLSH
T1ABE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 9e0760e2b0f856c8ce9465796c15dc71974942f12491ded9ab62f6e4221417a4
MD5 cd189b0fdb9b10122f252b7a5b44bc71
SHA1 4494d34497a856daf896bd6b8209ec7a2cd83355
SHA512 50e7af70ca7167399222881ba05e0c5130fc79362b02f3f128365bd3ce9fa1d5d8f7b38f2fbe965d90a59b4c2d9ccbcdc3207e87eee9bfd106c504a123156d5e
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7f:ZLsF2Kerc64sTiX2IV0DKy7f
TLSH
T1D3E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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