juko | c84ba61ae1a91e24a2d55b875b60cd4764abcba67916c9569fd94b94776deb23

General

Target
2026-05-23_e8640af62e6d0a5e9c22ace15fdb0a1e_elex_wannacry.exe
Size 32KB
Sample260523-2gft7aez2v
SHA256 c84ba61ae1a91e24a2d55b875b60cd4764abcba67916c9569fd94b94776deb23
MD5 e8640af62e6d0a5e9c22ace15fdb0a1e
SHA1 54a381f6eed94f1165f81ac9c8954064b2ba0b1c
SHA512 64bb835173e75259d00d59a038a6615d407cceca4a971804ed300ec5076587a6565062f6bd0c18c398a6ab0c14fcc2dbb93dfab99cb1d60fcb0366a4e5bfb3fd
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf70:ZLsF2Kerc64sTiX2IV0DKy70
TLSH
T1E9E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x001a000000024453-4.dat	family_juko
behavioral1/files/0x000a0000000243f4-12.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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-05-23_e8640af62e6d0a5e9c22ace15fdb0a1e_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1692	WINWORD.exe
4084	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-1-5-21-1074038928-2032447174-945360078-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-23_e8640af62e6d0a5e9c22ace15fdb0a1e_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

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
4932	cmd.exe
1312	PING.EXE
2628	PING.EXE
3868	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1312	PING.EXE
2628	PING.EXE
3868	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1204 wrote to memory of 1692	1204	2026-05-23_e8640af62e6d0a5e9c22ace15fdb0a1e_elex_wannacry.exe	89
PID 1692 wrote to memory of 4932	1692	WINWORD.exe	90
PID 4932 wrote to memory of 1312	4932	cmd.exe	92
PID 4932 wrote to memory of 2628	4932	cmd.exe	93
PID 4932 wrote to memory of 3868	4932	cmd.exe	96
PID 4932 wrote to memory of 4084	4932	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-05-23_e8640af62e6d0a5e9c22ace15fdb0a1e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-23_e8640af62e6d0a5e9c22ace15fdb0a1e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1204
- 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:1692
- - 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\00000637" 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:4932
  - - 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:1312
  - - 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:2628
  - - 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:3868
  - - 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:4084

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

Replay Monitor

Loading Replay Monitor...

Downloads

00000637

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000637
Size 32KB
SHA256 79ec80740a068cc08aef9e7caaeb47ee3737720a5c44cf8a65d11424cc1057f3
MD5 9074365325dc983dd3a5d9ddd762d418
SHA1 9bf7d65c295cb6c2885fdff59b8c3e0d0a4e3a04
SHA512 16f7f1dabad5ab82f4812810cca70130d03ffba497001fc3e412f42d5e60f74597e83a645b17a287a02f4fdc87374db7463ae2f0326a091cc17edb97f73f2309
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf72:ZLsF2Kerc64sTiX2IV0DKy72
TLSH
T1AAE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 c84ba61ae1a91e24a2d55b875b60cd4764abcba67916c9569fd94b94776deb23
MD5 e8640af62e6d0a5e9c22ace15fdb0a1e
SHA1 54a381f6eed94f1165f81ac9c8954064b2ba0b1c
SHA512 64bb835173e75259d00d59a038a6615d407cceca4a971804ed300ec5076587a6565062f6bd0c18c398a6ab0c14fcc2dbb93dfab99cb1d60fcb0366a4e5bfb3fd
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf70:ZLsF2Kerc64sTiX2IV0DKy70
TLSH
T1E9E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads