juko | 412fa3a877f00b03a1152030193a866227e560236f8fa89ebbde4d745109ce4b

General

Target
2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe
Size 50KB
Sample260415-rf4jragv9n
SHA256 412fa3a877f00b03a1152030193a866227e560236f8fa89ebbde4d745109ce4b
MD5 39f71136e77c2457aec1556566c46820
SHA1 0ac671a263f3e8aab131bd68fc907316e7dd0955
SHA512 c66241f0f253c7149db3b4df3824168ebd6061e45ba0d24635048102809dd20b6d0c8a027e41486eb3a109aef7f3d97630524688ad6da9209ff74a475550d9e9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOE:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOE
TLSH
T14A33281A3B45E1D1C49361B0EC574F74983AEDB58E276103BB85B70D2CB2A52CF7298E
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/0x009900000001b598-4.dat	family_juko
behavioral1/files/0x0009000000024276-14.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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2444	WINWORD.exe
3816	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-1-5-21-2714754311-527593155-1440850301-1000\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	2026-04-15_39f71136e77c2457aec1556566c46820_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
2396	PING.EXE
2052	PING.EXE
1476	cmd.exe
4700	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4700	PING.EXE
2396	PING.EXE
2052	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4084 wrote to memory of 2444	4084	2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe	83
PID 2444 wrote to memory of 1476	2444	WINWORD.exe	84
PID 1476 wrote to memory of 4700	1476	cmd.exe	86
PID 1476 wrote to memory of 2396	1476	cmd.exe	87
PID 1476 wrote to memory of 2052	1476	cmd.exe	88
PID 1476 wrote to memory of 3816	1476	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4084
- 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:2444
- - 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\000040EF" 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:1476
  - - 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:4700
  - - 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:2396
  - - 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:2052
  - - 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:3816

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

000040EF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040EF
Size 50KB
SHA256 cea5b54c35f42d6cf3d5e86c91c45f120869c85217be4e481a484697d21a788f
MD5 66c7046621086ca9ea996b153a4ebdd4
SHA1 115e8eb97b78f61e0f1ac9dac6c4c4cfea189966
SHA512 581e66f31a6fe92531e0fe85c46077a15243fefe293649d8f7e1ba612cc483a91bbd5a3fe87f9e4fae8bfb2e0895e6b563d26ad01aa2416e52c9566f5f5a0c94
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOY:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOY
TLSH
T13633281A3B45E1D1C49361B0EC574F74983AECB58E276103BB85B70D2CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 412fa3a877f00b03a1152030193a866227e560236f8fa89ebbde4d745109ce4b
MD5 39f71136e77c2457aec1556566c46820
SHA1 0ac671a263f3e8aab131bd68fc907316e7dd0955
SHA512 c66241f0f253c7149db3b4df3824168ebd6061e45ba0d24635048102809dd20b6d0c8a027e41486eb3a109aef7f3d97630524688ad6da9209ff74a475550d9e9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOE:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOE
TLSH
T14A33281A3B45E1D1C49361B0EC574F74983AEDB58E276103BB85B70D2CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2444-13-0x0000000000420000-0x0000000000426000-memory.dmp

Download

memory/3816-16-0x0000000000530000-0x0000000000536000-memory.dmp

Download

memory/3816-17-0x0000000002A60000-0x0000000002A67000-memory.dmp

Download

memory/4084-10-0x0000000000420000-0x0000000000426000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads