juko | 3edf6f14fe4349d7497e1da6587ba9cf82e655071a081dd2852d3ea7394e74a4

General

Target
2026-05-07_e7c5a141591d8949c56f8680b74a29dc_elex_wannacry.exe
Size 32KB
Sample260507-derxnset5t
SHA256 3edf6f14fe4349d7497e1da6587ba9cf82e655071a081dd2852d3ea7394e74a4
MD5 e7c5a141591d8949c56f8680b74a29dc
SHA1 2b77bd043647a1a5dffbdda501f5e17c880e590b
SHA512 9052b5ad1ae4bc59378f2f18785a1402ed1b92c0b523d93439aaceda0709d1ded0c790f84935d11f26fa62621a91a44ab84bbe25a67e4d8d12c29f2eb77bf095
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7a:ZLsF2Kerc64sTiX2IV0DKy7a
TLSH
T1FEE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x000c00000001eeff-4.dat	family_juko
behavioral1/files/0x000800000002435c-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-07_e7c5a141591d8949c56f8680b74a29dc_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2064	WINWORD.exe
1020	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-05-07_e7c5a141591d8949c56f8680b74a29dc_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
5412	cmd.exe
5272	PING.EXE
1160	PING.EXE
2232	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5272	PING.EXE
1160	PING.EXE
2232	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4884 wrote to memory of 2064	4884	2026-05-07_e7c5a141591d8949c56f8680b74a29dc_elex_wannacry.exe	84
PID 2064 wrote to memory of 5412	2064	WINWORD.exe	85
PID 5412 wrote to memory of 5272	5412	cmd.exe	87
PID 5412 wrote to memory of 1160	5412	cmd.exe	89
PID 5412 wrote to memory of 2232	5412	cmd.exe	91
PID 5412 wrote to memory of 1020	5412	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-05-07_e7c5a141591d8949c56f8680b74a29dc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_e7c5a141591d8949c56f8680b74a29dc_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4884
- 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:2064
- - 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\00006A82" 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:5412
  - - 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:5272
  - - 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:1160
  - - 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:2232
  - - 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:1020

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

00006A82

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006A82
Size 32KB
SHA256 4fc884346de69c43cc9de9f59997f1b6a33ff77803cfcee094ada4db5b85bd8b
MD5 f7decf37eca653e0ee06295b6e52660e
SHA1 26a59345cf00c9d056acf47bf5bbaa2d1eb68c0e
SHA512 d6c6a3476d88a3647b1af24509b7d9aeec8ca02aa0fb8defa1e16d9f2a27ec6666cd2bc5c2caac36f0a5fe51dd9315f4b55e55e6ff53831e16c38c205cdf37ea
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7v:ZLsF2Kerc64sTiX2IV0DKy7v
TLSH
T12DE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 3edf6f14fe4349d7497e1da6587ba9cf82e655071a081dd2852d3ea7394e74a4
MD5 e7c5a141591d8949c56f8680b74a29dc
SHA1 2b77bd043647a1a5dffbdda501f5e17c880e590b
SHA512 9052b5ad1ae4bc59378f2f18785a1402ed1b92c0b523d93439aaceda0709d1ded0c790f84935d11f26fa62621a91a44ab84bbe25a67e4d8d12c29f2eb77bf095
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7a:ZLsF2Kerc64sTiX2IV0DKy7a
TLSH
T1FEE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1020-16-0x0000000002BC0000-0x0000000002C56000-memory.dmp

Download

memory/1020-18-0x0000000002BC0000-0x0000000002C56000-memory.dmp

Download

memory/2064-13-0x0000000002420000-0x00000000024B6000-memory.dmp

Download

memory/4884-11-0x0000000002030000-0x00000000020C6000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads