juko | e050dbf85e8c6230029010caa4f639bc9750da308d295a20d9e3f8fb7663b100

General

Target
2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe
Size 94KB
Sample260818-wlwtbaxeka
SHA256 e050dbf85e8c6230029010caa4f639bc9750da308d295a20d9e3f8fb7663b100
MD5 4d8f603bcd5328665443779348948755
SHA1 f1e14c453b0f564dac081ec59f4d8c6a7c8a43a9
SHA512 088d8f0e37ed60af5f4b0ecd7f28ee08aad77a8749a00464d3efc764c4e9e4c2c9695081d0221130bbe47485f1416db04106bb5cc1cad6676332b014562ea974
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N8:RLy2Kerc64CiGImFYgUBWTb4/N8
TLSH
T110937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 8 IoCs

resource	yara_rule
behavioral1/memory/4200-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000500000001dbd8-5.dat	family_juko
behavioral1/memory/1076-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4200-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/1076-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x0017000000024448-16.dat	family_juko
behavioral1/memory/1836-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/1836-19-0x0000000000400000-0x000000000042B000-memory.dmp	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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
1076	WINWORD.exe
1836	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-1-5-21-2370214745-1838013427-2987045292-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4556	cmd.exe

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	2026-08-18_4d8f603bcd5328665443779348948755_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
772	PING.EXE
4916	PING.EXE
4556	cmd.exe
1196	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4916	PING.EXE
1196	PING.EXE
772	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4200 wrote to memory of 1076	4200	2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe	84
PID 1076 wrote to memory of 4556	1076	WINWORD.exe	85
PID 4556 wrote to memory of 1196	4556	cmd.exe	87
PID 4556 wrote to memory of 772	4556	cmd.exe	88
PID 4556 wrote to memory of 4916	4556	cmd.exe	89
PID 4556 wrote to memory of 1836	4556	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4200
- 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:1076
- - 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\00002AD0" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4556
  - - 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:1196
  - - 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:772
  - - 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:4916
  - - 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:1836

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00002AD0

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002AD0
Size 94KB
SHA256 a6d89f1873cd047aa781801fbe9c4e9c7d1fe9727594e20c3db4bccc118085b0
MD5 b82c2232af99aa1e6e96275a5d5f68eb
SHA1 162a01d257b5475af03991f82fd3efe205f6a73e
SHA512 7be15235bf2cc7dc6fbaf833001bbb33a84360f6f029d4d69468da55271b49c3cfccc845241d169f7beaf11df2419916ff9d786750828af8980275ff4e7056d3
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NW:RLy2Kerc64CiGImFYgUBWTb4/NW
TLSH
T1B7937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 e050dbf85e8c6230029010caa4f639bc9750da308d295a20d9e3f8fb7663b100
MD5 4d8f603bcd5328665443779348948755
SHA1 f1e14c453b0f564dac081ec59f4d8c6a7c8a43a9
SHA512 088d8f0e37ed60af5f4b0ecd7f28ee08aad77a8749a00464d3efc764c4e9e4c2c9695081d0221130bbe47485f1416db04106bb5cc1cad6676332b014562ea974
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N8:RLy2Kerc64CiGImFYgUBWTb4/N8
TLSH
T110937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1076-12-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/1076-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1836-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1836-19-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4200-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4200-13-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads