juko | 72f2df76e965a571c8fdc8bb98057d1932f4b7375af66a6d1cd8c188093cfa8a

General

Target
2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe
Size 95KB
Sample260802-ejadvssycv
SHA256 72f2df76e965a571c8fdc8bb98057d1932f4b7375af66a6d1cd8c188093cfa8a
MD5 c39c68b4626fc1b3450c8a5e7f1f9244
SHA1 dd74f6535f41ecf386cf59bbb721d71254eca28b
SHA512 902a50493272dbac79f911b08f828cd1a1f8a0dfb7fabaecb032fab4085cdbbe505b136323328935f12fafd6986d3323ff996e23783159eb2b92ee5acec7a3b0
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNX:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAr
TLSH
T1F093CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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 7 IoCs

resource	yara_rule
behavioral1/memory/456-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x0005000000023208-5.dat	family_juko
behavioral1/memory/456-11-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2676-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000a000000024540-15.dat	family_juko
behavioral1/memory/2272-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2272-18-0x0000000000400000-0x000000000042B000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_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
2676	WINWORD.exe
2272	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

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
3332	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	2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_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
4960	PING.EXE
3332	cmd.exe
4828	PING.EXE
2196	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4828	PING.EXE
2196	PING.EXE
4960	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 456 wrote to memory of 2676	456	2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe	85
PID 2676 wrote to memory of 3332	2676	WINWORD.exe	86
PID 3332 wrote to memory of 4828	3332	cmd.exe	88
PID 3332 wrote to memory of 2196	3332	cmd.exe	89
PID 3332 wrote to memory of 4960	3332	cmd.exe	90
PID 3332 wrote to memory of 2272	3332	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:456
- 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:2676
- - 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\00000278" 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:3332
  - - 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:4828
  - - 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:2196
  - - 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:4960
  - - 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:2272

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

00000278

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000278
Size 95KB
SHA256 4c53444a2afccac69ecdb373f60a5ae0c832aee2c670b22991b0c4488deacc21
MD5 e22fa51204bd645167a80fcf9c00f09f
SHA1 88fa34f7655902e66aa231df5c4a0f944d7ad252
SHA512 296ca4c2a1977a04401a364a847ec88e74d990121d38f4dba9f7cad85c835d111e85d448fef9626added2fe7575029f59d38c6c1e3527cbd9f8bf4ba532c123f
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNE:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAA
TLSH
T19993CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 72f2df76e965a571c8fdc8bb98057d1932f4b7375af66a6d1cd8c188093cfa8a
MD5 c39c68b4626fc1b3450c8a5e7f1f9244
SHA1 dd74f6535f41ecf386cf59bbb721d71254eca28b
SHA512 902a50493272dbac79f911b08f828cd1a1f8a0dfb7fabaecb032fab4085cdbbe505b136323328935f12fafd6986d3323ff996e23783159eb2b92ee5acec7a3b0
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNX:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAr
TLSH
T1F093CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/456-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/456-11-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2272-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2272-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2676-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads