juko | c04ee6d320195def994b83125325204285ab71b3ea4b89d6f6683a1bcc555e50

General

Target
2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe
Size 87KB
Sample260720-c2pkdsft8s
SHA256 c04ee6d320195def994b83125325204285ab71b3ea4b89d6f6683a1bcc555e50
MD5 ca5364d17c272bcbb1e1dbad38c54ca3
SHA1 b8b6aa886c145216a92638cad40937c502ee1de8
SHA512 359560eb4a805c8991247a4e7a353c27e35f9783427f178e2814149ef2230de522acfa19cd20ea1e9f36ce456bcfd6da6309a1ccdec9fb6d253409f23295ab2c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpu:2Ly2Kerc64CiGIm1K851YO6EQkwpu
TLSH
T10893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/2380-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b0000000242f2-5.dat	family_juko
behavioral1/memory/2380-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2192-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0009000000024571-15.dat	family_juko
behavioral1/memory/4560-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4560-18-0x0000000000400000-0x0000000000425000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2192	WINWORD.exe
4560	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-1-5-21-540052884-2969440504-464782435-1000\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
1228	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	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	2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_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

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
1228	cmd.exe
3312	PING.EXE
4736	PING.EXE
624	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
624	PING.EXE
3312	PING.EXE
4736	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 2192	2380	2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe	85
PID 2192 wrote to memory of 1228	2192	WINWORD.exe	86
PID 1228 wrote to memory of 3312	1228	cmd.exe	88
PID 1228 wrote to memory of 4736	1228	cmd.exe	89
PID 1228 wrote to memory of 624	1228	cmd.exe	90
PID 1228 wrote to memory of 4560	1228	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_ca5364d17c272bcbb1e1dbad38c54ca3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2380
- 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:2192
- - 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\00003310" 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:1228
  - - 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:3312
  - - 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:4736
  - - 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:624
  - - 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:4560

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

00003310

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003310
Size 87KB
SHA256 cd9ebfcf53eb43cd63ea1e479348d0899797610944a11ea173bbc8ac9691f117
MD5 cd257a7b7cb57192f2907d91cd733750
SHA1 334aba49f3378411179311a68917c200ab582fec
SHA512 31827c8393f1492832ca99a997d389c550b09577f27e4b5aa4e4201d615eea1362ab96d13c86e9be2c0c685ff6470e036ee91a5a4bcf6a2548e3780f2ca96c8d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpv:2Ly2Kerc64CiGIm1K851YO6EQkwpv
TLSH
T1DE93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 c04ee6d320195def994b83125325204285ab71b3ea4b89d6f6683a1bcc555e50
MD5 ca5364d17c272bcbb1e1dbad38c54ca3
SHA1 b8b6aa886c145216a92638cad40937c502ee1de8
SHA512 359560eb4a805c8991247a4e7a353c27e35f9783427f178e2814149ef2230de522acfa19cd20ea1e9f36ce456bcfd6da6309a1ccdec9fb6d253409f23295ab2c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpu:2Ly2Kerc64CiGIm1K851YO6EQkwpu
TLSH
T10893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2192-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2380-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2380-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4560-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4560-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads