juko | 6a434c6d9e150e3a9ebd08a42fb7324bc8a5c9595b33cf47bddf91cdc1363dce

General

Target
2026-10-22_911a79e4ddebfe47e8ac35948ae46969_elex_wannacry.exe
Size 95KB
Sample261024-fdwwcafy2v
SHA256 6a434c6d9e150e3a9ebd08a42fb7324bc8a5c9595b33cf47bddf91cdc1363dce
MD5 911a79e4ddebfe47e8ac35948ae46969
SHA1 49372f5b0c4d86d84d3eb4da033b12439887ca86
SHA512 96bde491f223470000729c0635a1f0fce82cd0128937fccce5f7a9fd485295c95240c2498309d5602859a55702dac4760e4abad5a1da308716cf31684f6bb500
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNq:ELy2Kerc64CiGImqRJshIPFJRAhP2EA2
TLSH
T1B893BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
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
behavioral2/memory/3448-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000700000001b84b-4.dat	family_juko
behavioral2/memory/3448-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5100-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c578-13.dat	family_juko
behavioral2/memory/1036-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1036-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5100	WINWORD.exe
1036	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-1-5-21-560646293-820748483-2532804640-1000\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
4168	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-22_911a79e4ddebfe47e8ac35948ae46969_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
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
4372	PING.EXE
4168	cmd.exe
2472	PING.EXE
4160	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2472	PING.EXE
4160	PING.EXE
4372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3448 wrote to memory of 5100	3448	2026-10-22_911a79e4ddebfe47e8ac35948ae46969_elex_wannacry.exe	89
PID 5100 wrote to memory of 4168	5100	WINWORD.exe	90
PID 4168 wrote to memory of 2472	4168	cmd.exe	92
PID 4168 wrote to memory of 4160	4168	cmd.exe	93
PID 4168 wrote to memory of 4372	4168	cmd.exe	94
PID 4168 wrote to memory of 1036	4168	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_911a79e4ddebfe47e8ac35948ae46969_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_911a79e4ddebfe47e8ac35948ae46969_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3448
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5100
- - 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\0000599D" 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:4168
  - - 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:2472
  - - 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:4160
  - - 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:4372
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:1036

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

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000599D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000599D
Size 95KB
SHA256 48a04689ebc9222bfe02e07b27039a00bf36adea3bd9f31300507b6806f73aa6
MD5 ee6a237c0a1bc3753636482761bc6936
SHA1 1336519de72189f280ec60367808c9580b2c007e
SHA512 ba19f768c787f6b018835bb662f1389567617678f61d439728b607f53ad05497fdaa3cb51f64dd2d8a2fcccd930998e6b06bb21ea411254d1ddf54b5b3d48440
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFND:ELy2Kerc64CiGImqRJshIPFJRAhP2EA3
TLSH
T15393BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 6a434c6d9e150e3a9ebd08a42fb7324bc8a5c9595b33cf47bddf91cdc1363dce
MD5 911a79e4ddebfe47e8ac35948ae46969
SHA1 49372f5b0c4d86d84d3eb4da033b12439887ca86
SHA512 96bde491f223470000729c0635a1f0fce82cd0128937fccce5f7a9fd485295c95240c2498309d5602859a55702dac4760e4abad5a1da308716cf31684f6bb500
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNq:ELy2Kerc64CiGImqRJshIPFJRAhP2EA2
TLSH
T1B893BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1036-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1036-17-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/3448-0-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/3448-10-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/5100-12-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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