juko | 165ffa5c4ceba4f9671085e33adffdd7224ab9d5fda86c50130e784f02b42b4f

General

Target
2026-10-28_5b847eb32942490451b1fbd8261cd633_elex_wannacry.exe
Size 95KB
Sample261030-ec1mgaws7j
SHA256 165ffa5c4ceba4f9671085e33adffdd7224ab9d5fda86c50130e784f02b42b4f
MD5 5b847eb32942490451b1fbd8261cd633
SHA1 56947a8b45cfd90abe51f3f65a4917166c44c919
SHA512 0438d8e3d9030e4f6c7430263638bb6182962021c5469f582d1d22015b1f90720d9b50812c45d204cecf1677f449170ca6b46a7735c1f96c1e8200c3ab8d84d0
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFN4:ELy2Kerc64CiGImqRJshIPFJRAhP2EAs
TLSH
T1C093BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
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/3292-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000600000000053e-4.dat	family_juko
behavioral2/memory/3292-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1780-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x0008000000016b3a-13.dat	family_juko
behavioral2/memory/1996-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1996-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1780	WINWORD.exe
1996	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-1-5-21-4154726816-2055034831-2297277433-1000\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
2544	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	2026-10-28_5b847eb32942490451b1fbd8261cd633_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
2544	cmd.exe
5012	PING.EXE
4552	PING.EXE
4144	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5012	PING.EXE
4552	PING.EXE
4144	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3292 wrote to memory of 1780	3292	2026-10-28_5b847eb32942490451b1fbd8261cd633_elex_wannacry.exe	89
PID 1780 wrote to memory of 2544	1780	WINWORD.exe	90
PID 2544 wrote to memory of 5012	2544	cmd.exe	92
PID 2544 wrote to memory of 4552	2544	cmd.exe	93
PID 2544 wrote to memory of 4144	2544	cmd.exe	94
PID 2544 wrote to memory of 1996	2544	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-28_5b847eb32942490451b1fbd8261cd633_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_5b847eb32942490451b1fbd8261cd633_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3292
- 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:1780
- - 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\00001F37" 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:2544
  - - 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:5012
  - - 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:4552
  - - 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:4144
  - - 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:1996

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

00001F37

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001F37
Size 95KB
SHA256 ff4d19a855f45c564179f9c5465ec981b9219ecc3809be17076572f17f172c66
MD5 a5d2a1f5a024f341f6073b53292ab855
SHA1 fdef76998991d80e1d35068d8043ec7912599666
SHA512 5ce3796b9badc4883fa677ce943b4989df7eb91729b7705f809862f3c243aeaccdda1b1fe3addca9da6efc0e0b27696e92ff9de5047806dcb92b302b24dfaf82
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNf:ELy2Kerc64CiGImqRJshIPFJRAhP2EAz
TLSH
T11A93BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 165ffa5c4ceba4f9671085e33adffdd7224ab9d5fda86c50130e784f02b42b4f
MD5 5b847eb32942490451b1fbd8261cd633
SHA1 56947a8b45cfd90abe51f3f65a4917166c44c919
SHA512 0438d8e3d9030e4f6c7430263638bb6182962021c5469f582d1d22015b1f90720d9b50812c45d204cecf1677f449170ca6b46a7735c1f96c1e8200c3ab8d84d0
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFN4:ELy2Kerc64CiGImqRJshIPFJRAhP2EAs
TLSH
T1C093BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1780-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1996-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1996-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3292-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3292-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads