juko | 4f3be686ae54ebc2e2997b5e807d21b3c30cebf252428daea754856217befee8

General

Target
2026-10-06_786ec228410d1d48f89288beb2ead2d0_elex_wannacry.exe
Size 67KB
Sample261006-pdhs6af18x
SHA256 4f3be686ae54ebc2e2997b5e807d21b3c30cebf252428daea754856217befee8
MD5 786ec228410d1d48f89288beb2ead2d0
SHA1 78d51f4ef2836d2f6a0f559f3b8f20bcb155d58e
SHA512 0530399173ddaea591a1fab7e975f2fa1684d12e72118b9648dbb59a0da9c0e7518a64efe889a39542dad4be37f33b9122996c3c04557324d4ebb0a9418c45c2
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQU:aLy2Kerc64CiGImRylFyp8TD
TLSH
T12A633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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 6 IoCs

resource	yara_rule
behavioral2/memory/5584-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000800000001b846-4.dat	family_juko
behavioral2/memory/5584-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2696-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c47c-13.dat	family_juko
behavioral2/memory/3660-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2696	WINWORD.exe
3660	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-1-5-21-4280978039-528710165-233981602-1000\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
1968	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	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	2026-10-06_786ec228410d1d48f89288beb2ead2d0_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

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
5936	PING.EXE
1968	cmd.exe
3920	PING.EXE
3008	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3008	PING.EXE
5936	PING.EXE
3920	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5584 wrote to memory of 2696	5584	2026-10-06_786ec228410d1d48f89288beb2ead2d0_elex_wannacry.exe	89
PID 2696 wrote to memory of 1968	2696	WINWORD.exe	90
PID 1968 wrote to memory of 3920	1968	cmd.exe	92
PID 1968 wrote to memory of 3008	1968	cmd.exe	93
PID 1968 wrote to memory of 5936	1968	cmd.exe	94
PID 1968 wrote to memory of 3660	1968	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-06_786ec228410d1d48f89288beb2ead2d0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-06_786ec228410d1d48f89288beb2ead2d0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5584
- 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:2696
- - 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\00003569" 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:1968
  - - 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:3920
  - - 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:3008
  - - 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:5936
  - - 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:3660

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

00003569

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003569
Size 67KB
SHA256 2b5d05d7d2e4ab3dae289cf5aaf6338236fc13254d0cbe7c5685273ab9da9af0
MD5 265294394b564f360dc1ae465a5f476b
SHA1 63971a9c04c8be6cff5b7dde7b4dd869fc97bad4
SHA512 c4a4cc9f1ef1c9e6e913fecf84403d9973370deb602e2709d3c99cde2be5a4f8216960158f07b571838d6f83a232b2967c1c0461281a9a512300e13786d22d53
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQi:aLy2Kerc64CiGImRylFyp8T5
TLSH
T1A0633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 4f3be686ae54ebc2e2997b5e807d21b3c30cebf252428daea754856217befee8
MD5 786ec228410d1d48f89288beb2ead2d0
SHA1 78d51f4ef2836d2f6a0f559f3b8f20bcb155d58e
SHA512 0530399173ddaea591a1fab7e975f2fa1684d12e72118b9648dbb59a0da9c0e7518a64efe889a39542dad4be37f33b9122996c3c04557324d4ebb0a9418c45c2
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQU:aLy2Kerc64CiGImRylFyp8TD
TLSH
T12A633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2696-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3660-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5584-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/5584-10-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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