juko | fde516570524780910f1aa07f0d3a8f9f82d7410b043941b6f4a770a2693ca12

General

Target
2026-10-19_426cb6e19ff112ee1ce3c8c8a4589fc1_elex_wannacry.exe
Size 90KB
Sample261020-176ymaxy6k
SHA256 fde516570524780910f1aa07f0d3a8f9f82d7410b043941b6f4a770a2693ca12
MD5 426cb6e19ff112ee1ce3c8c8a4589fc1
SHA1 6f51f14ae3033ad95206ccfa1614300f47efafd4
SHA512 23f8dc8eb7c3332046743262b7de227853a647f7dde8bdfe4de482d43aaca224aaa44d3d6e449433e16e3460d5f4f969bff905b699280bc3f8cd78e231fbcf96
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/t:vLy2Kerc64CiGImVuX/N81rRLoPtU+3r
TLSH
T135933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
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/5504-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000600000000053e-4.dat	family_juko
behavioral2/memory/5504-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/2264-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b3a-13.dat	family_juko
behavioral2/memory/5592-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2264	WINWORD.exe
5592	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
4224	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-19_426cb6e19ff112ee1ce3c8c8a4589fc1_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
4108	PING.EXE
4224	cmd.exe
2288	PING.EXE
1404	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2288	PING.EXE
1404	PING.EXE
4108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5504 wrote to memory of 2264	5504	2026-10-19_426cb6e19ff112ee1ce3c8c8a4589fc1_elex_wannacry.exe	89
PID 2264 wrote to memory of 4224	2264	WINWORD.exe	90
PID 4224 wrote to memory of 2288	4224	cmd.exe	92
PID 4224 wrote to memory of 1404	4224	cmd.exe	93
PID 4224 wrote to memory of 4108	4224	cmd.exe	94
PID 4224 wrote to memory of 5592	4224	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-19_426cb6e19ff112ee1ce3c8c8a4589fc1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_426cb6e19ff112ee1ce3c8c8a4589fc1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5504
- 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:2264
- - 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\00004AC8" 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:4224
  - - 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:2288
  - - 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:1404
  - - 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:4108
  - - 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:5592

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

00004AC8

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004AC8
Size 90KB
SHA256 a1e33220cb1f11220543b343cfc0472d05307d2be92467a701da4e1528a0658a
MD5 5ce48f9185f64eb94958fc1c829382dd
SHA1 8dfc6f4f89e2080f88ba4422140963070d3d7051
SHA512 028ab114b3abde5a99f92cf0d8f57865379f8fd2b4c0f22602aa482d60936d16dfec769ac1643c44b496811b9559ec8198fcd3c0ef11a98b2c7f9f76810ed7d0
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/R:vLy2Kerc64CiGImVuX/N81rRLoPtU+3r
TLSH
T1F4933A1BF18A279CF6178274DAAA5A70B0BD7CB44533BC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 90KB
SHA256 fde516570524780910f1aa07f0d3a8f9f82d7410b043941b6f4a770a2693ca12
MD5 426cb6e19ff112ee1ce3c8c8a4589fc1
SHA1 6f51f14ae3033ad95206ccfa1614300f47efafd4
SHA512 23f8dc8eb7c3332046743262b7de227853a647f7dde8bdfe4de482d43aaca224aaa44d3d6e449433e16e3460d5f4f969bff905b699280bc3f8cd78e231fbcf96
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/t:vLy2Kerc64CiGImVuX/N81rRLoPtU+3r
TLSH
T135933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2264-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5504-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5504-10-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5592-16-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads