juko | 68c8319dbdf9b06230a3f4baea41271fd4fe02014f61b6bf32b2cf44d4bb63bd

General

Target
2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe
Size 100KB
Sample261113-ptvsnavy8j
SHA256 68c8319dbdf9b06230a3f4baea41271fd4fe02014f61b6bf32b2cf44d4bb63bd
MD5 4f44528b8e609c9e5ac07134d43cfef0
SHA1 9ace0bd3cd46bb7b079e6215ecdcd1486227bafc
SHA512 682f8ae618240dc1fe320ac71a646972502fa8fbbba182defeec0ad9e5b82f7d2dfc6ca8afffd54c6a192b3a8fe1cf412d5727cc020540e19294c9c2214e0f3f
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJY:FLy2Kerc64CiGImavYBoHRBcsAUY
TLSH
T1D7A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000900000001e417-3.dat	family_juko
behavioral1/files/0x00090000000245a0-12.dat	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-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2652	WINWORD.exe
3908	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-1-5-21-747854149-4118156852-591593384-1000\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
1896	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\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.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
1896	cmd.exe
1660	PING.EXE
4612	PING.EXE
1672	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1660	PING.EXE
4612	PING.EXE
1672	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2428 wrote to memory of 2652	2428	2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe	85
PID 2652 wrote to memory of 1896	2652	WINWORD.exe	86
PID 1896 wrote to memory of 1660	1896	cmd.exe	88
PID 1896 wrote to memory of 4612	1896	cmd.exe	89
PID 1896 wrote to memory of 1672	1896	cmd.exe	92
PID 1896 wrote to memory of 3908	1896	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2428
- 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:2652
- - 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\00000226" 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:1896
  - - 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:1660
  - - 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:4612
  - - 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:1672
  - - 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:3908

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000226

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000226
Size 100KB
SHA256 fb51676c6a3a53644cdaee57e76f6bb258f1c4f200c5e0ee7888191c3bf6e16b
MD5 fd3939dc1c623c94fb0b64ac4dc5cf85
SHA1 db0729a0da1759d737cf395d996e6acdf9e2176f
SHA512 60df18a0e6feb806954617fa03c9fc2ca8e5b555d8fa30f2b3edd61419822c7859a70b00a3135919ad7dbe1d52ed02876a2c71e543b2ce4e857a705d3b3d5894
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJs:FLy2Kerc64CiGImavYBoHRBcsAUs
TLSH
T13FA3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 100KB
SHA256 68c8319dbdf9b06230a3f4baea41271fd4fe02014f61b6bf32b2cf44d4bb63bd
MD5 4f44528b8e609c9e5ac07134d43cfef0
SHA1 9ace0bd3cd46bb7b079e6215ecdcd1486227bafc
SHA512 682f8ae618240dc1fe320ac71a646972502fa8fbbba182defeec0ad9e5b82f7d2dfc6ca8afffd54c6a192b3a8fe1cf412d5727cc020540e19294c9c2214e0f3f
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJY:FLy2Kerc64CiGImavYBoHRBcsAUY
TLSH
T1D7A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads