juko | 7f792cb9dfa8d239cd3b51b8bd8a54da41c40dc598d113cf4413930c26389a7b

General

Target
2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe
Size 59KB
Sample261026-repdfas19p
SHA256 7f792cb9dfa8d239cd3b51b8bd8a54da41c40dc598d113cf4413930c26389a7b
MD5 bd0d4bada1437924a211b0e788e65151
SHA1 9970439e95db7aa1dcd163c23d92f22528132766
SHA512 73a9d70b5a15d6069ab90c54f784c3d42e6d2ec570505972fce15df1c227a674fcbab7ea7acccfaaec897c19f1c325631472c87c0d27727800fdb9b53e935d87
SSDEEP 768:ZZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpg:jLsF2Kerc64sTiX2IV0Dhug
TLSH
T17A53268D5B85C880DE805A790E5A25EA0CBD6E96EF3A73D187063BC4367354A63FF4C4
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/0x001e0000000242ea-3.dat	family_juko
behavioral1/files/0x00090000000243dd-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-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4436	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-1-5-21-2101206053-1414382737-268919432-1000\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
1944	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	2026-10-25_bd0d4bada1437924a211b0e788e65151_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1944	cmd.exe
1732	PING.EXE
4784	PING.EXE
5108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1732	PING.EXE
4784	PING.EXE
5108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4276 wrote to memory of 4436	4276	2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe	85
PID 4436 wrote to memory of 1944	4436	WINWORD.exe	86
PID 1944 wrote to memory of 1732	1944	cmd.exe	88
PID 1944 wrote to memory of 4784	1944	cmd.exe	89
PID 1944 wrote to memory of 5108	1944	cmd.exe	92
PID 1944 wrote to memory of 1036	1944	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4276
- 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:4436
- - 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\00004883" 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:1944
  - - 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:1732
  - - 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:4784
  - - 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:5108
  - - 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

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

Replay Monitor

Loading Replay Monitor...

Downloads

00004883

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004883
Size 59KB
SHA256 161f270522e1f4ce077593a7f044788828c01d4e7fef862f348388fc320d27db
MD5 0455df096b1fb795d8a6c2f16d6fd8df
SHA1 17201342f00f6198444ea026baa84bc53d101b26
SHA512 d57895802bc104c31d444334948aed8ec3fe551cda4c1da63530a632c48ebb61af46a677038b18b6a6e192f594ae2a01ce10288e16f13f1fed20c48a587e9384
SSDEEP 768:ZZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpW:jLsF2Kerc64sTiX2IV0DhuW
TLSH
T14B53268D5B85C880DE805A790E5A25EA0CBD6E96EF3A73D187063BC4367354A63FF4C4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 59KB
SHA256 7f792cb9dfa8d239cd3b51b8bd8a54da41c40dc598d113cf4413930c26389a7b
MD5 bd0d4bada1437924a211b0e788e65151
SHA1 9970439e95db7aa1dcd163c23d92f22528132766
SHA512 73a9d70b5a15d6069ab90c54f784c3d42e6d2ec570505972fce15df1c227a674fcbab7ea7acccfaaec897c19f1c325631472c87c0d27727800fdb9b53e935d87
SSDEEP 768:ZZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpg:jLsF2Kerc64sTiX2IV0Dhug
TLSH
T17A53268D5B85C880DE805A790E5A25EA0CBD6E96EF3A73D187063BC4367354A63FF4C4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads