juko | 4b7d5351fc6d35c006eb7255c0160e00d6dd34fc35eb5457f140c8be5efbb421

General

Target
2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe
Size 42KB
Sample260924-psr1datfle
SHA256 4b7d5351fc6d35c006eb7255c0160e00d6dd34fc35eb5457f140c8be5efbb421
MD5 225dcc544c97322a8fc508b157ea5821
SHA1 eaf39809c482580d86b4d3a312a1bf2fa86f0635
SHA512 535ea0bf6ed3cacb1bf17999df1969b182b621900a10aac3ad609f9d519450c23c321a263bd448930a423246b16affa63d24719d51cca8e0bd873c7b811bd69a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlN:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOO3
TLSH
T16A134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
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/0x0007000000023432-4.dat	family_juko
behavioral1/files/0x000700000001e6c7-12.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-1-5-21-681733028-2344970462-962213935-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-681733028-2344970462-962213935-1000\Control Panel\International\Geo\Nation	2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
5712	WINWORD.exe
3692	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-1-5-21-681733028-2344970462-962213935-1000\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
2272	cmd.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	2026-09-23_225dcc544c97322a8fc508b157ea5821_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
5900	PING.EXE
2648	PING.EXE
5364	PING.EXE
2272	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5900	PING.EXE
2648	PING.EXE
5364	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5328 wrote to memory of 5712	5328	2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe	87
PID 5712 wrote to memory of 2272	5712	WINWORD.exe	88
PID 2272 wrote to memory of 5900	2272	cmd.exe	90
PID 2272 wrote to memory of 2648	2272	cmd.exe	91
PID 2272 wrote to memory of 5364	2272	cmd.exe	96
PID 2272 wrote to memory of 3692	2272	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5328
- 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:5712
- - 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\00003B46" 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:2272
  - - 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:5900
  - - 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:2648
  - - 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:5364
  - - 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
      System Location Discovery: System Language Discovery
      PID:3692

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003B46

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003B46
Size 42KB
SHA256 b8936f6433d46dcfd7af523df8c15ea3f5cc0a5306b9be221d678d79855ff230
MD5 892dd975f3f881c7fd2cae25187775eb
SHA1 0e8482e0469ae0176418df542b06468e1bd6079b
SHA512 2874c3fa892ec8b48c090744c3182bfce3b4e9c3c5a0e527421e9a0db6264f9a2d0bf02541e417af6f7670f5b2920063744e8fa349daaf73f460a2de1b4cdb27
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlW:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOs
TLSH
T152134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 4b7d5351fc6d35c006eb7255c0160e00d6dd34fc35eb5457f140c8be5efbb421
MD5 225dcc544c97322a8fc508b157ea5821
SHA1 eaf39809c482580d86b4d3a312a1bf2fa86f0635
SHA512 535ea0bf6ed3cacb1bf17999df1969b182b621900a10aac3ad609f9d519450c23c321a263bd448930a423246b16affa63d24719d51cca8e0bd873c7b811bd69a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlN:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOO3
TLSH
T16A134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
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