juko | 245d8b91f3d43484c3aba6557bc888b81218a2f04b1f287b852380fccb595923

General

Target
2026-05-07_e0b8b8b2df3472acab6289440b49a413_elex_wannacry.exe
Size 30KB
Sample260507-ga3p6afv4v
SHA256 245d8b91f3d43484c3aba6557bc888b81218a2f04b1f287b852380fccb595923
MD5 e0b8b8b2df3472acab6289440b49a413
SHA1 de2cd826b329ad4eb28eb66f71e7609d2da9e961
SHA512 ff62d1c821335e9372f93831871812e5231d7b766a9351df21e90cdd145c0d3d769ea72245421aaba570d87c9d10f485bc45a872b38f23afe1d4cc92b116bb8b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXF:tLsF2Kerc64sTiX2IV0DzloF
TLSH
T14FE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x00120000000242b4-4.dat	family_juko
behavioral1/files/0x000b00000002435e-9.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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-05-07_e0b8b8b2df3472acab6289440b49a413_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5116	WINWORD.exe
4912	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-1-5-21-312252282-3884318443-358092420-1000\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

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	2026-05-07_e0b8b8b2df3472acab6289440b49a413_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
4880	cmd.exe
2036	PING.EXE
2612	PING.EXE
2064	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2036	PING.EXE
2612	PING.EXE
2064	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2332 wrote to memory of 5116	2332	2026-05-07_e0b8b8b2df3472acab6289440b49a413_elex_wannacry.exe	85
PID 5116 wrote to memory of 4880	5116	WINWORD.exe	86
PID 4880 wrote to memory of 2036	4880	cmd.exe	88
PID 4880 wrote to memory of 2612	4880	cmd.exe	89
PID 4880 wrote to memory of 2064	4880	cmd.exe	90
PID 4880 wrote to memory of 4912	4880	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-07_e0b8b8b2df3472acab6289440b49a413_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_e0b8b8b2df3472acab6289440b49a413_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2332
- 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:5116
- - 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\00004AE5" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4880
  - - 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:2036
  - - 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:2612
  - - 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:2064
  - - 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:4912

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00004AE5

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004AE5
Size 30KB
SHA256 cabc2939ecc1ce3d5a4b76fe4a74a69f8b19e080e7208f6c80e093fcf73ace27
MD5 7d40cf4841496d20d534281d196a18cf
SHA1 4974c6436bb22e8d870595e35b0faad3cb37023c
SHA512 4f07f83cfcaa451115a2c9885d27777a3e7c5fb82922401ce28e5dcbcc1f5637ed998d92124a026112eaf08a4ceed3d1a57777bc3284180903e3c0644c7f85f0
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXO:tLsF2Kerc64sTiX2IV0DzloO
TLSH
T188E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 245d8b91f3d43484c3aba6557bc888b81218a2f04b1f287b852380fccb595923
MD5 e0b8b8b2df3472acab6289440b49a413
SHA1 de2cd826b329ad4eb28eb66f71e7609d2da9e961
SHA512 ff62d1c821335e9372f93831871812e5231d7b766a9351df21e90cdd145c0d3d769ea72245421aaba570d87c9d10f485bc45a872b38f23afe1d4cc92b116bb8b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXF:tLsF2Kerc64sTiX2IV0DzloF
TLSH
T14FE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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