juko | 66c53a9bc373745c528cb36e34d2f71ccc1db9379e63dcdbea9b95aefce73af4

General

Target
2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe
Size 88KB
Sample260516-jb6vbabw2y
SHA256 66c53a9bc373745c528cb36e34d2f71ccc1db9379e63dcdbea9b95aefce73af4
MD5 4ed8b5aedf0daf854f1b6cc9f7ecd85c
SHA1 03914442a40c4a952a94d5b81c7209d574a12384
SHA512 fd89f34c508398174df884e1df8a0db8e5694a97da0b893464cfe65030fa1d2afd278fafda46aed0ab6a60f7992fe26794eb41706a12f511e107cd5a3d364aa8
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T166934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x001b000000024450-4.dat	family_juko
behavioral1/files/0x0008000000024434-12.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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2132	WINWORD.exe
4804	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-1-5-21-2370214745-1838013427-2987045292-1000\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	2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_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
4176	cmd.exe
916	PING.EXE
2092	PING.EXE
1120	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
916	PING.EXE
2092	PING.EXE
1120	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 560 wrote to memory of 2132	560	2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe	89
PID 2132 wrote to memory of 4176	2132	WINWORD.exe	90
PID 4176 wrote to memory of 916	4176	cmd.exe	92
PID 4176 wrote to memory of 2092	4176	cmd.exe	93
PID 4176 wrote to memory of 1120	4176	cmd.exe	94
PID 4176 wrote to memory of 4804	4176	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_4ed8b5aedf0daf854f1b6cc9f7ecd85c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:560
- 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:2132
- - 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\00007CF8" 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:4176
  - - 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:916
  - - 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:2092
  - - 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:1120
  - - 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:4804

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

00007CF8

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007CF8
Size 88KB
SHA256 d090bec329c51f29dee6ed790236b3ed5efafdc87af0deda40a5324a1dce8c7e
MD5 9fbbe946b63ec486c0b47572033aa110
SHA1 d300dad7c29173ee060fe166e321744c02bb6e1c
SHA512 44be33e280925d2b2ed1bc3e74b086791c4e7fd3e02325fe31e8f7a2d73007b3411dfe3a404b1f5a36d632dff451de6ba527654a494e8569e420ca0eb0368ef9
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193u
TLSH
T152934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 66c53a9bc373745c528cb36e34d2f71ccc1db9379e63dcdbea9b95aefce73af4
MD5 4ed8b5aedf0daf854f1b6cc9f7ecd85c
SHA1 03914442a40c4a952a94d5b81c7209d574a12384
SHA512 fd89f34c508398174df884e1df8a0db8e5694a97da0b893464cfe65030fa1d2afd278fafda46aed0ab6a60f7992fe26794eb41706a12f511e107cd5a3d364aa8
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T166934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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