juko | 3421845ba1afbfa91c810e0c9915b2338a00da9b58dbe70640503a1ba919173e

General

Target
2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe
Size 32KB
Sample260504-v3wdfacy2p
SHA256 3421845ba1afbfa91c810e0c9915b2338a00da9b58dbe70640503a1ba919173e
MD5 4a85a2cb1fdaca55cb994f34fb7d9261
SHA1 f01f6b36d7b7b8ccc70291809033da70c53729a7
SHA512 4dc491eaf49ad3083bfc42d96e489876847a275afbbb20b8f2ce3ad85deb71ce37ffe14c58ef2a5cb95f14c46704e0a0dd0ae985ba44a0b748fe95c86815c78f
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfv:tLsF2Kerc64sTiX2IV0DYQH
TLSH
T1B1E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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/0x000a000000021655-4.dat	family_juko
behavioral1/files/0x0009000000024486-14.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-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4076	WINWORD.exe
3248	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-1-5-21-643422742-1162610606-620613169-1000\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	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	2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.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
3460	PING.EXE
5056	cmd.exe
4696	PING.EXE
2816	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4696	PING.EXE
2816	PING.EXE
3460	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4524 wrote to memory of 4076	4524	2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe	85
PID 4076 wrote to memory of 5056	4076	WINWORD.exe	86
PID 5056 wrote to memory of 4696	5056	cmd.exe	88
PID 5056 wrote to memory of 2816	5056	cmd.exe	89
PID 5056 wrote to memory of 3460	5056	cmd.exe	90
PID 5056 wrote to memory of 3248	5056	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_4a85a2cb1fdaca55cb994f34fb7d9261_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4524
- 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:4076
- - 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\00002412" 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:5056
  - - 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:4696
  - - 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:2816
  - - 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:3460
  - - 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:3248

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

00002412

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002412
Size 32KB
SHA256 ce2d61a7f7369ca281a0f5cb783b7cf3baaed8d5db39e8d8ea7a7c6ca130718e
MD5 91697dad6c5cea1fe5bffd8352b41bab
SHA1 d6d953df516e1aeba7d31a027359466073cc8e10
SHA512 1ba9b863077450afb08a4d87e1ed2168bd56081fdcd4a994864e2f4a6108ed27174e8558a932b0b11f1763cb151b9cbd78f139a41921af688755cc21beb660ff
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfe:tLsF2Kerc64sTiX2IV0DYQm
TLSH
T1DBE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 3421845ba1afbfa91c810e0c9915b2338a00da9b58dbe70640503a1ba919173e
MD5 4a85a2cb1fdaca55cb994f34fb7d9261
SHA1 f01f6b36d7b7b8ccc70291809033da70c53729a7
SHA512 4dc491eaf49ad3083bfc42d96e489876847a275afbbb20b8f2ce3ad85deb71ce37ffe14c58ef2a5cb95f14c46704e0a0dd0ae985ba44a0b748fe95c86815c78f
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfv:tLsF2Kerc64sTiX2IV0DYQH
TLSH
T1B1E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3248-16-0x0000000002530000-0x000000000258F000-memory.dmp

Download

memory/4076-13-0x0000000002040000-0x000000000209F000-memory.dmp

Download

memory/4524-10-0x0000000001F50000-0x0000000001FAF000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads