juko | 145ca5de8948f8b39bbea5a490a2642e4041b7b13ff11675e896ca8793ff0251

General

Target
2026-05-05_731e490874823e668d5f6ab8ae590740_elex_wannacry.exe
Size 87KB
Sample260505-yeb7faax2n
SHA256 145ca5de8948f8b39bbea5a490a2642e4041b7b13ff11675e896ca8793ff0251
MD5 731e490874823e668d5f6ab8ae590740
SHA1 234d3caa88d4cd8dcc6bf68670d02e82d67a5310
SHA512 16e47a335ef75734a04ac9426508273f294f1f3df588671071fba2038bb044be0290cb57a1c6f5d369d28b78405a076aef34fd11afdaf4c2dc9c10d054c31acb
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp4:2Ly2Kerc64CiGIm1K851YO6EQkwp4
TLSH
T14193A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 8 IoCs

resource	yara_rule
behavioral1/memory/5012-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b000000024328-5.dat	family_juko
behavioral1/memory/4860-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/5012-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4860-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00080000000244db-16.dat	family_juko
behavioral1/memory/2980-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2980-19-0x0000000000400000-0x0000000000425000-memory.dmp	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	2026-05-05_731e490874823e668d5f6ab8ae590740_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
4860	WINWORD.exe
2980	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-05_731e490874823e668d5f6ab8ae590740_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

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
3920	PING.EXE
2928	cmd.exe
4588	PING.EXE
1132	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4588	PING.EXE
1132	PING.EXE
3920	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5012 wrote to memory of 4860	5012	2026-05-05_731e490874823e668d5f6ab8ae590740_elex_wannacry.exe	85
PID 4860 wrote to memory of 2928	4860	WINWORD.exe	86
PID 2928 wrote to memory of 4588	2928	cmd.exe	88
PID 2928 wrote to memory of 1132	2928	cmd.exe	89
PID 2928 wrote to memory of 3920	2928	cmd.exe	90
PID 2928 wrote to memory of 2980	2928	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-05_731e490874823e668d5f6ab8ae590740_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_731e490874823e668d5f6ab8ae590740_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5012
- 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:4860
- - 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\000028C8" 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:2928
  - - 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:4588
  - - 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:1132
  - - 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:3920
  - - 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:2980

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

000028C8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000028C8
Size 87KB
SHA256 4922cc90153f5151e6b59c35ad72b0fb2a00d95c4c84cd4228500e999302acd7
MD5 83ce8cd7f1a7d170e5a83ebfa21e7db8
SHA1 56068e12b6626ff979fe4860289b144397462075
SHA512 be988c5f02f2406b8d17734322659ed711e3764595ef5fe39d57daa800fdf1d5c1b7cfd3a93aab1b227a30fbe2d956297fcdc8ed23b238683ebb3df733b7d882
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpt:2Ly2Kerc64CiGIm1K851YO6EQkwpt
TLSH
T10393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 145ca5de8948f8b39bbea5a490a2642e4041b7b13ff11675e896ca8793ff0251
MD5 731e490874823e668d5f6ab8ae590740
SHA1 234d3caa88d4cd8dcc6bf68670d02e82d67a5310
SHA512 16e47a335ef75734a04ac9426508273f294f1f3df588671071fba2038bb044be0290cb57a1c6f5d369d28b78405a076aef34fd11afdaf4c2dc9c10d054c31acb
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp4:2Ly2Kerc64CiGIm1K851YO6EQkwp4
TLSH
T14193A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2980-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2980-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4860-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4860-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5012-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5012-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads