juko | bff920c3820c2a3151e0faa78db32194856a21a48f4d1724d18126adbd3d3a35

General

Target
2026-05-08_997b52eef8300ffd9a79d2a9126d54cd_elex_wannacry.exe
Size 32KB
Sample260508-t32d1set9r
SHA256 bff920c3820c2a3151e0faa78db32194856a21a48f4d1724d18126adbd3d3a35
MD5 997b52eef8300ffd9a79d2a9126d54cd
SHA1 7e688ab558ee0a75cea5e1d1a6f46db64f40facf
SHA512 81b6ad2da2bd903d89d8b455b324d6bdc27d83423763136d82af1a5f2a753a92f9232c7e4d4543a84c72757961ab708d8657e63fd99ae9aaa2888f3e38e2e471
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7c:ZLsF2Kerc64sTiX2IV0DKy7c
TLSH
T15DE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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
behavioral2/files/0x000800000000d3ef-5.dat	family_juko
behavioral2/files/0x001b00000002b3a6-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3452	WINWORD.exe
492	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-1-5-21-1383858298-2057492509-1726743289-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-08_997b52eef8300ffd9a79d2a9126d54cd_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
1904	PING.EXE
2036	PING.EXE
2464	PING.EXE
2744	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1904	PING.EXE
2036	PING.EXE
2464	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 692 wrote to memory of 3452	692	2026-05-08_997b52eef8300ffd9a79d2a9126d54cd_elex_wannacry.exe	80
PID 3452 wrote to memory of 2744	3452	WINWORD.exe	81
PID 2744 wrote to memory of 1904	2744	cmd.exe	83
PID 2744 wrote to memory of 2036	2744	cmd.exe	84
PID 2744 wrote to memory of 2464	2744	cmd.exe	85
PID 2744 wrote to memory of 492	2744	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-08_997b52eef8300ffd9a79d2a9126d54cd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-08_997b52eef8300ffd9a79d2a9126d54cd_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:692
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3452
- - 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\00000694" 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:2744
  - - 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:1904
  - - 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:2464
  - - 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:492

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

Replay Monitor

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Downloads

00000694

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000694
Size 32KB
SHA256 2aae098b4aa07a3ada85dc4c960d7d9b0ba21692533f60ff6fca6a369b611474
MD5 939ee252d78040c476fe4202b243e465
SHA1 accfd53f393302937d12e97084ec9809da10f9a5
SHA512 ac5efbf6db55fa5bdb8478fd8ced923ba78bfcc069779dbf90baba7a46394a2ebf864e26cda5509b2920d3b2066811a220c80ff66f74423ae1c636eca95de44d
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7w:ZLsF2Kerc64sTiX2IV0DKy7w
TLSH
T1C0E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 bff920c3820c2a3151e0faa78db32194856a21a48f4d1724d18126adbd3d3a35
MD5 997b52eef8300ffd9a79d2a9126d54cd
SHA1 7e688ab558ee0a75cea5e1d1a6f46db64f40facf
SHA512 81b6ad2da2bd903d89d8b455b324d6bdc27d83423763136d82af1a5f2a753a92f9232c7e4d4543a84c72757961ab708d8657e63fd99ae9aaa2888f3e38e2e471
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7c:ZLsF2Kerc64sTiX2IV0DKy7c
TLSH
T15DE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/692-11-0x0000000002510000-0x000000000265D000-memory.dmp

Download

memory/3452-13-0x0000000002670000-0x00000000027BD000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads