juko | 8cb17428806faff62d6bcc97d65b1bcd3bb50e6047d80b71a6da15c9420cefa0

General

Target
2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe
Size 94KB
Sample260802-exdcnsvbkb
SHA256 8cb17428806faff62d6bcc97d65b1bcd3bb50e6047d80b71a6da15c9420cefa0
MD5 2f8c76ccdd3d74b08a5f5544ca55efb9
SHA1 1e40f4ff21c24f304d9596596f0540f540d95f4d
SHA512 2b3d41c0815d958e12805b9553c287b3d97b62b95256175cd88f993877d520a3751288b41ba3d00570447810b7de01ddc6f5b728feb8e50788abedf82de0c5c9
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/No:RLy2Kerc64CiGImFYgUBWTb4/No
TLSH
T142937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/5952-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b85c-5.dat	family_juko
behavioral2/memory/5952-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5716-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x0003000000000438-13.dat	family_juko
behavioral2/memory/1648-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1648-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5716	WINWORD.exe
1648	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-1-5-21-3611646547-550105268-947503007-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4112	cmd.exe

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	2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_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
3664	PING.EXE
2616	PING.EXE
5900	PING.EXE
4112	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3664	PING.EXE
2616	PING.EXE
5900	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5952 wrote to memory of 5716	5952	2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe	89
PID 5716 wrote to memory of 4112	5716	WINWORD.exe	90
PID 4112 wrote to memory of 3664	4112	cmd.exe	92
PID 4112 wrote to memory of 2616	4112	cmd.exe	93
PID 4112 wrote to memory of 5900	4112	cmd.exe	94
PID 4112 wrote to memory of 1648	4112	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5952
- 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:5716
- - 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\00005C70" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4112
  - - 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:3664
  - - 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:2616
  - - 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:5900
  - - 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:1648

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

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Downloads

00005C70

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005C70
Size 94KB
SHA256 c8dd2fcfc3b2bcbd3acd4bbc5cb11b9c5703488ca511814625c941f7e0057aaf
MD5 14bfc0cb149fb195f1061800b4bbda8d
SHA1 6e755c49a8c8c01c642d83919c1059eaa997e8a3
SHA512 1c5d04bfaf72464fd93cde388caa20ef1f9db25192c81a2267c8b2ab8a87560da7049e72d5945a40638b61f660709e0f85a6c36363f7f523f1a7d1abc6b4ae5c
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NO:RLy2Kerc64CiGImFYgUBWTb4/NO
TLSH
T1D7937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 8cb17428806faff62d6bcc97d65b1bcd3bb50e6047d80b71a6da15c9420cefa0
MD5 2f8c76ccdd3d74b08a5f5544ca55efb9
SHA1 1e40f4ff21c24f304d9596596f0540f540d95f4d
SHA512 2b3d41c0815d958e12805b9553c287b3d97b62b95256175cd88f993877d520a3751288b41ba3d00570447810b7de01ddc6f5b728feb8e50788abedf82de0c5c9
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/No:RLy2Kerc64CiGImFYgUBWTb4/No
TLSH
T142937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1648-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1648-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5716-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5952-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5952-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads