juko | 26c4eb3db9afa9c95fb00356cfeccf78af2bee2a4e000456a521312b14353ea9

General

Target
2026-07-24_303f92cefed1e51264d5b45c54e4e4b1_elex_wannacry.exe
Size 49KB
Sample260724-ya8d3ssscw
SHA256 26c4eb3db9afa9c95fb00356cfeccf78af2bee2a4e000456a521312b14353ea9
MD5 303f92cefed1e51264d5b45c54e4e4b1
SHA1 5b6d3e61ebe758aebefb920ff71ab36f516d4b55
SHA512 6c2014b87bacba2dff5be9456f15663783e8155fbc21a2f3368bc2f3ec1289b612bd06e43d5d3424121c79ed62d3a3fdf82ecf8bc1e33bc23ab8938e0b869f19
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2F:VLy2Kerc64CiGImVucp4kojWh2F
TLSH
T11D334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/5716-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b853-5.dat	family_juko
behavioral2/memory/5716-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4684-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c585-13.dat	family_juko
behavioral2/memory/2528-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2528-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4684	WINWORD.exe
2528	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-1-5-21-2115213192-531537726-3295841909-1000\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
872	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	2026-07-24_303f92cefed1e51264d5b45c54e4e4b1_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
2992	PING.EXE
1400	PING.EXE
2876	PING.EXE
872	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2992	PING.EXE
1400	PING.EXE
2876	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5716 wrote to memory of 4684	5716	2026-07-24_303f92cefed1e51264d5b45c54e4e4b1_elex_wannacry.exe	89
PID 4684 wrote to memory of 872	4684	WINWORD.exe	90
PID 872 wrote to memory of 2992	872	cmd.exe	92
PID 872 wrote to memory of 1400	872	cmd.exe	93
PID 872 wrote to memory of 2876	872	cmd.exe	94
PID 872 wrote to memory of 2528	872	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-24_303f92cefed1e51264d5b45c54e4e4b1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-24_303f92cefed1e51264d5b45c54e4e4b1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5716
- 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:4684
- - 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\00004728" 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:872
  - - 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:2992
  - - 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:1400
  - - 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:2876
  - - 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:2528

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5688

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

00004728

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004728
Size 49KB
SHA256 6d03f09fe6369fcce33190f8fba9c9a428c54b6c7f4284dba92bda43177c7a38
MD5 60fbc9f7b408cf8df8331ac740c88201
SHA1 6656a8bf3e5f4aa715dcc7d331715837f820fdfd
SHA512 4fd6abdbf8b88ccf0e7f0d93f435dae21820dff61b9616b22bb15ba8a9aad00506f572d5aca1661d0b3b33c773afabafc08b5f4c2c728ebef084953bb131e596
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2D:VLy2Kerc64CiGImVucp4kojWh2D
TLSH
T175334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 26c4eb3db9afa9c95fb00356cfeccf78af2bee2a4e000456a521312b14353ea9
MD5 303f92cefed1e51264d5b45c54e4e4b1
SHA1 5b6d3e61ebe758aebefb920ff71ab36f516d4b55
SHA512 6c2014b87bacba2dff5be9456f15663783e8155fbc21a2f3368bc2f3ec1289b612bd06e43d5d3424121c79ed62d3a3fdf82ecf8bc1e33bc23ab8938e0b869f19
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2F:VLy2Kerc64CiGImVucp4kojWh2F
TLSH
T11D334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2528-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2528-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4684-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5716-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5716-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads