juko | 683a5353b1daf078f3307f00c0106827e4525330573434db92d893ddb656945d

General

Target
2026-08-09_566ab3cca228ead5ded65c3cd226ac74_elex_wannacry.exe
Size 95KB
Sample260809-eq544stvdz
SHA256 683a5353b1daf078f3307f00c0106827e4525330573434db92d893ddb656945d
MD5 566ab3cca228ead5ded65c3cd226ac74
SHA1 09e4bfd927454057f6f96bde40f103001f346202
SHA512 4d472d4374005bad051a07f6d3b36855696675c596472cc591a35538d9607ca0b225a92f1d80d7aa25b24e972f649d17b16f771c6eafe8d12b7d0356f89d7833
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFND:JLy2Kerc64CiGIm7JrshIPFJRAhP2EA/
TLSH
T1E393CF167B986052D88A0470CA7F4F3584397C791426A213B3D27A1F2DB2A52EF73ADD
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/1524-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000c000000011377-5.dat	family_juko
behavioral2/memory/1524-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4948-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c582-13.dat	family_juko
behavioral2/memory/2840-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2840-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4948	WINWORD.exe
2840	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-1-5-21-3797332335-34111092-3597280141-1000\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
1144	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	2026-08-09_566ab3cca228ead5ded65c3cd226ac74_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
1144	cmd.exe
4164	PING.EXE
2912	PING.EXE
2352	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4164	PING.EXE
2912	PING.EXE
2352	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1524 wrote to memory of 4948	1524	2026-08-09_566ab3cca228ead5ded65c3cd226ac74_elex_wannacry.exe	89
PID 4948 wrote to memory of 1144	4948	WINWORD.exe	90
PID 1144 wrote to memory of 4164	1144	cmd.exe	92
PID 1144 wrote to memory of 2912	1144	cmd.exe	93
PID 1144 wrote to memory of 2352	1144	cmd.exe	94
PID 1144 wrote to memory of 2840	1144	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_566ab3cca228ead5ded65c3cd226ac74_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_566ab3cca228ead5ded65c3cd226ac74_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1524
- 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:4948
- - 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\0000051B" 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:1144
  - - 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:4164
  - - 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:2912
  - - 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:2352
  - - 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:2840

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

0000051B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000051B
Size 95KB
SHA256 81e0266d65e91a9dcd01c0b398be3bc3b1c2c3373768e2e8fd6b42750637aca4
MD5 3edd1ec24a96ec1599d41fb033606a70
SHA1 133314c0219300ad2ac9d8c85617b6fe54e7207f
SHA512 f13dc4b60643271095a99dff7e874d76ceb27aa00e3ab9caa1ed5639537af917d08859e3650e3c01c6732ad44def975ecbaa035b1dd92f47a3e5209f30d03aa6
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNk:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAI
TLSH
T1DB93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 683a5353b1daf078f3307f00c0106827e4525330573434db92d893ddb656945d
MD5 566ab3cca228ead5ded65c3cd226ac74
SHA1 09e4bfd927454057f6f96bde40f103001f346202
SHA512 4d472d4374005bad051a07f6d3b36855696675c596472cc591a35538d9607ca0b225a92f1d80d7aa25b24e972f649d17b16f771c6eafe8d12b7d0356f89d7833
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFND:JLy2Kerc64CiGIm7JrshIPFJRAhP2EA/
TLSH
T1E393CF167B986052D88A0470CA7F4F3584397C791426A213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1524-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1524-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2840-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2840-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4948-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads