juko | 8a6ac5048691e41ad47c72b12c2dd1349a77d82d7a7a912a019990dcb63cfe44

General

Target
2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe
Size 95KB
Sample261027-qasdvsdf29
SHA256 8a6ac5048691e41ad47c72b12c2dd1349a77d82d7a7a912a019990dcb63cfe44
MD5 83c2a8f50f37678d55d89ef7caaf6ba3
SHA1 5cd083121537b0a9ce0f078948b0b8138b88744d
SHA512 03fdd6f42690040b003314df980c27dd23a96c549b2ef6dd5dc8fbc019fdf0774d8bb22fea03c612e0bc46d9f4956b896e5968c9d6abf6a9a66f3016aedf1725
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNy:ELy2Kerc64CiGImqRJshIPFJRAhP2EAe
TLSH
T19593BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
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 8 IoCs

resource	yara_rule
behavioral1/memory/6128-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x0006000000023237-4.dat	family_juko
behavioral1/memory/900-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/6128-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/900-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00090000000245b2-16.dat	family_juko
behavioral1/memory/2372-19-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2372-20-0x0000000000400000-0x000000000042B000-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-1-5-21-681733028-2344970462-962213935-1000\Control Panel\International\Geo\Nation	2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-681733028-2344970462-962213935-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
900	WINWORD.exe
2372	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-1-5-21-681733028-2344970462-962213935-1000\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
4964	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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	2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_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
2876	PING.EXE
5828	PING.EXE
4964	cmd.exe
3228	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3228	PING.EXE
2876	PING.EXE
5828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6128 wrote to memory of 900	6128	2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe	84
PID 900 wrote to memory of 4964	900	WINWORD.exe	85
PID 4964 wrote to memory of 3228	4964	cmd.exe	87
PID 4964 wrote to memory of 2876	4964	cmd.exe	91
PID 4964 wrote to memory of 5828	4964	cmd.exe	94
PID 4964 wrote to memory of 2372	4964	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6128
- 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:900
- - 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\000055C8" 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:4964
  - - 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:3228
  - - 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:\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:5828
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2372

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

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000055C8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000055C8
Size 95KB
SHA256 9c63735d3b3667137052370eae7fff1b6167bd096ffb8c7fc603cf3a7886f708
MD5 b6ba0c5056a210c6922506c02833a54d
SHA1 dd8e23ee3133e4198485bd372cef2d8d34de0aa9
SHA512 ae1acd7a6573d93b734b892a4078d0d82a7d499c287576817e87a38b98c56c91cc28d8b651763d78f1de7d98bfdd58264ad21d1bd187923da8a79224c602ab0f
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNo:ELy2Kerc64CiGImqRJshIPFJRAhP2EAM
TLSH
T19793BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 8a6ac5048691e41ad47c72b12c2dd1349a77d82d7a7a912a019990dcb63cfe44
MD5 83c2a8f50f37678d55d89ef7caaf6ba3
SHA1 5cd083121537b0a9ce0f078948b0b8138b88744d
SHA512 03fdd6f42690040b003314df980c27dd23a96c549b2ef6dd5dc8fbc019fdf0774d8bb22fea03c612e0bc46d9f4956b896e5968c9d6abf6a9a66f3016aedf1725
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNy:ELy2Kerc64CiGImqRJshIPFJRAhP2EAe
TLSH
T19593BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/900-12-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/900-15-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/2372-19-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/2372-20-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/6128-0-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/6128-13-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads