juko | 1406ef27b082992aff37a63013fa00817b837fbe126d785f19fdc2bf5c71cf26

General

Target
2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe
Size 53KB
Sample260511-jbc71acx3w
SHA256 1406ef27b082992aff37a63013fa00817b837fbe126d785f19fdc2bf5c71cf26
MD5 385a91c809f23d4e71925272c86eca25
SHA1 c04a4dfe620addf80667e50dd2ec1dfc1a04f5f2
SHA512 def6a501a7427e7c5b37a40bf5a47875f48b88a32a274cd09c0e77682af7f6164f8921554b85e3b6d651b34219287b98a6ce6a9e197fe73b08873a034077ee47
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2q:3Ly2Kerc64CiGIm1tcBMUOOFq
TLSH
T1E3335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x002500000002b156-4.dat	family_juko
behavioral2/files/0x001e00000002b1f8-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3652	WINWORD.exe
1704	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-1-5-21-3119821332-640943685-2562343641-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.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
4660	cmd.exe
3044	PING.EXE
4272	PING.EXE
1712	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4272	PING.EXE
1712	PING.EXE
3044	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 3652	2044	2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe	79
PID 3652 wrote to memory of 4660	3652	WINWORD.exe	80
PID 4660 wrote to memory of 3044	4660	cmd.exe	82
PID 4660 wrote to memory of 4272	4660	cmd.exe	83
PID 4660 wrote to memory of 1712	4660	cmd.exe	84
PID 4660 wrote to memory of 1704	4660	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2044
- 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:3652
- - 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\00006D11" 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:4660
  - - 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:3044
  - - 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:4272
  - - 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:1712
  - - 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:1704

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

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Downloads

00006D11

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006D11
Size 53KB
SHA256 31baf23e7e21e423076b5196091e41f0bd929d6441cab775db374a5f1705f939
MD5 8fa468ba915bb2cef3246317c8ee96c9
SHA1 4717b5074553987f3056404882ab15ef1f7fc910
SHA512 ca243ff44f94f845160e5f588505c2b8f664ae80d2a9c0b1c18fd26bfc2e5c53d2fe1470210684553b5db36f4a2950dff004998c98a9d6c00c6d2dbe4b0cbc5b
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2m:3Ly2Kerc64CiGIm1tcBMUOOFm
TLSH
T10E335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 1406ef27b082992aff37a63013fa00817b837fbe126d785f19fdc2bf5c71cf26
MD5 385a91c809f23d4e71925272c86eca25
SHA1 c04a4dfe620addf80667e50dd2ec1dfc1a04f5f2
SHA512 def6a501a7427e7c5b37a40bf5a47875f48b88a32a274cd09c0e77682af7f6164f8921554b85e3b6d651b34219287b98a6ce6a9e197fe73b08873a034077ee47
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2q:3Ly2Kerc64CiGIm1tcBMUOOFq
TLSH
T1E3335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1704-16-0x0000000000980000-0x0000000000A42000-memory.dmp

Download

memory/1704-22-0x0000000000980000-0x0000000000A42000-memory.dmp

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memory/1704-28-0x0000000000980000-0x0000000000A42000-memory.dmp

Download

memory/1704-29-0x0000000000980000-0x0000000000A42000-memory.dmp

Download

memory/2044-11-0x0000000000850000-0x0000000000912000-memory.dmp

Download

memory/3652-13-0x0000000000850000-0x0000000000912000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads