juko | 74ae20f7461cfbe57fae7edbcd1ccc60b65f5f03123f3b7c3a3852c546f4570b

General

Target
2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.exe
Size 94KB
Sample260729-kk16vsfc74
SHA256 74ae20f7461cfbe57fae7edbcd1ccc60b65f5f03123f3b7c3a3852c546f4570b
MD5 085ae9aecc7eee309277c70fb0e08d09
SHA1 8d12ec175e63961c365beabc752ca2478c8cf68e
SHA512 f964e01f68941c6f70f7317a7555ca2a362f0566f9e3b75c18e6e43639d7b51666614c0dbb1f67302447f2e5bbe05509bb82ade46e8f1d175735b0ac4ec5e706
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ns:RLy2Kerc64CiGImFYgUBWTb4/Ns
TLSH
T1B6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/4136-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x00080000000187d5-5.dat	family_juko
behavioral2/memory/4136-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5656-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001300000001c43e-13.dat	family_juko
behavioral2/memory/5952-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5952-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5656	WINWORD.exe
5952	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-1-5-21-1875162379-3804078649-638427191-1000\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
5824	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	2026-07-29_085ae9aecc7eee309277c70fb0e08d09_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
5824	cmd.exe
2908	PING.EXE
3296	PING.EXE
2512	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2908	PING.EXE
3296	PING.EXE
2512	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4136 wrote to memory of 5656	4136	2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.exe	90
PID 5656 wrote to memory of 5824	5656	WINWORD.exe	91
PID 5824 wrote to memory of 2908	5824	cmd.exe	93
PID 5824 wrote to memory of 3296	5824	cmd.exe	94
PID 5824 wrote to memory of 2512	5824	cmd.exe	95
PID 5824 wrote to memory of 5952	5824	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4136
- 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:5656
- - 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\00002627" 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:5824
  - - 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:2908
  - - 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:3296
  - - 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:2512
  - - 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:5952

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:1892

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

00002627

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002627
Size 94KB
SHA256 0c6157c6550253df3cb507afbcbbc951f0ee7ca76918d7937fdf982838fabcbd
MD5 a56a97ae448202e164b1575c8ca27780
SHA1 6e8a5420c1f9caa9abbdfe37566aad07480274a8
SHA512 db8d39cca3a6927a26441cdd1895bf3d95d3923039b55aa27ba9931e02aaa5088b88521345ca8e76590d73a7f19ba076667399d8a1119f6ede03477c2e7e47d1
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NV:RLy2Kerc64CiGImFYgUBWTb4/NV
TLSH
T14B937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 74ae20f7461cfbe57fae7edbcd1ccc60b65f5f03123f3b7c3a3852c546f4570b
MD5 085ae9aecc7eee309277c70fb0e08d09
SHA1 8d12ec175e63961c365beabc752ca2478c8cf68e
SHA512 f964e01f68941c6f70f7317a7555ca2a362f0566f9e3b75c18e6e43639d7b51666614c0dbb1f67302447f2e5bbe05509bb82ade46e8f1d175735b0ac4ec5e706
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ns:RLy2Kerc64CiGImFYgUBWTb4/Ns
TLSH
T1B6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4136-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4136-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5656-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5952-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5952-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads