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 8 IoCs

resource	yara_rule
behavioral1/memory/4368-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x001500000002433a-5.dat	family_juko
behavioral1/memory/4368-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4268-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4268-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000900000002449e-16.dat	family_juko
behavioral1/memory/4088-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4088-19-0x0000000000400000-0x000000000042B000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4268	WINWORD.exe
4088	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-1-5-21-1788976790-1541110888-1636651838-1000\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
2268	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	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	2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.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
3508	PING.EXE
2268	cmd.exe
1864	PING.EXE
1648	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1864	PING.EXE
1648	PING.EXE
3508	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 4268	4368	2026-07-29_085ae9aecc7eee309277c70fb0e08d09_elex_wannacry.exe	84
PID 4268 wrote to memory of 2268	4268	WINWORD.exe	85
PID 2268 wrote to memory of 1864	2268	cmd.exe	87
PID 2268 wrote to memory of 1648	2268	cmd.exe	88
PID 2268 wrote to memory of 3508	2268	cmd.exe	89
PID 2268 wrote to memory of 4088	2268	cmd.exe	90

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4368
- 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:4268
- - 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\00002C0B" 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:2268
  - - 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:1864
  - - 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:1648
  - - 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:3508
  - - 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:4088

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002C0B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002C0B
Size 94KB
SHA256 29d9786e33b81d2470e592ebd6dacfab6ee6d382c35861d306c3ef40780472ef
MD5 781781498e352b0cdc4d0e4076d4fcb2
SHA1 01cd862b46871188d1b3793b4ce91d626ca9db4e
SHA512 a5b68c5a8f54e577140f0c6c83e9df7b1ef27d548b99e37e952d6522fd82bbf4933d94fde372d095607059619d39d49869a57965e5401ab484f8834582b187e8
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N3:RLy2Kerc64CiGImFYgUBWTb4/N3
TLSH
T18C937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/4088-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4088-19-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4268-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4268-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4368-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4368-13-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads