juko | 8ca8758c14952b14e617eecc25a39845e03fa192f321c85a548a5c0a730b0b1e

General

Target
2026-08-29_fe87aeed60fd0667de4f3ff858b82b77_elex_wannacry.exe
Size 216KB
Sample260830-2qfwjsar7x
SHA256 8ca8758c14952b14e617eecc25a39845e03fa192f321c85a548a5c0a730b0b1e
MD5 fe87aeed60fd0667de4f3ff858b82b77
SHA1 329ca45b1ef5e27224f2ad6d7abf41391963f79a
SHA512 2fffc4f2c70f3c7d03ec04cf80ba30c6e561fb56c093b14dabf3b8f8d1c9d44ef8d74ad78c87dc826a042266aab78e740439531897af907d1a719681e91da4a1
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgi:uLy2Kwc64YIcyjIDLCSiDaQJ
TLSH
T1D7240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/3896-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/3896-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4620-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b9-13.dat	family_juko
behavioral2/memory/2492-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/2492-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4620	WINWORD.exe
2492	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
4588	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	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	2026-08-29_fe87aeed60fd0667de4f3ff858b82b77_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
3140	PING.EXE
3408	PING.EXE
5656	PING.EXE
4588	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3140	PING.EXE
3408	PING.EXE
5656	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3896 wrote to memory of 4620	3896	2026-08-29_fe87aeed60fd0667de4f3ff858b82b77_elex_wannacry.exe	89
PID 4620 wrote to memory of 4588	4620	WINWORD.exe	90
PID 4588 wrote to memory of 3140	4588	cmd.exe	92
PID 4588 wrote to memory of 3408	4588	cmd.exe	93
PID 4588 wrote to memory of 5656	4588	cmd.exe	94
PID 4588 wrote to memory of 2492	4588	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-29_fe87aeed60fd0667de4f3ff858b82b77_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-29_fe87aeed60fd0667de4f3ff858b82b77_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3896
- 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:4620
- - 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\00007781" 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:4588
  - - 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:3140
  - - 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:3408
  - - 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:5656
  - - 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:2492

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

00007781

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007781
Size 216KB
SHA256 cf53680c587d2ddf2bc465d01a68ec4de6508f7e81fb960d464324aead36041c
MD5 a91fa57bc2ad9832becb778179801c9c
SHA1 bfd26a5443f8f164a4486b9cefd49aa2ac1b4ae8
SHA512 4435ada5a056ae5a4e4081daa10dd61ad09d7bc61a56db61b8440418414380babaeda8111d4e68260b6b697c5a46a17d5c8dbe2a58246ea70eb05947c14dc09e
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgq:uLy2Kwc64YIcyjIDLCSiDaQV
TLSH
T165240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 216KB
SHA256 8ca8758c14952b14e617eecc25a39845e03fa192f321c85a548a5c0a730b0b1e
MD5 fe87aeed60fd0667de4f3ff858b82b77
SHA1 329ca45b1ef5e27224f2ad6d7abf41391963f79a
SHA512 2fffc4f2c70f3c7d03ec04cf80ba30c6e561fb56c093b14dabf3b8f8d1c9d44ef8d74ad78c87dc826a042266aab78e740439531897af907d1a719681e91da4a1
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgi:uLy2Kwc64YIcyjIDLCSiDaQJ
TLSH
T1D7240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2492-15-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2492-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3896-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3896-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4620-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads