juko | 6e1e5987b8bbc637287e6741ddb18a59598101de5b1b3a9156011a490c45ad9d

General

Target
2026-08-14_64e00cdc3eaf1c534d5f0ecfe4bc6ffd_elex_wannacry.exe
Size 87KB
Sample260814-b3mlrastby
SHA256 6e1e5987b8bbc637287e6741ddb18a59598101de5b1b3a9156011a490c45ad9d
MD5 64e00cdc3eaf1c534d5f0ecfe4bc6ffd
SHA1 4932501dae5bd3bb0aad49f7100ba109efb18b93
SHA512 21c6824dbff87e1b78b9a77de8520b7cc3c20958125def96971d14c502375815fdafb007406cebaf91031134022ca4a000ae4f6e14fa3920f07368e63b342748
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpx:2Ly2Kerc64CiGIm1K851YO6EQkwpx
TLSH
T17793A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
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/2936-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b85c-5.dat	family_juko
behavioral2/memory/2936-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4076-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c537-13.dat	family_juko
behavioral2/memory/4336-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4336-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4076	WINWORD.exe
4336	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-1-5-21-3611646547-550105268-947503007-1000\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
1200	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	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	2026-08-14_64e00cdc3eaf1c534d5f0ecfe4bc6ffd_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
1200	cmd.exe
4356	PING.EXE
3624	PING.EXE
5956	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4356	PING.EXE
3624	PING.EXE
5956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2936 wrote to memory of 4076	2936	2026-08-14_64e00cdc3eaf1c534d5f0ecfe4bc6ffd_elex_wannacry.exe	89
PID 4076 wrote to memory of 1200	4076	WINWORD.exe	90
PID 1200 wrote to memory of 4356	1200	cmd.exe	92
PID 1200 wrote to memory of 3624	1200	cmd.exe	93
PID 1200 wrote to memory of 5956	1200	cmd.exe	94
PID 1200 wrote to memory of 4336	1200	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-14_64e00cdc3eaf1c534d5f0ecfe4bc6ffd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-14_64e00cdc3eaf1c534d5f0ecfe4bc6ffd_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2936
- 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:4076
- - 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\00005E32" 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:1200
  - - 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:4356
  - - 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:3624
  - - 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:5956
  - - 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:4336

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

Replay Monitor

Loading Replay Monitor...

Downloads

00005E32

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005E32
Size 87KB
SHA256 48632b2209068521671b3b144ffd1803d2dec0767d31182511d09744511a2ce5
MD5 c0dbb634296d2d5eb142edff420041eb
SHA1 3774adb367f5768861cc811f1cc2a5dd916830ab
SHA512 3ff705d8810b7545c23dbb264ff239d68ffa7b60b04bd1f037b7fc62725b22e8f30f931116ee4459f28e9941fe03652f992e596c1ed5ecf23f8fb315e2f71f9d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpM:2Ly2Kerc64CiGIm1K851YO6EQkwpM
TLSH
T17A93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 6e1e5987b8bbc637287e6741ddb18a59598101de5b1b3a9156011a490c45ad9d
MD5 64e00cdc3eaf1c534d5f0ecfe4bc6ffd
SHA1 4932501dae5bd3bb0aad49f7100ba109efb18b93
SHA512 21c6824dbff87e1b78b9a77de8520b7cc3c20958125def96971d14c502375815fdafb007406cebaf91031134022ca4a000ae4f6e14fa3920f07368e63b342748
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpx:2Ly2Kerc64CiGIm1K851YO6EQkwpx
TLSH
T17793A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2936-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2936-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4076-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4336-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4336-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads