juko | 53dbe681913d8945b212276e7ee0def02e75bdcfe675bc7217fd7853088591bc

General

Target
2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe
Size 87KB
Sample260809-3t4mfsda24
SHA256 53dbe681913d8945b212276e7ee0def02e75bdcfe675bc7217fd7853088591bc
MD5 a287a50ec06473670b9d4182e3c9df7a
SHA1 d9e71e61fb4c2005bbb8e0af2164ef2df965ee99
SHA512 9013b57d551cc0c4b5e5c45b89bc34df9edc5770e18aa6ccbad478db84e36e1593339d5e4445baea45cc37efde09ed79e5cf127073eb7abf7fa19e37aed94e1b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpM:2Ly2Kerc64CiGIm1K851YO6EQkwpM
TLSH
T19493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4136-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b867-5.dat	family_juko
behavioral2/memory/4136-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4928-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c438-13.dat	family_juko
behavioral2/memory/4208-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4208-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4928	WINWORD.exe
4208	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
4496	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	2026-08-09_a287a50ec06473670b9d4182e3c9df7a_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
4496	cmd.exe
4596	PING.EXE
5200	PING.EXE
1512	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4596	PING.EXE
5200	PING.EXE
1512	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4136 wrote to memory of 4928	4136	2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe	89
PID 4928 wrote to memory of 4496	4928	WINWORD.exe	90
PID 4496 wrote to memory of 4596	4496	cmd.exe	92
PID 4496 wrote to memory of 5200	4496	cmd.exe	93
PID 4496 wrote to memory of 1512	4496	cmd.exe	94
PID 4496 wrote to memory of 4208	4496	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_a287a50ec06473670b9d4182e3c9df7a_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:4928
- - 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\00002761" 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:4496
  - - 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:4596
  - - 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:5200
  - - 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:1512
  - - 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:4208

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

00002761

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002761
Size 87KB
SHA256 6b3fbff9c00f05c546dd73d57b321d2cb8cac2397771a0a852cad0e9c835c110
MD5 2ab3324c7d0aeb70677207848d7dad06
SHA1 ccfc9a5e0966cf4f4039f853fb6a89c14c991878
SHA512 059cd5f536ac02f29d7b90264ffda82b8cb76d0bc828d2999daa0ea6a876c53fdf6f081f172f49ad10e16b1b95de8f76a071c3857a8548b8d2defcc0862c2549
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp0:2Ly2Kerc64CiGIm1K851YO6EQkwp0
TLSH
T1D393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 53dbe681913d8945b212276e7ee0def02e75bdcfe675bc7217fd7853088591bc
MD5 a287a50ec06473670b9d4182e3c9df7a
SHA1 d9e71e61fb4c2005bbb8e0af2164ef2df965ee99
SHA512 9013b57d551cc0c4b5e5c45b89bc34df9edc5770e18aa6ccbad478db84e36e1593339d5e4445baea45cc37efde09ed79e5cf127073eb7abf7fa19e37aed94e1b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpM:2Ly2Kerc64CiGIm1K851YO6EQkwpM
TLSH
T19493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4136-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4136-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4208-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4208-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4928-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads