juko | 3a9ba419bcf780511a96b58bf283fd99ff306c117d1034150ab86db86965d753

General

Target
2026-08-31_c316e748a6b0bcb64b33d6243c026f3c_elex_wannacry.exe
Size 32KB
Sample260831-sd4bmsvajh
SHA256 3a9ba419bcf780511a96b58bf283fd99ff306c117d1034150ab86db86965d753
MD5 c316e748a6b0bcb64b33d6243c026f3c
SHA1 c7e00b8fcdac75e4c4c099e06f777f10913e45c3
SHA512 3fa2edeb75405174ac4a384a30ca873f0421602f6f169acdaa330edee8c9afbc767f07af1971b7cf421c597800fb23ecf76232d00e8ad2b13bcce6b393ca1d6c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbff:tLsF2Kerc64sTiX2IV0DYQX
TLSH
T199E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000f00000001b1d0-4.dat	family_juko
behavioral2/files/0x000f00000001c4be-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5472	WINWORD.exe
2656	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-1-5-21-1738198120-2966725515-3980530802-1000\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
3396	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	2026-08-31_c316e748a6b0bcb64b33d6243c026f3c_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
4984	PING.EXE
3396	cmd.exe
4440	PING.EXE
4600	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4440	PING.EXE
4600	PING.EXE
4984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 784 wrote to memory of 5472	784	2026-08-31_c316e748a6b0bcb64b33d6243c026f3c_elex_wannacry.exe	89
PID 5472 wrote to memory of 3396	5472	WINWORD.exe	90
PID 3396 wrote to memory of 4440	3396	cmd.exe	92
PID 3396 wrote to memory of 4600	3396	cmd.exe	93
PID 3396 wrote to memory of 4984	3396	cmd.exe	94
PID 3396 wrote to memory of 2656	3396	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_c316e748a6b0bcb64b33d6243c026f3c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_c316e748a6b0bcb64b33d6243c026f3c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:784
- 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:5472
- - 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\00001104" 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:3396
  - - 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:4440
  - - 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:4600
  - - 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:4984
  - - 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:2656

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

00001104

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001104
Size 32KB
SHA256 13d4c1014595f7a1ae45e7a5b3a4f8ba56695b6b7d0e23c5584a02cb73001d5e
MD5 0a0e70c816a448b6a788e406d0a34c98
SHA1 f57bea07aa20c46f53246fb80f3f2d84e9e51368
SHA512 7e55cc4409feecb89cdb6df9f46d9448eaa61726809e37a4d298b5f187be5fa0eada644cfebb30abf606a37405ea61a65ca2e942b48b42b72669a19a607e7505
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfS:tLsF2Kerc64sTiX2IV0DYQq
TLSH
T19DE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 3a9ba419bcf780511a96b58bf283fd99ff306c117d1034150ab86db86965d753
MD5 c316e748a6b0bcb64b33d6243c026f3c
SHA1 c7e00b8fcdac75e4c4c099e06f777f10913e45c3
SHA512 3fa2edeb75405174ac4a384a30ca873f0421602f6f169acdaa330edee8c9afbc767f07af1971b7cf421c597800fb23ecf76232d00e8ad2b13bcce6b393ca1d6c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbff:tLsF2Kerc64sTiX2IV0DYQX
TLSH
T199E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads