juko | 6bf2aaee5d07dbf96aa9f8e44a8b3f54577603ab7456572e335639ef4fcce24d

General

Target
2026-07-01_378d535f91bb53f97fafe3cd9975e521_elex_wannacry.exe
Size 88KB
Sample260701-caabdscs6n
SHA256 6bf2aaee5d07dbf96aa9f8e44a8b3f54577603ab7456572e335639ef4fcce24d
MD5 378d535f91bb53f97fafe3cd9975e521
SHA1 ce8d625926aa1581b1463a4c447b940b038135d3
SHA512 3046de4396a5767d8324539aca3a8a5a551b7fe4be7f348f7b63bf6d4fb2c16b0410b6465a8a873bd0ac78711ef9ee5266518221c7abe3cafb70c0550b2e5dcd
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsJ:zLy2Kerc64CiGImHc/28wzCBlycJWeeS
TLSH
T18A933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/2884-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x0008000000016b38-5.dat	family_juko
behavioral2/memory/2884-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1304-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c5ca-13.dat	family_juko
behavioral2/memory/3872-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3872-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1304	WINWORD.exe
3872	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-1-5-21-3865087520-2734723108-1233268525-1000\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

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-01_378d535f91bb53f97fafe3cd9975e521_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

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
1660	PING.EXE
5320	cmd.exe
1100	PING.EXE
4728	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1100	PING.EXE
4728	PING.EXE
1660	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2884 wrote to memory of 1304	2884	2026-07-01_378d535f91bb53f97fafe3cd9975e521_elex_wannacry.exe	88
PID 1304 wrote to memory of 5320	1304	WINWORD.exe	89
PID 5320 wrote to memory of 1100	5320	cmd.exe	91
PID 5320 wrote to memory of 4728	5320	cmd.exe	92
PID 5320 wrote to memory of 1660	5320	cmd.exe	93
PID 5320 wrote to memory of 3872	5320	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-01_378d535f91bb53f97fafe3cd9975e521_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_378d535f91bb53f97fafe3cd9975e521_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2884
- 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:1304
- - 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\0000038D" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5320
  - - 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:1100
  - - 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:4728
  - - 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:1660
  - - 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:3872

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

0000038D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000038D
Size 88KB
SHA256 fb2419cd65b1978de3b616a3915ce23aaeb0eb8b4e130dcd841f1880e9caae2f
MD5 6bfdb67742287af9340fe672df632bf3
SHA1 35b44f6de9230fa9c35a78696d4c658e9bacaad6
SHA512 7b92c68fb936e015e37c84517ce8ea8bc395439184516a64a98c580c2d4124fe14b45df35517e91ec6c9f3a80f3ceb31fcbb8a727eb7dc4037e97629413133b1
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsb:zLy2Kerc64CiGImHc/28wzCBlycJWee4
TLSH
T1A6933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 6bf2aaee5d07dbf96aa9f8e44a8b3f54577603ab7456572e335639ef4fcce24d
MD5 378d535f91bb53f97fafe3cd9975e521
SHA1 ce8d625926aa1581b1463a4c447b940b038135d3
SHA512 3046de4396a5767d8324539aca3a8a5a551b7fe4be7f348f7b63bf6d4fb2c16b0410b6465a8a873bd0ac78711ef9ee5266518221c7abe3cafb70c0550b2e5dcd
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsJ:zLy2Kerc64CiGImHc/28wzCBlycJWeeS
TLSH
T18A933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1304-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2884-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2884-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3872-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3872-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads