juko | 651e3356441cd195c39a415163dc23891171574f4123a766b894304a7c41ae1a

General

Target
2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe
Size 88KB
Sample260419-p24ersfy21
SHA256 651e3356441cd195c39a415163dc23891171574f4123a766b894304a7c41ae1a
MD5 0f1303e88dd48e85c0d0af75fb1308c7
SHA1 c47a75a3a65dbad882fde28502f51827be6d0625
SHA512 d429770d89c73cdd88d3c54fd669ada7737dc6043662a160de17d66f6a2f8129d22d46d32cdd84bd8be88c09d7314e5ff2505413258b9165cc120a8f6a953a35
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:sLy2Kerc64CiGIm8so28wzCBlycJWeeq
TLSH
T134933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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 2 IoCs

resource	yara_rule
behavioral2/files/0x002500000002b129-4.dat	family_juko
behavioral2/files/0x001c00000002b2a5-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3456	WINWORD.exe
3752	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-1-5-21-3847269522-1618051987-1942096715-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_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

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
3248	cmd.exe
2032	PING.EXE
3604	PING.EXE
728	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2032	PING.EXE
3604	PING.EXE
728	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4832 wrote to memory of 3456	4832	2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe	80
PID 3456 wrote to memory of 3248	3456	WINWORD.exe	81
PID 3248 wrote to memory of 2032	3248	cmd.exe	83
PID 3248 wrote to memory of 3604	3248	cmd.exe	84
PID 3248 wrote to memory of 728	3248	cmd.exe	85
PID 3248 wrote to memory of 3752	3248	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4832
- 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:3456
- - 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\00007DCD" 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:3248
  - - 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:2032
  - - 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:3604
  - - 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:728
  - - 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:3752

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

00007DCD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007DCD
Size 88KB
SHA256 341f7ab9e8e8cfbd462a014880342fa0bf160c63fa64152ab82ce02ac958bb49
MD5 434dfff972d03d9ace0c3cc726a9659d
SHA1 1fdaeec591dfe9c8e55bef56e44866c905258fab
SHA512 b42a8a5d9825d1806bda6f504ba7dcf339fcfc8acd4338c8a2896c620f8aa4792ac83e74aae11b3e4abe46d6ce52910a06f16f7c8ca0e4e66b383bf99bb0eb9c
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsu:sLy2Kerc64CiGIm8so28wzCBlycJWeel
TLSH
T127933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 651e3356441cd195c39a415163dc23891171574f4123a766b894304a7c41ae1a
MD5 0f1303e88dd48e85c0d0af75fb1308c7
SHA1 c47a75a3a65dbad882fde28502f51827be6d0625
SHA512 d429770d89c73cdd88d3c54fd669ada7737dc6043662a160de17d66f6a2f8129d22d46d32cdd84bd8be88c09d7314e5ff2505413258b9165cc120a8f6a953a35
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:sLy2Kerc64CiGIm8so28wzCBlycJWeeq
TLSH
T134933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3456-13-0x0000000000830000-0x00000000008EB000-memory.dmp

Download

memory/3752-16-0x0000000000A10000-0x0000000000ACB000-memory.dmp

Download

memory/3752-19-0x0000000000A10000-0x0000000000ACB000-memory.dmp

Download

memory/3752-21-0x0000000000A10000-0x0000000000ACB000-memory.dmp

Download

memory/3752-22-0x0000000000A10000-0x0000000000ACB000-memory.dmp

Download

memory/4832-10-0x0000000000830000-0x00000000008EB000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads