juko | e0fae1916aa9a9eae37c0adfa78371d7bc57e9699f62acc7981d4df98175ceda

General

Target
2026-04-15_337acd7c1b5ff69ad093e0de25b10542_elex_wannacry.exe
Size 138KB
Sample260415-l4pgvaev6t
SHA256 e0fae1916aa9a9eae37c0adfa78371d7bc57e9699f62acc7981d4df98175ceda
MD5 337acd7c1b5ff69ad093e0de25b10542
SHA1 9140cae0dae8fe748534a2a721ed4af5db296560
SHA512 bbdc23bc799d24495b4111933bd8415a0182e88cd77648063f9a938e07f49a87c2544b681bcfafdbe9bda627d62b7b54d40649004bcc1d63a122d1dbdf3ef4db
SSDEEP 3072:sLy2Kerc64CiGIm8aRgqG91AJ0qVIdWkDnRqkXCMFJBrXWWestyFG73:sLy2Kwc64YIZ+C2JisNM5XWWe0LL
TLSH
T151D33A1563FA461AE5FF06BCA930103F0576BF221917E59F394831FD0B79781CAA23A6
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/4048-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000d000000027002-5.dat	family_juko
behavioral2/memory/4048-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/3040-14-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b4a8-15.dat	family_juko
behavioral2/memory/4552-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4552-18-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3040	WINWORD.exe
4552	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-1-5-21-600123060-2148212387-2211176695-1000\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	2026-04-15_337acd7c1b5ff69ad093e0de25b10542_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
5052	cmd.exe
3420	PING.EXE
5840	PING.EXE
4272	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3420	PING.EXE
5840	PING.EXE
4272	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4048 wrote to memory of 3040	4048	2026-04-15_337acd7c1b5ff69ad093e0de25b10542_elex_wannacry.exe	79
PID 3040 wrote to memory of 5052	3040	WINWORD.exe	80
PID 5052 wrote to memory of 3420	5052	cmd.exe	82
PID 5052 wrote to memory of 5840	5052	cmd.exe	83
PID 5052 wrote to memory of 4272	5052	cmd.exe	84
PID 5052 wrote to memory of 4552	5052	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-15_337acd7c1b5ff69ad093e0de25b10542_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_337acd7c1b5ff69ad093e0de25b10542_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4048
- 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:3040
- - 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\000046FD" 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:5052
  - - 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:3420
  - - 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:5840
  - - 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:4272
  - - 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:4552

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

000046FD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000046FD
Size 138KB
SHA256 1765571469a8f38ef534ee9d40e01ae53c04333cebd579344b6840f41a5622ee
MD5 bb8952b0ced8dc4b62b33a17a186b761
SHA1 ed1dd04c9d0b82f5271906b61e1ef933b4bd68f7
SHA512 8f4827a4f38cd4bed8a902a541ffa01f4a788d8edafe30027b68f6f08cf89ada980024009682518fe1d22bfaffb141dac8fd1d0e12e871f395f8105c102ddf40
SSDEEP 3072:sLy2Kerc64CiGIm8aRgqG91AJ0qVIdWkDnRqkXCMFJBrXWWestyFG7B:sLy2Kwc64YIZ+C2JisNM5XWWe0Ld
TLSH
T19CD33A1563FA461AE5FF06BCA930103F0576BF221917E59F394831FD0B79781CAA23A6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 138KB
SHA256 e0fae1916aa9a9eae37c0adfa78371d7bc57e9699f62acc7981d4df98175ceda
MD5 337acd7c1b5ff69ad093e0de25b10542
SHA1 9140cae0dae8fe748534a2a721ed4af5db296560
SHA512 bbdc23bc799d24495b4111933bd8415a0182e88cd77648063f9a938e07f49a87c2544b681bcfafdbe9bda627d62b7b54d40649004bcc1d63a122d1dbdf3ef4db
SSDEEP 3072:sLy2Kerc64CiGIm8aRgqG91AJ0qVIdWkDnRqkXCMFJBrXWWestyFG73:sLy2Kwc64YIZ+C2JisNM5XWWe0LL
TLSH
T151D33A1563FA461AE5FF06BCA930103F0576BF221917E59F394831FD0B79781CAA23A6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3040-14-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4048-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4048-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4552-17-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4552-18-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads