juko | ee7c6241833865ca76fc2dca0d74ef4b2d980fb7a38f58f04866d7fac6f6dd77

General

Target
2026-06-01_535d8f5478ef41d2e10fab6aad374cdb_elex_wannacry.exe
Size 49KB
Sample260601-qqn2dady7x
SHA256 ee7c6241833865ca76fc2dca0d74ef4b2d980fb7a38f58f04866d7fac6f6dd77
MD5 535d8f5478ef41d2e10fab6aad374cdb
SHA1 46c7edd30e0389b71a6634c4924671e327c2861e
SHA512 3c310003a55093a0cc215a387e9b47cd479f35eb350d6a19cc099e2308c10c121af0b7c997044ac24ea58697b5b854c940b40e39e1a34d9d877929afd71a9cd4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2b:VLy2Kerc64CiGImVu8p4kojWh2b
TLSH
T1D3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4492-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0016000000025ad8-5.dat	family_juko
behavioral2/memory/4492-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4876-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b4c0-15.dat	family_juko
behavioral2/memory/6036-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/6036-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4876	WINWORD.exe
6036	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-1-5-21-2746394149-3500112804-1243524366-1000\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	2026-06-01_535d8f5478ef41d2e10fab6aad374cdb_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
3784	PING.EXE
5276	PING.EXE
5036	cmd.exe
1684	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1684	PING.EXE
3784	PING.EXE
5276	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4492 wrote to memory of 4876	4492	2026-06-01_535d8f5478ef41d2e10fab6aad374cdb_elex_wannacry.exe	79
PID 4876 wrote to memory of 5036	4876	WINWORD.exe	80
PID 5036 wrote to memory of 1684	5036	cmd.exe	82
PID 5036 wrote to memory of 3784	5036	cmd.exe	83
PID 5036 wrote to memory of 5276	5036	cmd.exe	84
PID 5036 wrote to memory of 6036	5036	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-06-01_535d8f5478ef41d2e10fab6aad374cdb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-01_535d8f5478ef41d2e10fab6aad374cdb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4492
- 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:4876
- - 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\0000016E" 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:5036
  - - 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:1684
  - - 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:3784
  - - 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:5276
  - - 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:6036

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

0000016E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000016E
Size 49KB
SHA256 7704d6e1eccf4cbf7b8158cdf65ddba9d2a0f0a502fcd5b71c8b75d1bea0f3f7
MD5 32eccb271698ed5c1786d5438510446b
SHA1 54e78215b696b79c0d690860a70d18c25a57fc06
SHA512 1e1d8f5d6d21d2bfd2bb0db24a2c9b8a63cb5f5343e70539c42e26dd5bf87fd13ee84332da7369c80317b7f8d73c88e69969bec0496e0ee9030200aedcc63e29
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2V:VLy2Kerc64CiGImVu8p4kojWh2V
TLSH
T1C6334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 ee7c6241833865ca76fc2dca0d74ef4b2d980fb7a38f58f04866d7fac6f6dd77
MD5 535d8f5478ef41d2e10fab6aad374cdb
SHA1 46c7edd30e0389b71a6634c4924671e327c2861e
SHA512 3c310003a55093a0cc215a387e9b47cd479f35eb350d6a19cc099e2308c10c121af0b7c997044ac24ea58697b5b854c940b40e39e1a34d9d877929afd71a9cd4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2b:VLy2Kerc64CiGImVu8p4kojWh2b
TLSH
T1D3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4492-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4492-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4876-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6036-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6036-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads