juko | dd35dc54e9b47f17cd0de67e7a3bf36202a060842ab3cd5a822b37c6fdbc1b38

General

Target
2026-08-10_e906dbd20550fb5c22a29f783caf1d65_elex_wannacry.exe
Size 49KB
Sample260810-3djmcabp9v
SHA256 dd35dc54e9b47f17cd0de67e7a3bf36202a060842ab3cd5a822b37c6fdbc1b38
MD5 e906dbd20550fb5c22a29f783caf1d65
SHA1 872fdd104003a02a2cba309ed7313a8dad0bcbe2
SHA512 c88775a21828ba258e2ebc706561982ba9e1209743ed69d08b56f3813129449c8785679ad6f7ce6ca287cc43c94048af208e259c069de8b33e21cf3dcb7840a5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:4Ly2Kerc64CiGImVu8p4kojWh29
TLSH
T166334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral2/memory/7004-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001300000001157e-5.dat	family_juko
behavioral2/memory/7004-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1948-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5c1-13.dat	family_juko
behavioral2/memory/4324-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4324-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1948	WINWORD.exe
4324	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-1-5-21-1014449518-1831897916-4205727055-1000\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
4280	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_e906dbd20550fb5c22a29f783caf1d65_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
2464	PING.EXE
6292	PING.EXE
4772	PING.EXE
4280	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2464	PING.EXE
6292	PING.EXE
4772	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 7004 wrote to memory of 1948	7004	2026-08-10_e906dbd20550fb5c22a29f783caf1d65_elex_wannacry.exe	90
PID 1948 wrote to memory of 4280	1948	WINWORD.exe	91
PID 4280 wrote to memory of 2464	4280	cmd.exe	93
PID 4280 wrote to memory of 6292	4280	cmd.exe	94
PID 4280 wrote to memory of 4772	4280	cmd.exe	95
PID 4280 wrote to memory of 4324	4280	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-10_e906dbd20550fb5c22a29f783caf1d65_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_e906dbd20550fb5c22a29f783caf1d65_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:7004
- 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:1948
- - 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\00002101" 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:4280
  - - 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:2464
  - - 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:6292
  - - 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:4772
  - - 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:4324

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

00002101

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002101
Size 49KB
SHA256 21a7a8c4001588c3770087731f8ec115a0e1f28f315d325ba4663c272c9aa3a2
MD5 f1f6ae2dfbc07c797c1bc34a8e0a30a2
SHA1 ddb67b0f2b0990a05a7993d95d7a9babb718cbe7
SHA512 4e13d4bc37dad4331708c06f6388c29b27d71b62d18644969ad708a27ee3dc972d3945f2e0e11e2efbddabf6baee5049d569e8438da1cd5818709a158cffa3a6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h22:4Ly2Kerc64CiGImVu8p4kojWh22
TLSH
T105334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 dd35dc54e9b47f17cd0de67e7a3bf36202a060842ab3cd5a822b37c6fdbc1b38
MD5 e906dbd20550fb5c22a29f783caf1d65
SHA1 872fdd104003a02a2cba309ed7313a8dad0bcbe2
SHA512 c88775a21828ba258e2ebc706561982ba9e1209743ed69d08b56f3813129449c8785679ad6f7ce6ca287cc43c94048af208e259c069de8b33e21cf3dcb7840a5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:4Ly2Kerc64CiGImVu8p4kojWh29
TLSH
T166334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1948-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4324-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4324-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/7004-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/7004-9-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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