juko | e164d7a2ceabeb2e1ecfb9ec95acea35b010aa3bcc336b7b95c6799032095a46

General

Target
2026-08-16_5670525822fc530bc010609cd2cdd53b_elex_wannacry.exe
Size 49KB
Sample260816-wlgpdstepb
SHA256 e164d7a2ceabeb2e1ecfb9ec95acea35b010aa3bcc336b7b95c6799032095a46
MD5 5670525822fc530bc010609cd2cdd53b
SHA1 948ec438085881b59466198c8f7f49d4073a4271
SHA512 92e936276f62a0fbf0212aab9bae1cf3ed822f220efb6292b6b3c9f30e71ab8bbddd267495dbb560668092990ab10607f8b509e55b78f293f744338e3d1d63f5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2q:4Ly2Kerc64CiGImVu8p4kojWh2q
TLSH
T1DD334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/6116-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0010000000016cb6-5.dat	family_juko
behavioral2/memory/6116-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3304-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c63b-13.dat	family_juko
behavioral2/memory/4104-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4104-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3304	WINWORD.exe
4104	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
2256	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	2026-08-16_5670525822fc530bc010609cd2cdd53b_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
2256	cmd.exe
4188	PING.EXE
1068	PING.EXE
2832	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1068	PING.EXE
2832	PING.EXE
4188	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6116 wrote to memory of 3304	6116	2026-08-16_5670525822fc530bc010609cd2cdd53b_elex_wannacry.exe	90
PID 3304 wrote to memory of 2256	3304	WINWORD.exe	91
PID 2256 wrote to memory of 4188	2256	cmd.exe	93
PID 2256 wrote to memory of 1068	2256	cmd.exe	94
PID 2256 wrote to memory of 2832	2256	cmd.exe	95
PID 2256 wrote to memory of 4104	2256	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-16_5670525822fc530bc010609cd2cdd53b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-16_5670525822fc530bc010609cd2cdd53b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6116
- 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:3304
- - 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\000020C5" 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:2256
  - - 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:4188
  - - 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:1068
  - - 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:2832
  - - 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:4104

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

000020C5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000020C5
Size 49KB
SHA256 1753ff3417a89e24bd015171310ffbb88729bede9aa90f8fdfe92a5c38a2c12a
MD5 9f888adf1348ac4a8c75e0bfea0362eb
SHA1 664d0d0c7dd7f6a47b76b37b2871fb579f49a08f
SHA512 d3969f6dfee4f3366832dbd24fd83647466750cb3361dd7b64fdb9a71e396525386c277b67fb7193797dcc0bd5b0a9dc3c06e6f4d46fb2e0e7a0b9e356862a91
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:4Ly2Kerc64CiGImVu8p4kojWh2D
TLSH
T10D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 e164d7a2ceabeb2e1ecfb9ec95acea35b010aa3bcc336b7b95c6799032095a46
MD5 5670525822fc530bc010609cd2cdd53b
SHA1 948ec438085881b59466198c8f7f49d4073a4271
SHA512 92e936276f62a0fbf0212aab9bae1cf3ed822f220efb6292b6b3c9f30e71ab8bbddd267495dbb560668092990ab10607f8b509e55b78f293f744338e3d1d63f5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2q:4Ly2Kerc64CiGImVu8p4kojWh2q
TLSH
T1DD334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3304-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4104-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4104-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6116-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6116-9-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads