juko | 2af744e21e0aff0d8c2d3cad1713fb6bb932c6681e5ae96e4ec26892391ae8df

General

Target
2026-08-12_222f0e921c86d7902008c7ec674b1263_elex_wannacry.exe
Size 49KB
Sample260812-ebnlhshr7s
SHA256 2af744e21e0aff0d8c2d3cad1713fb6bb932c6681e5ae96e4ec26892391ae8df
MD5 222f0e921c86d7902008c7ec674b1263
SHA1 5ddcbf13a627dc8d68449060e93436fba7b40b30
SHA512 ee133c2df785c0081fafdd9b2a52a2c4ad173684a9203ab2e984025d6037be72b63f90e2a1bf97ccf917ebdee23b5db9b290d04070e6b3292c31f3cda80af879
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2O:VLy2Kerc64CiGImVu8p4kojWh2O
TLSH
T18E334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3516-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c562-5.dat	family_juko
behavioral2/memory/3516-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3652-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c563-13.dat	family_juko
behavioral2/memory/4136-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4136-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3652	WINWORD.exe
4136	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-1-5-21-1738198120-2966725515-3980530802-1000\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
2932	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-12_222f0e921c86d7902008c7ec674b1263_elex_wannacry.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
2932	cmd.exe
4068	PING.EXE
1528	PING.EXE
5300	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4068	PING.EXE
1528	PING.EXE
5300	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3516 wrote to memory of 3652	3516	2026-08-12_222f0e921c86d7902008c7ec674b1263_elex_wannacry.exe	88
PID 3652 wrote to memory of 2932	3652	WINWORD.exe	89
PID 2932 wrote to memory of 4068	2932	cmd.exe	91
PID 2932 wrote to memory of 1528	2932	cmd.exe	92
PID 2932 wrote to memory of 5300	2932	cmd.exe	93
PID 2932 wrote to memory of 4136	2932	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-12_222f0e921c86d7902008c7ec674b1263_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_222f0e921c86d7902008c7ec674b1263_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3516
- 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:3652
- - 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\00005FA1" 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:2932
  - - 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:4068
  - - 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:1528
  - - 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:5300
  - - 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:4136

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

00005FA1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005FA1
Size 49KB
SHA256 05641da23efbfbc279090dd0427e775556fbc1d8be9142245aeb5c50471d1429
MD5 3580264abf95f9a812624b25479484e0
SHA1 dcf375f6a125c7f2b1049e6f0bef488fc6682969
SHA512 d872fd46ecee7a8cc0d82edb3f1a5cc8f89b99e6d56c9a920d5e744d151b9c2be68f30f271950c80b72e38bca6c61a2c73a9e47665209255244ec7583f0ade1f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2b:VLy2Kerc64CiGImVu8p4kojWh2b
TLSH
T1F9334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 2af744e21e0aff0d8c2d3cad1713fb6bb932c6681e5ae96e4ec26892391ae8df
MD5 222f0e921c86d7902008c7ec674b1263
SHA1 5ddcbf13a627dc8d68449060e93436fba7b40b30
SHA512 ee133c2df785c0081fafdd9b2a52a2c4ad173684a9203ab2e984025d6037be72b63f90e2a1bf97ccf917ebdee23b5db9b290d04070e6b3292c31f3cda80af879
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2O:VLy2Kerc64CiGImVu8p4kojWh2O
TLSH
T18E334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3516-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3516-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3652-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4136-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4136-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads