juko | a9beb3e8ce484e61c0560fd3f743dfe22eeb601e10f07c646c6606e500e9b4d8

General

Target
2026-08-05_745cecbaf19036112869f58d544e1ad4_elex_wannacry.exe
Size 94KB
Sample260805-k33seagg54
SHA256 a9beb3e8ce484e61c0560fd3f743dfe22eeb601e10f07c646c6606e500e9b4d8
MD5 745cecbaf19036112869f58d544e1ad4
SHA1 94b0fe749f30c4d35acce6fa0481067fabbc0be1
SHA512 84b72cce1d9456741e81e44ef4d5f10679a32c6b448abb39bc606c0afc8c0dc8336eb72a691dd7e40022199805d64814b731c57d0dd83dcd564190a405faebec
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NS:RLy2Kerc64CiGImFYgUBWTb4/NS
TLSH
T147937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/5256-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cc9-5.dat	family_juko
behavioral2/memory/5256-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4876-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c624-13.dat	family_juko
behavioral2/memory/4120-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4120-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4876	WINWORD.exe
4120	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
3696	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	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	2026-08-05_745cecbaf19036112869f58d544e1ad4_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

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
3696	cmd.exe
4124	PING.EXE
1360	PING.EXE
2560	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2560	PING.EXE
4124	PING.EXE
1360	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5256 wrote to memory of 4876	5256	2026-08-05_745cecbaf19036112869f58d544e1ad4_elex_wannacry.exe	88
PID 4876 wrote to memory of 3696	4876	WINWORD.exe	89
PID 3696 wrote to memory of 4124	3696	cmd.exe	91
PID 3696 wrote to memory of 1360	3696	cmd.exe	92
PID 3696 wrote to memory of 2560	3696	cmd.exe	93
PID 3696 wrote to memory of 4120	3696	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-05_745cecbaf19036112869f58d544e1ad4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_745cecbaf19036112869f58d544e1ad4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5256
- 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\00000464" 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:3696
  - - 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:4124
  - - 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:1360
  - - 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:2560
  - - 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:4120

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

00000464

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000464
Size 94KB
SHA256 9879725a7b320e1939236c9f65699f31c82595c4944345fa93363b6900825b05
MD5 bb1da2a8c54754bbe025f6815db48806
SHA1 471e5e649257cd147616d021e4d7e27886733438
SHA512 a4870eda95088732c3d742c1270aa4a419198d2903ae83f728ac9758b317e6ee7c4142fcaa674539f648b139e41d95336a547de43c9cf37422e00abd2b076508
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NH:RLy2Kerc64CiGImFYgUBWTb4/NH
TLSH
T109937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 a9beb3e8ce484e61c0560fd3f743dfe22eeb601e10f07c646c6606e500e9b4d8
MD5 745cecbaf19036112869f58d544e1ad4
SHA1 94b0fe749f30c4d35acce6fa0481067fabbc0be1
SHA512 84b72cce1d9456741e81e44ef4d5f10679a32c6b448abb39bc606c0afc8c0dc8336eb72a691dd7e40022199805d64814b731c57d0dd83dcd564190a405faebec
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NS:RLy2Kerc64CiGImFYgUBWTb4/NS
TLSH
T147937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4120-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4120-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4876-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5256-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5256-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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