juko | bc890141adfb448f6231a7851c9bbbd98e7866dcaf7c29f07b078c9612f1c405

General

Target
2026-08-02_42db5d3c940fa76b3262c76696a3a216_elex_wannacry.exe
Size 39KB
Sample260802-1q4ryaxyhv
SHA256 bc890141adfb448f6231a7851c9bbbd98e7866dcaf7c29f07b078c9612f1c405
MD5 42db5d3c940fa76b3262c76696a3a216
SHA1 b9e8a8ede1568a82f4186f4686d36c1179d57f21
SHA512 92a1cce2ad0bdd32d5ef877d7b9462c9383f83aeab7683f1719e23e4908213c8900abfe687e9e94b50c75cd79e4bed3fe86013ce5d5a58ada545e9aacdef5b13
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBF:aLsF2Kerc64sTiX2IV0DVyIGFe
TLSH
T1D7035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1236-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b3a-5.dat	family_juko
behavioral2/memory/1236-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1136-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001400000001c512-13.dat	family_juko
behavioral2/memory/1132-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1132-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1136	WINWORD.exe
1132	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-1-5-21-3797332335-34111092-3597280141-1000\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
1940	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_42db5d3c940fa76b3262c76696a3a216_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

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
2020	PING.EXE
120	PING.EXE
1940	cmd.exe
1340	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1340	PING.EXE
2020	PING.EXE
120	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1236 wrote to memory of 1136	1236	2026-08-02_42db5d3c940fa76b3262c76696a3a216_elex_wannacry.exe	89
PID 1136 wrote to memory of 1940	1136	WINWORD.exe	90
PID 1940 wrote to memory of 1340	1940	cmd.exe	92
PID 1940 wrote to memory of 2020	1940	cmd.exe	93
PID 1940 wrote to memory of 120	1940	cmd.exe	94
PID 1940 wrote to memory of 1132	1940	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_42db5d3c940fa76b3262c76696a3a216_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_42db5d3c940fa76b3262c76696a3a216_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1236
- 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:1136
- - 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\00003F6B" 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:1940
  - - 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:1340
  - - 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:2020
  - - 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:120
  - - 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:1132

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

00003F6B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003F6B
Size 39KB
SHA256 f1d4476a112a609aa90ae090ceb0bca4cc472c3810ff731a8d2fe9e3b9605e36
MD5 d0d045d254dc3b1d9016ef06d3a3496d
SHA1 6122430d9cd1843ebec4f8cb1cf0e9c058f245f2
SHA512 cd12a915c18beb20f75deef91dac514754a2c5da2a59a4e9ff891515336c199623647be063599ea150bb4a903e92dcd7fbb010507680a01a86f963c99085f3ca
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB9:aLsF2Kerc64sTiX2IV0DVyIGFi
TLSH
T1EE036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 bc890141adfb448f6231a7851c9bbbd98e7866dcaf7c29f07b078c9612f1c405
MD5 42db5d3c940fa76b3262c76696a3a216
SHA1 b9e8a8ede1568a82f4186f4686d36c1179d57f21
SHA512 92a1cce2ad0bdd32d5ef877d7b9462c9383f83aeab7683f1719e23e4908213c8900abfe687e9e94b50c75cd79e4bed3fe86013ce5d5a58ada545e9aacdef5b13
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBF:aLsF2Kerc64sTiX2IV0DVyIGFe
TLSH
T1D7035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1132-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1132-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1136-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1236-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1236-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads