juko | ff889e19c4ec2e8cf5615cc07b4b2b8bb9e4701b601523fca498ed60a4501b55

General

Target
2026-08-24_30da56fe7547e02e7d37ae4c4eefa835_elex_wannacry.exe
Size 68KB
Sample260825-tkpx9scj2z
SHA256 ff889e19c4ec2e8cf5615cc07b4b2b8bb9e4701b601523fca498ed60a4501b55
MD5 30da56fe7547e02e7d37ae4c4eefa835
SHA1 90f96c8de546ea092eada6b12ecfe444aebba5ca
SHA512 6c5cdd5287e0b1e566e7a2137e0bb541d8aba3499383137ed26c9e1ca80763ab448e8be011c8f0dbc6dfaaa6c4a9f14fed48e553b9cae06f9e078813039ea23d
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpb:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpb
TLSH
T13863A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/5612-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b87d-5.dat	family_juko
behavioral2/memory/5612-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4364-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4c8-13.dat	family_juko
behavioral2/memory/5136-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5136-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4364	WINWORD.exe
5136	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
2772	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	2026-08-24_30da56fe7547e02e7d37ae4c4eefa835_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
2772	cmd.exe
2500	PING.EXE
4376	PING.EXE
4716	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2500	PING.EXE
4376	PING.EXE
4716	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5612 wrote to memory of 4364	5612	2026-08-24_30da56fe7547e02e7d37ae4c4eefa835_elex_wannacry.exe	89
PID 4364 wrote to memory of 2772	4364	WINWORD.exe	90
PID 2772 wrote to memory of 2500	2772	cmd.exe	92
PID 2772 wrote to memory of 4376	2772	cmd.exe	93
PID 2772 wrote to memory of 4716	2772	cmd.exe	94
PID 2772 wrote to memory of 5136	2772	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_30da56fe7547e02e7d37ae4c4eefa835_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_30da56fe7547e02e7d37ae4c4eefa835_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5612
- 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:4364
- - 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\00004C03" 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:2772
  - - 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:2500
  - - 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:4376
  - - 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:4716
  - - 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:5136

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

00004C03

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004C03
Size 68KB
SHA256 c365216a1967e0805e38248f77c9bc69a48da89fb4638b27658e49e1e092865e
MD5 00eb524557a3a77a89f8fb606b7e55b4
SHA1 a5b039cb035569ab74708663d846c535c9887ec2
SHA512 dd9b1df5036183a30bb8f33f5f58cb482c8d2547078e6cb96d4a1f896dd50fe7905c63009f61c2eb86e21b442fd6516d85e2943915c07b50eb91ddcb2df89a54
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpE:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpE
TLSH
T16563A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 ff889e19c4ec2e8cf5615cc07b4b2b8bb9e4701b601523fca498ed60a4501b55
MD5 30da56fe7547e02e7d37ae4c4eefa835
SHA1 90f96c8de546ea092eada6b12ecfe444aebba5ca
SHA512 6c5cdd5287e0b1e566e7a2137e0bb541d8aba3499383137ed26c9e1ca80763ab448e8be011c8f0dbc6dfaaa6c4a9f14fed48e553b9cae06f9e078813039ea23d
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpb:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpb
TLSH
T13863A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4364-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5136-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5136-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5612-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5612-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads