juko | 3c3a2fa2f8e0760ddc4c2f61345f52fdcee19f63a91ea40569cfeb36de245bcf

General

Target
2026-10-19_89e54c78aa7d33d1d984dd5f6ea6d5f9_elex_wannacry.exe
Size 47KB
Sample261020-rckbpsav8x
SHA256 3c3a2fa2f8e0760ddc4c2f61345f52fdcee19f63a91ea40569cfeb36de245bcf
MD5 89e54c78aa7d33d1d984dd5f6ea6d5f9
SHA1 c7e54839c54250a577f1d75ec5916cabb939a4ff
SHA512 5511d57ff469076a22896b2cce8b75e82af26e57168ef56d26fc77a4488cceb6191bb224bc2eb4a661e66ad55e1b62baa09ebeb69668f3837d3c084f8b541ca9
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlslbPI:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOL
TLSH
T1FF237D1A6A98A052C59312B0FC5D5F35853E9DB814A7B103B344BB5D1CB2E63DF70E8E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0015000000016a78-3.dat	family_juko
behavioral2/files/0x001500000001c537-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
620	WINWORD.exe
1968	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-1-5-21-2714045687-1127350534-2056456672-1000\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
5336	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-19_89e54c78aa7d33d1d984dd5f6ea6d5f9_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

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
5336	cmd.exe
4224	PING.EXE
3672	PING.EXE
5052	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4224	PING.EXE
3672	PING.EXE
5052	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4848 wrote to memory of 620	4848	2026-10-19_89e54c78aa7d33d1d984dd5f6ea6d5f9_elex_wannacry.exe	91
PID 620 wrote to memory of 5336	620	WINWORD.exe	92
PID 5336 wrote to memory of 4224	5336	cmd.exe	94
PID 5336 wrote to memory of 3672	5336	cmd.exe	95
PID 5336 wrote to memory of 5052	5336	cmd.exe	96
PID 5336 wrote to memory of 1968	5336	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-10-19_89e54c78aa7d33d1d984dd5f6ea6d5f9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_89e54c78aa7d33d1d984dd5f6ea6d5f9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4848
- 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:620
- - 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\00004B2D" 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:5336
  - - 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:4224
  - - 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:3672
  - - 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:5052
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:1968

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00004B2D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004B2D
Size 47KB
SHA256 24ce3cb20516c733e7827e8fb2968a3f5d2f45ad6010950a71d1cd9f8af5df33
MD5 50759a831a027a0d965b084e92acec59
SHA1 9390987e8f0e0aa2fe4a1a189ccfc2b7b87bbc13
SHA512 c320f59ad5a36dad114e85ef03d105d09617eb5ef0d38b516748847b7ae82378850bab1825f0c0d46b0d74d200bb2f5248219aafc9a8d5e27ef511bfa7ac5557
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlslbPN:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOO2
TLSH
T12B237D1A6A98A052C59312B0FC5D5F35853E9DB814A7B103B344BB5D1CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 3c3a2fa2f8e0760ddc4c2f61345f52fdcee19f63a91ea40569cfeb36de245bcf
MD5 89e54c78aa7d33d1d984dd5f6ea6d5f9
SHA1 c7e54839c54250a577f1d75ec5916cabb939a4ff
SHA512 5511d57ff469076a22896b2cce8b75e82af26e57168ef56d26fc77a4488cceb6191bb224bc2eb4a661e66ad55e1b62baa09ebeb69668f3837d3c084f8b541ca9
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlslbPI:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOL
TLSH
T1FF237D1A6A98A052C59312B0FC5D5F35853E9DB814A7B103B344BB5D1CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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