juko | fcc27d8a96ce98f5e55b8ca0682f2705c406aa7c69a67af7ea49c8a66ce5705f

General

Target
2026-08-31_c30cc92ce409ce81ee1421a59e343e1a_elex_wannacry.exe
Size 42KB
Sample260831-sd63jaxsdv
SHA256 fcc27d8a96ce98f5e55b8ca0682f2705c406aa7c69a67af7ea49c8a66ce5705f
MD5 c30cc92ce409ce81ee1421a59e343e1a
SHA1 67e2f77fd34a666a9bf16f347acb6a63300486f4
SHA512 43a079fdaf4ed1c3e28d52c3c89feb886a3e866a89967d3e6e6846ce33250c0718f46427cb77d6e96ef22d145009ae1733059f68f954bae55e956e8ad857d1d2
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOl1:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOj
TLSH
T133134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
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/0x00170000000115f1-4.dat	family_juko
behavioral2/files/0x001100000001c4a6-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3272	WINWORD.exe
4340	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
940	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	2026-08-31_c30cc92ce409ce81ee1421a59e343e1a_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
4424	PING.EXE
4468	PING.EXE
5008	PING.EXE
940	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4424	PING.EXE
4468	PING.EXE
5008	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 3272	3008	2026-08-31_c30cc92ce409ce81ee1421a59e343e1a_elex_wannacry.exe	89
PID 3272 wrote to memory of 940	3272	WINWORD.exe	90
PID 940 wrote to memory of 4424	940	cmd.exe	92
PID 940 wrote to memory of 4468	940	cmd.exe	93
PID 940 wrote to memory of 5008	940	cmd.exe	94
PID 940 wrote to memory of 4340	940	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_c30cc92ce409ce81ee1421a59e343e1a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_c30cc92ce409ce81ee1421a59e343e1a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3008
- 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:3272
- - 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\00002A38" 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:940
  - - 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:4424
  - - 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:4468
  - - 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:5008
  - - 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:4340

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

Replay Monitor

Loading Replay Monitor...

Downloads

00002A38

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002A38
Size 42KB
SHA256 4f068076937dbe7281bb8bfcdbe44647757b0a4827e63da1f8e0dd37b85d644f
MD5 b1b34cd33717f05295ab327f1bd3f0a0
SHA1 1697ec993b3750518d0e81247766a9b9bbe52069
SHA512 981be453202a9ae2d203bf9e82a1caf9c3f6e9208c9d8b8b588c30ceb874eeef8e48e5ed4d3f0b9856261a4d9c18a63931001619bb09b65d788d540c59875c99
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlm:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOg
TLSH
T18B134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 fcc27d8a96ce98f5e55b8ca0682f2705c406aa7c69a67af7ea49c8a66ce5705f
MD5 c30cc92ce409ce81ee1421a59e343e1a
SHA1 67e2f77fd34a666a9bf16f347acb6a63300486f4
SHA512 43a079fdaf4ed1c3e28d52c3c89feb886a3e866a89967d3e6e6846ce33250c0718f46427cb77d6e96ef22d145009ae1733059f68f954bae55e956e8ad857d1d2
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOl1:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOj
TLSH
T133134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads