juko | d1673802480291edf9aa067583d6991326a3d91998fdf457ac1bb913166ace68

General

Target
2026-08-22_8f8ecdc97b7f89327ea830127ed6241d_elex_wannacry.exe
Size 64KB
Sample260823-fns77sshjb
SHA256 d1673802480291edf9aa067583d6991326a3d91998fdf457ac1bb913166ace68
MD5 8f8ecdc97b7f89327ea830127ed6241d
SHA1 247b3cf33524967a68687503e16596ee22052e06
SHA512 5e6bb7751b14f6ad1daf2959dbd0b9bde5a95c53e513266b6e48751f6f4590bc8a1d29e684e04c17ed1288c6c907f950fe35d0c311c38e721d5af3e59838358b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uF:sLy2Kerc64CiGIm8so28F
TLSH
T1CC536C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000c00000001b88f-4.dat	family_juko
behavioral2/files/0x000e00000001c4ed-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2340	WINWORD.exe
2360	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-1-5-21-2301830172-776172150-2531349243-1000\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
5812	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-22_8f8ecdc97b7f89327ea830127ed6241d_elex_wannacry.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
5812	cmd.exe
5496	PING.EXE
3944	PING.EXE
4372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5496	PING.EXE
3944	PING.EXE
4372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4496 wrote to memory of 2340	4496	2026-08-22_8f8ecdc97b7f89327ea830127ed6241d_elex_wannacry.exe	89
PID 2340 wrote to memory of 5812	2340	WINWORD.exe	90
PID 5812 wrote to memory of 5496	5812	cmd.exe	92
PID 5812 wrote to memory of 3944	5812	cmd.exe	93
PID 5812 wrote to memory of 4372	5812	cmd.exe	94
PID 5812 wrote to memory of 2360	5812	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-22_8f8ecdc97b7f89327ea830127ed6241d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_8f8ecdc97b7f89327ea830127ed6241d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4496
- 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:2340
- - 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\000023DF" 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:5812
  - - 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:5496
  - - 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:3944
  - - 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:4372
  - - 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:2360

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

000023DF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000023DF
Size 64KB
SHA256 fb805a663924ee124982d52f2819d428e2e5543c74954d37d8618ccc1b080dc6
MD5 d6b31bc901502093fab5c9bcb406cf03
SHA1 99f0664a9e1b4322497b778d1363f6d5dc6a80c9
SHA512 b75e43113a3a1ea94c1e715b25dfe5c21a60ff30c50391f1d12e64adac521a37beef35f991dcb61c041c46821d584c026d149f0ce9f9ffa9340f67819486b5dc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uY:sLy2Kerc64CiGIm8so28Y
TLSH
T1FA535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 d1673802480291edf9aa067583d6991326a3d91998fdf457ac1bb913166ace68
MD5 8f8ecdc97b7f89327ea830127ed6241d
SHA1 247b3cf33524967a68687503e16596ee22052e06
SHA512 5e6bb7751b14f6ad1daf2959dbd0b9bde5a95c53e513266b6e48751f6f4590bc8a1d29e684e04c17ed1288c6c907f950fe35d0c311c38e721d5af3e59838358b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uF:sLy2Kerc64CiGIm8so28F
TLSH
T1CC536C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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