juko | 600f8be8fc91767c962bc3c140a9ed3d5a60b0e1bf41d5ae9edbfa73c6cf2cc5

General

Target
2026-08-27_edf19067a787818f5da59b227be1f969_elex_wannacry.exe
Size 88KB
Sample260828-c4pyyabf47
SHA256 600f8be8fc91767c962bc3c140a9ed3d5a60b0e1bf41d5ae9edbfa73c6cf2cc5
MD5 edf19067a787818f5da59b227be1f969
SHA1 b76ee14c1caf3c98b05eba7afae52e4ee7c34611
SHA512 f0157bcb58f4892b01929f28e3eb8f09c88ede71d837d57cf0c56724921eeb9bfa7c688f5fd97f01a4030020a383debb37795d326de41859379dd9bd10a87c73
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsE:zLy2Kerc64CiGImHc/28wzCBlycJWeeT
TLSH
T1B6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4336-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000900000001b83c-5.dat	family_juko
behavioral2/memory/4336-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2672-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c583-13.dat	family_juko
behavioral2/memory/3296-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3296-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2672	WINWORD.exe
3296	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-1-5-21-1079202589-886135813-2527035092-1000\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
3684	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	2026-08-27_edf19067a787818f5da59b227be1f969_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
3684	cmd.exe
2544	PING.EXE
2864	PING.EXE
4280	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4280	PING.EXE
2544	PING.EXE
2864	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4336 wrote to memory of 2672	4336	2026-08-27_edf19067a787818f5da59b227be1f969_elex_wannacry.exe	89
PID 2672 wrote to memory of 3684	2672	WINWORD.exe	90
PID 3684 wrote to memory of 2544	3684	cmd.exe	92
PID 3684 wrote to memory of 2864	3684	cmd.exe	93
PID 3684 wrote to memory of 4280	3684	cmd.exe	94
PID 3684 wrote to memory of 3296	3684	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-27_edf19067a787818f5da59b227be1f969_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-27_edf19067a787818f5da59b227be1f969_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4336
- 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:2672
- - 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\0000007C" 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:3684
  - - 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:2544
  - - 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:2864
  - - 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:4280
  - - 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:3296

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

0000007C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000007C
Size 88KB
SHA256 41c2ada11a1613c2579edc176c19f79d995093716578cb5503a7a7988f3f7c2f
MD5 127b6b21465a8f6ae0b003c9134f1896
SHA1 63d9f92f88c70adbbcf7241b9765ad1139869061
SHA512 16d313e916414c2f3a0d26c11cf549fc57acb59e326614d9d56dc08aa80bf4a12b896a13926d1fe6529b5a58b166df958de85b27cc10664dd1882b42f71db5a4
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsE:zLy2Kerc64CiGImHc/28wzCBlycJWeen
TLSH
T14F933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 600f8be8fc91767c962bc3c140a9ed3d5a60b0e1bf41d5ae9edbfa73c6cf2cc5
MD5 edf19067a787818f5da59b227be1f969
SHA1 b76ee14c1caf3c98b05eba7afae52e4ee7c34611
SHA512 f0157bcb58f4892b01929f28e3eb8f09c88ede71d837d57cf0c56724921eeb9bfa7c688f5fd97f01a4030020a383debb37795d326de41859379dd9bd10a87c73
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsE:zLy2Kerc64CiGImHc/28wzCBlycJWeeT
TLSH
T1B6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2672-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3296-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3296-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4336-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4336-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads