juko | 3f6f57a90f96baa7ff43fb703e3deadc23fc77abbfff051dbd949bac0c32b625

General

Target
2026-08-10_b5f05a437259ff8c15f723df83a0d8e6_elex_wannacry.exe
Size 94KB
Sample260810-gm5ehsscrd
SHA256 3f6f57a90f96baa7ff43fb703e3deadc23fc77abbfff051dbd949bac0c32b625
MD5 b5f05a437259ff8c15f723df83a0d8e6
SHA1 ded29023391266b1ed89af7b435fc66b3e49b9be
SHA512 81df7526de8e57ad2b8d77a71adc19963736fe37fe0809add2cd1b51662fed557705268cd0ccc1fb753001f0ae7690a37e6af3e271ec025b9393ba910315bac1
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NH:RLy2Kerc64CiGImFYgUBWTb4/NH
TLSH
T18E937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/2696-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b89b-5.dat	family_juko
behavioral2/memory/2696-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1496-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c495-13.dat	family_juko
behavioral2/memory/5036-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5036-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1496	WINWORD.exe
5036	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
2252	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	2026-08-10_b5f05a437259ff8c15f723df83a0d8e6_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
4996	PING.EXE
4192	PING.EXE
1500	PING.EXE
2252	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4996	PING.EXE
4192	PING.EXE
1500	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2696 wrote to memory of 1496	2696	2026-08-10_b5f05a437259ff8c15f723df83a0d8e6_elex_wannacry.exe	89
PID 1496 wrote to memory of 2252	1496	WINWORD.exe	90
PID 2252 wrote to memory of 4996	2252	cmd.exe	92
PID 2252 wrote to memory of 4192	2252	cmd.exe	93
PID 2252 wrote to memory of 1500	2252	cmd.exe	94
PID 2252 wrote to memory of 5036	2252	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_b5f05a437259ff8c15f723df83a0d8e6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_b5f05a437259ff8c15f723df83a0d8e6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2696
- 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:1496
- - 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\00007A69" 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:2252
  - - 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:4996
  - - 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:4192
  - - 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:1500
  - - 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:5036

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

00007A69

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A69
Size 94KB
SHA256 9c14558795f3aa4f9091fb48a1a44070abf47f958e99643320ad4786499c257d
MD5 e294132deda62fb3f7fcbf89ad543ab9
SHA1 f3b9603ed935195cbfb2bd73e220509bbf3a608b
SHA512 bf39ac178e6742f9152a9e0fc640b6d32ab2811a730a43f82d5d1ff5d47dc4c08ac279d45fbfa71cc24ad439cdd77102dad6afb2c868daaf025113ffb9a7896d
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NH:RLy2Kerc64CiGImFYgUBWTb4/NH
TLSH
T168937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 3f6f57a90f96baa7ff43fb703e3deadc23fc77abbfff051dbd949bac0c32b625
MD5 b5f05a437259ff8c15f723df83a0d8e6
SHA1 ded29023391266b1ed89af7b435fc66b3e49b9be
SHA512 81df7526de8e57ad2b8d77a71adc19963736fe37fe0809add2cd1b51662fed557705268cd0ccc1fb753001f0ae7690a37e6af3e271ec025b9393ba910315bac1
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NH:RLy2Kerc64CiGImFYgUBWTb4/NH
TLSH
T18E937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1496-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2696-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2696-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5036-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5036-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads