juko | e050dbf85e8c6230029010caa4f639bc9750da308d295a20d9e3f8fb7663b100

General

Target
2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe
Size 94KB
Sample260818-wlwtbaxeka
SHA256 e050dbf85e8c6230029010caa4f639bc9750da308d295a20d9e3f8fb7663b100
MD5 4d8f603bcd5328665443779348948755
SHA1 f1e14c453b0f564dac081ec59f4d8c6a7c8a43a9
SHA512 088d8f0e37ed60af5f4b0ecd7f28ee08aad77a8749a00464d3efc764c4e9e4c2c9695081d0221130bbe47485f1416db04106bb5cc1cad6676332b014562ea974
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N8:RLy2Kerc64CiGImFYgUBWTb4/N8
TLSH
T110937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/2900-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f000000019ca9-5.dat	family_juko
behavioral2/memory/2900-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4912-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c603-13.dat	family_juko
behavioral2/memory/2540-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2540-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4912	WINWORD.exe
2540	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
6056	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	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	2026-08-18_4d8f603bcd5328665443779348948755_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
6056	cmd.exe
1564	PING.EXE
5776	PING.EXE
4996	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1564	PING.EXE
5776	PING.EXE
4996	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 4912	2900	2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe	89
PID 4912 wrote to memory of 6056	4912	WINWORD.exe	90
PID 6056 wrote to memory of 1564	6056	cmd.exe	92
PID 6056 wrote to memory of 5776	6056	cmd.exe	93
PID 6056 wrote to memory of 4996	6056	cmd.exe	94
PID 6056 wrote to memory of 2540	6056	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_4d8f603bcd5328665443779348948755_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2900
- 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:4912
- - 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\00002663" 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:6056
  - - 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:1564
  - - 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:5776
  - - 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:\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:2540

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

00002663

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002663
Size 94KB
SHA256 1afd02d35458e1cdd54fa39a7bdeea0d14a3547bda3eb44f8fbc56fa4ce91670
MD5 7aa7effd3f8e67e8e7c3456d1f064850
SHA1 df74fc0f825fbdcdcfa01f2a2fa9d55e0ee6c093
SHA512 8f5c2bdf9bb3b99d731baf89ac1d67c78a407c6968f441107fd16a2f09aa3ee90f4141ff5befc3f7fd10fc0e6f519f899c870b6f760936fbad7021a977931fc7
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N4:RLy2Kerc64CiGImFYgUBWTb4/N4
TLSH
T10D937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 e050dbf85e8c6230029010caa4f639bc9750da308d295a20d9e3f8fb7663b100
MD5 4d8f603bcd5328665443779348948755
SHA1 f1e14c453b0f564dac081ec59f4d8c6a7c8a43a9
SHA512 088d8f0e37ed60af5f4b0ecd7f28ee08aad77a8749a00464d3efc764c4e9e4c2c9695081d0221130bbe47485f1416db04106bb5cc1cad6676332b014562ea974
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N8:RLy2Kerc64CiGImFYgUBWTb4/N8
TLSH
T110937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2540-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2540-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2900-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2900-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4912-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads