juko | 37690590461635471f3d7fa8ad2bc453fd00808b2347b23e74b9559f330f1bc3

General

Target
2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe
Size 94KB
Sample260920-shdlsace83
SHA256 37690590461635471f3d7fa8ad2bc453fd00808b2347b23e74b9559f330f1bc3
MD5 641819b7f86ad706908ae1d935af708e
SHA1 9c6968f8589ab6e20f3770b59415cf2b48889451
SHA512 1217356450f7257439277337ed40db122cfce100c8fa730ea2eae67f692b2b5fc074f2af02bd5befe97244237ce6359ef07df661359bbfffa4861a1d42a97221
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Na:RLy2Kerc64CiGImFYgUBWTb4/Na
TLSH
T127937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/1380-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000800000001b85a-5.dat	family_juko
behavioral2/memory/1380-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5564-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c492-13.dat	family_juko
behavioral2/memory/240-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/240-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5564	WINWORD.exe
240	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-1-5-21-1404337215-1550464601-2805570857-1000\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
1536	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-20_641819b7f86ad706908ae1d935af708e_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

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
1536	cmd.exe
2752	PING.EXE
3736	PING.EXE
952	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3736	PING.EXE
952	PING.EXE
2752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1380 wrote to memory of 5564	1380	2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe	89
PID 5564 wrote to memory of 1536	5564	WINWORD.exe	90
PID 1536 wrote to memory of 2752	1536	cmd.exe	92
PID 1536 wrote to memory of 3736	1536	cmd.exe	93
PID 1536 wrote to memory of 952	1536	cmd.exe	94
PID 1536 wrote to memory of 240	1536	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1380
- 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:5564
- - 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\00000A67" 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:1536
  - - 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:2752
  - - 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:3736
  - - 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:952
  - - 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:240

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

00000A67

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000A67
Size 94KB
SHA256 9e481f082fbb3e36925e8bf05adfd2a045d549f82c5e6cfc3522c363eae93039
MD5 c815c7b113238a542e934e6fd8f7d98f
SHA1 95d7e1fe9ea91404e39c577962e65c7334d05de2
SHA512 1f1b17d212c156b12c94ba74f5014f392b1a933d1a3d37dd468c610169a4afa54f845fa9fb70e608d93ef1097810636ffddafa619f1d37a3bcd24a05f5900730
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ny:RLy2Kerc64CiGImFYgUBWTb4/Ny
TLSH
T12D937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 37690590461635471f3d7fa8ad2bc453fd00808b2347b23e74b9559f330f1bc3
MD5 641819b7f86ad706908ae1d935af708e
SHA1 9c6968f8589ab6e20f3770b59415cf2b48889451
SHA512 1217356450f7257439277337ed40db122cfce100c8fa730ea2eae67f692b2b5fc074f2af02bd5befe97244237ce6359ef07df661359bbfffa4861a1d42a97221
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Na:RLy2Kerc64CiGImFYgUBWTb4/Na
TLSH
T127937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/240-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/240-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1380-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1380-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5564-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads