juko | 8c94e78cd9c860f5bd34114e42c56de7276c49eb68e9f8ad8981acc29381fdcb

General

Target
2026-08-19_1809837f2295a1faecd1227948d9f784_elex_wannacry.exe
Size 50KB
Sample260819-kl49xaeb24
SHA256 8c94e78cd9c860f5bd34114e42c56de7276c49eb68e9f8ad8981acc29381fdcb
MD5 1809837f2295a1faecd1227948d9f784
SHA1 504b52e723550dbef49c8130b431d170d90d6ac9
SHA512 155c525e5f0c1009eec3e3ee31eb68bb79087f103a6bf3bfab59086a120de404f51b1786e8154337b915381535c843db608c17bacf620f4efd04568e10618dac
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOp:tLsF2Kerc64sTiX2IV0DpL8SE9nYOp
TLSH
T16433291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x000c000000016ce7-4.dat	family_juko
behavioral2/files/0x000e00000001c519-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4668	WINWORD.exe
2496	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-1-5-21-2115213192-531537726-3295841909-1000\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
5264	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	2026-08-19_1809837f2295a1faecd1227948d9f784_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
5264	cmd.exe
5736	PING.EXE
4012	PING.EXE
5660	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5736	PING.EXE
4012	PING.EXE
5660	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4288 wrote to memory of 4668	4288	2026-08-19_1809837f2295a1faecd1227948d9f784_elex_wannacry.exe	88
PID 4668 wrote to memory of 5264	4668	WINWORD.exe	89
PID 5264 wrote to memory of 5736	5264	cmd.exe	91
PID 5264 wrote to memory of 4012	5264	cmd.exe	92
PID 5264 wrote to memory of 5660	5264	cmd.exe	93
PID 5264 wrote to memory of 2496	5264	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-19_1809837f2295a1faecd1227948d9f784_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_1809837f2295a1faecd1227948d9f784_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4288
- 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:4668
- - 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\00007D88" 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:5264
  - - 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:5736
  - - 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:4012
  - - 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:5660
  - - 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:2496

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

00007D88

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007D88
Size 50KB
SHA256 bb29ec9f69b42da502f57d1c7099f089b230468059456fe9b0b3fd859397fbba
MD5 85af67da6314283f86fd22074ab29c49
SHA1 ed26f6fe0fe2ca1165f94b6018aa9a3082ac249f
SHA512 e0092af8381a32378d3ce2bcd7d9e52c72bbddea73216be9a2ece3b7d0a087c3327ea7b2ba6937d0c48c2fd192db36f86235308a9901bf77402e6a0ede3e7eb2
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOP:tLsF2Kerc64sTiX2IV0DpL8SE9nYOP
TLSH
T1C933291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 8c94e78cd9c860f5bd34114e42c56de7276c49eb68e9f8ad8981acc29381fdcb
MD5 1809837f2295a1faecd1227948d9f784
SHA1 504b52e723550dbef49c8130b431d170d90d6ac9
SHA512 155c525e5f0c1009eec3e3ee31eb68bb79087f103a6bf3bfab59086a120de404f51b1786e8154337b915381535c843db608c17bacf620f4efd04568e10618dac
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOp:tLsF2Kerc64sTiX2IV0DpL8SE9nYOp
TLSH
T16433291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads