juko | 67b5e7cb400ae7c80b363461670fa833f63fca665c7000a3a5a688c6eb23897a

General

Target
2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe
Size 50KB
Sample260813-jsnp3atvcx
SHA256 67b5e7cb400ae7c80b363461670fa833f63fca665c7000a3a5a688c6eb23897a
MD5 e35342f3f04143a2ee4ce8452443ba77
SHA1 1e71726446582df948e5e3c04564cacc259821f6
SHA512 2941e49363aa2de9817ea20544c5e0ed0338354653e92fd8462fd41757776ac30c0b156eaf23d03835b1de1001f5710066a3d667830ed9e1325a6e537f8ad3eb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOt:tLsF2Kerc64sTiX2IV0DpL8SE9nYOt
TLSH
T13633291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276143BB85B70D1CB2A52CF3298E
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/0x000b00000001136f-4.dat	family_juko
behavioral2/files/0x00030000000170b9-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5948	WINWORD.exe
4264	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-1-5-21-3986082593-3624157295-3514260330-1000\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
4324	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	2026-08-13_e35342f3f04143a2ee4ce8452443ba77_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
3176	PING.EXE
4324	cmd.exe
4616	PING.EXE
840	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4616	PING.EXE
840	PING.EXE
3176	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6116 wrote to memory of 5948	6116	2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe	88
PID 5948 wrote to memory of 4324	5948	WINWORD.exe	89
PID 4324 wrote to memory of 3176	4324	cmd.exe	91
PID 4324 wrote to memory of 4616	4324	cmd.exe	92
PID 4324 wrote to memory of 840	4324	cmd.exe	93
PID 4324 wrote to memory of 4264	4324	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6116
- 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:5948
- - 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\00007500" 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:4324
  - - 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:3176
  - - 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:4616
  - - 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:840
  - - 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:4264

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

00007500

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007500
Size 50KB
SHA256 716b4d2750748a8201ee1e7e0094348d4542fff5fc213aee58327816877d3b9a
MD5 0b8da27664d2f1c9634dd13ae7dce7aa
SHA1 ba349d78005366fb079610e6be0bbd2c3519d1ba
SHA512 e5e536776cc35613704e4d42fa451e9c31ae499a1b8e1ebe1c5571ed9fc4de90e8b07d6d2f623a3b10711fa4f09d838555831341ec37f0c2af706df32e9133d8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOM:tLsF2Kerc64sTiX2IV0DpL8SE9nYOM
TLSH
T19233291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 67b5e7cb400ae7c80b363461670fa833f63fca665c7000a3a5a688c6eb23897a
MD5 e35342f3f04143a2ee4ce8452443ba77
SHA1 1e71726446582df948e5e3c04564cacc259821f6
SHA512 2941e49363aa2de9817ea20544c5e0ed0338354653e92fd8462fd41757776ac30c0b156eaf23d03835b1de1001f5710066a3d667830ed9e1325a6e537f8ad3eb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOt:tLsF2Kerc64sTiX2IV0DpL8SE9nYOt
TLSH
T13633291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276143BB85B70D1CB2A52CF3298E
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