juko | b563a0c7a553eb365eaf49dbdd32d08b63cc4920fa0184596b6ae3cf75430bd3

General

Target
2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe
Size 50KB
Sample260818-2splgasbkh
SHA256 b563a0c7a553eb365eaf49dbdd32d08b63cc4920fa0184596b6ae3cf75430bd3
MD5 e3af6238248d7cd059fcc0970881183a
SHA1 5dc90c47a77fe627d6e1692675d6f7ad762de53f
SHA512 b7b65af05581adbe362e7a62275ddbe3dffdbaf9e43550bc7321a0f88421542401d287899a8a7cfdd8e2672b301f1369868287813f156d64ab446d07a7d18b4a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO1:tLsF2Kerc64sTiX2IV0DpL8SE9nYO1
TLSH
T1DB33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x002b000000011561-4.dat	family_juko
behavioral2/files/0x000e00000001c533-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4868	WINWORD.exe
1228	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-1-5-21-1014449518-1831897916-4205727055-1000\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
4172	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	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_e3af6238248d7cd059fcc0970881183a_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

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
4864	PING.EXE
4172	cmd.exe
4940	PING.EXE
5048	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4940	PING.EXE
5048	PING.EXE
4864	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4536 wrote to memory of 4868	4536	2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe	89
PID 4868 wrote to memory of 4172	4868	WINWORD.exe	90
PID 4172 wrote to memory of 4940	4172	cmd.exe	92
PID 4172 wrote to memory of 5048	4172	cmd.exe	93
PID 4172 wrote to memory of 4864	4172	cmd.exe	94
PID 4172 wrote to memory of 1228	4172	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4536
- 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:4868
- - 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\00001E36" 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:4172
  - - 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:4940
  - - 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:5048
  - - 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:4864
  - - 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:1228

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

00001E36

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001E36
Size 50KB
SHA256 ea5922c385a019e96e6824161bd553ab3d2e2bc8acfdb2ef30bb5baa2b413ba0
MD5 161c87033ff8fbd2755fe47328ab9cfd
SHA1 945bf0c4f86673531d83c276b7ddd6fb5635c023
SHA512 fdf984a360e0eca408ec7bd135ccb9aa2fbde903ea5aa1b4e7f1c29687b45f41511accad3c8b84e046babb72768107b8a6b9cd972338ab80d98b7032916c9fd8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOb:tLsF2Kerc64sTiX2IV0DpL8SE9nYOb
TLSH
T17B33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 b563a0c7a553eb365eaf49dbdd32d08b63cc4920fa0184596b6ae3cf75430bd3
MD5 e3af6238248d7cd059fcc0970881183a
SHA1 5dc90c47a77fe627d6e1692675d6f7ad762de53f
SHA512 b7b65af05581adbe362e7a62275ddbe3dffdbaf9e43550bc7321a0f88421542401d287899a8a7cfdd8e2672b301f1369868287813f156d64ab446d07a7d18b4a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO1:tLsF2Kerc64sTiX2IV0DpL8SE9nYO1
TLSH
T1DB33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads