juko | 1b12fe6b1a0863603b7eafa5b05dd6d5ba7e9b511279daa14e225d9485172457

General

Target
2026-08-08_7707b0a55ffdf34f556bbd0c4e6e8a06_elex_wannacry.exe
Size 37KB
Sample260808-ksqebstckd
SHA256 1b12fe6b1a0863603b7eafa5b05dd6d5ba7e9b511279daa14e225d9485172457
MD5 7707b0a55ffdf34f556bbd0c4e6e8a06
SHA1 89c9b9fc3321a2840c9f4eb7181791eb7bcfc910
SHA512 9f57458ef28de73cdd04850d1d33f3efb32fc9837d0687b8e7ba1afeb9710c418f9a47cf176294bc72dd14e8ab6b8628cc516082138e95be4745f593f97e1243
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaS:3LsF2Kerc64sTiX2IV0DhuogwB
TLSH
T19A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/764-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b3a-5.dat	family_juko
behavioral2/memory/764-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1204-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000700000001b8b6-13.dat	family_juko
behavioral2/memory/3684-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3684-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1204	WINWORD.exe
3684	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-1-5-21-3797332335-34111092-3597280141-1000\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
272	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-08_7707b0a55ffdf34f556bbd0c4e6e8a06_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

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
272	cmd.exe
5768	PING.EXE
252	PING.EXE
4612	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5768	PING.EXE
252	PING.EXE
4612	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 764 wrote to memory of 1204	764	2026-08-08_7707b0a55ffdf34f556bbd0c4e6e8a06_elex_wannacry.exe	90
PID 1204 wrote to memory of 272	1204	WINWORD.exe	91
PID 272 wrote to memory of 5768	272	cmd.exe	93
PID 272 wrote to memory of 252	272	cmd.exe	94
PID 272 wrote to memory of 4612	272	cmd.exe	95
PID 272 wrote to memory of 3684	272	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-08_7707b0a55ffdf34f556bbd0c4e6e8a06_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_7707b0a55ffdf34f556bbd0c4e6e8a06_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:764
- 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:1204
- - 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\00003E6C" 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:272
  - - 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:5768
  - - 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:252
  - - 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:4612
  - - 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:3684

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

00003E6C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003E6C
Size 37KB
SHA256 829f7c7508083bfa63a50eaa6e4438efb72770311657742f024ebe5371507545
MD5 0b11024a63f4e111860b75355e7a3776
SHA1 a544fd2b8ea7be48e06d31b543fba83ce02d0309
SHA512 ae4f6fbdfa46d07d01c4ebf0276614a885c87e58645fc9be4dd3a3b18d799dff033ae7ab09e4b6278d156986fc445f3d21d82f5f95017786650334b25681cb75
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaQ:3LsF2Kerc64sTiX2IV0DhuogwL
TLSH
T141035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 1b12fe6b1a0863603b7eafa5b05dd6d5ba7e9b511279daa14e225d9485172457
MD5 7707b0a55ffdf34f556bbd0c4e6e8a06
SHA1 89c9b9fc3321a2840c9f4eb7181791eb7bcfc910
SHA512 9f57458ef28de73cdd04850d1d33f3efb32fc9837d0687b8e7ba1afeb9710c418f9a47cf176294bc72dd14e8ab6b8628cc516082138e95be4745f593f97e1243
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaS:3LsF2Kerc64sTiX2IV0DhuogwB
TLSH
T19A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/764-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/764-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1204-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3684-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3684-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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