juko | 94b070998a8259e6148b9c4faa27a9a4d24e375a181538d2220f130a54657a4b

General

Target
2026-08-03_a6573130a5a0704df600b40eda82e498_elex_wannacry.exe
Size 57KB
Sample260803-kx51ksself
SHA256 94b070998a8259e6148b9c4faa27a9a4d24e375a181538d2220f130a54657a4b
MD5 a6573130a5a0704df600b40eda82e498
SHA1 ad9571f0fa5f9b61aa820f4c3d56c055fde48b53
SHA512 6c60d78b5c4a028213253c250835b364e07d76e73ae1ba3d94685e78010ac17720fe2c1a39828c1058f46e482e772885358a3996991425e119f9c6bb9524e4a4
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQv:qLy2Kerc64CiGImklNUyp8TU
TLSH
T165433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/2748-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x0009000000019cc1-5.dat	family_juko
behavioral2/memory/2748-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1552-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c519-13.dat	family_juko
behavioral2/memory/5096-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5096-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1552	WINWORD.exe
5096	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-1-5-21-1875162379-3804078649-638427191-1000\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
4900	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	2026-08-03_a6573130a5a0704df600b40eda82e498_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
4900	cmd.exe
5960	PING.EXE
4316	PING.EXE
2528	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5960	PING.EXE
4316	PING.EXE
2528	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2748 wrote to memory of 1552	2748	2026-08-03_a6573130a5a0704df600b40eda82e498_elex_wannacry.exe	89
PID 1552 wrote to memory of 4900	1552	WINWORD.exe	90
PID 4900 wrote to memory of 5960	4900	cmd.exe	92
PID 4900 wrote to memory of 4316	4900	cmd.exe	93
PID 4900 wrote to memory of 2528	4900	cmd.exe	94
PID 4900 wrote to memory of 5096	4900	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_a6573130a5a0704df600b40eda82e498_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_a6573130a5a0704df600b40eda82e498_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2748
- 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:1552
- - 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\000009E3" 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:4900
  - - 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:5960
  - - 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:4316
  - - 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:2528
  - - 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:5096

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

000009E3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000009E3
Size 57KB
SHA256 ae6b19f668b059622d70372695fe592f8c15e535fdf9d86a821aeab0f1332403
MD5 da997e4651f930b43f56ef2da085e7f2
SHA1 e8dd8254730dd98bb51848118331283db54529af
SHA512 1fe0d134c61c4e51e9ba0f3d4ac9b811c9030d160a6a8349877dfcf10a08a1d835adbe096cf8a9fdefeb50dc2370a384ab9184bcc01c21eec6c9755b5f8cdf08
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQH:qLy2Kerc64CiGImklNUyp8T4
TLSH
T17D433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 94b070998a8259e6148b9c4faa27a9a4d24e375a181538d2220f130a54657a4b
MD5 a6573130a5a0704df600b40eda82e498
SHA1 ad9571f0fa5f9b61aa820f4c3d56c055fde48b53
SHA512 6c60d78b5c4a028213253c250835b364e07d76e73ae1ba3d94685e78010ac17720fe2c1a39828c1058f46e482e772885358a3996991425e119f9c6bb9524e4a4
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQv:qLy2Kerc64CiGImklNUyp8TU
TLSH
T165433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1552-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2748-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2748-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5096-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5096-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads