juko | a54160ed5e502692538cbe9c1fb92ef22f0b34a2c71e9ff8545477ac25f2f003

General

Target
2026-07-06_017549b166f4558764f666a7f2c5fcaf_elex_wannacry.exe
Size 57KB
Sample260706-mps26ady3s
SHA256 a54160ed5e502692538cbe9c1fb92ef22f0b34a2c71e9ff8545477ac25f2f003
MD5 017549b166f4558764f666a7f2c5fcaf
SHA1 d473cfb0ec80bc0e317f7c2ccf769e0974fb9590
SHA512 db35227b8a9a92e47fbe8bcab5cef8ae3eb6c58b9fa36cf93af4dbd75adb357afad2c1fbf46581e12b6276b40642bbfa01cd006c707f4e8854633d094fba671d
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ7:qLy2Kerc64CiGImklNUyp8Tk
TLSH
T18D433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/4808-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b586-5.dat	family_juko
behavioral2/memory/4808-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3856-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c595-13.dat	family_juko
behavioral2/memory/3308-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3308-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3856	WINWORD.exe
3308	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-1-5-21-2639994890-966400312-4246138405-1000\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

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	2026-07-06_017549b166f4558764f666a7f2c5fcaf_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
616	PING.EXE
6072	cmd.exe
712	PING.EXE
5360	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
712	PING.EXE
5360	PING.EXE
616	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 3856	4808	2026-07-06_017549b166f4558764f666a7f2c5fcaf_elex_wannacry.exe	88
PID 3856 wrote to memory of 6072	3856	WINWORD.exe	89
PID 6072 wrote to memory of 712	6072	cmd.exe	91
PID 6072 wrote to memory of 5360	6072	cmd.exe	92
PID 6072 wrote to memory of 616	6072	cmd.exe	93
PID 6072 wrote to memory of 3308	6072	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-06_017549b166f4558764f666a7f2c5fcaf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-06_017549b166f4558764f666a7f2c5fcaf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4808
- 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:3856
- - 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\00006667" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:6072
  - - 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:712
  - - 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:5360
  - - 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:616
  - - 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:3308

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00006667

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006667
Size 57KB
SHA256 d7291c020f2ca127dcb7f53a407f2c2e05a46530a8be300c8d1281d29f2c29ea
MD5 1de95a3f61509166c98c5a7c847b0296
SHA1 396b235e5651c807bf9b160b6389b5d7c30dd52f
SHA512 08a1a5c15faf3c2c2ac8b98d185832071bd2098ee93850d3ba4217e88917ba713e7fe5eb569f7446354b8ff7dd82e21c64dc057812b6a42e83aff7584d02afb4
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQY:qLy2Kerc64CiGImklNUyp8Tr
TLSH
T14B433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 a54160ed5e502692538cbe9c1fb92ef22f0b34a2c71e9ff8545477ac25f2f003
MD5 017549b166f4558764f666a7f2c5fcaf
SHA1 d473cfb0ec80bc0e317f7c2ccf769e0974fb9590
SHA512 db35227b8a9a92e47fbe8bcab5cef8ae3eb6c58b9fa36cf93af4dbd75adb357afad2c1fbf46581e12b6276b40642bbfa01cd006c707f4e8854633d094fba671d
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ7:qLy2Kerc64CiGImklNUyp8Tk
TLSH
T18D433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3308-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3308-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3856-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4808-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4808-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads