juko | c490dc573a60f49cd668b150e697aefffdfbf15f1abf8ae211d0cbeeaf0f3669

General

Target
2026-08-23_b1b43fd1c043f6f071f0e6ecb4508416_elex_wannacry.exe
Size 56KB
Sample260824-bcf2aa1hlc
SHA256 c490dc573a60f49cd668b150e697aefffdfbf15f1abf8ae211d0cbeeaf0f3669
MD5 b1b43fd1c043f6f071f0e6ecb4508416
SHA1 054548512dac624fa8d887274abe0393308e9bc9
SHA512 1136d98c4afc8c8aee4cc6aac236190872278a823f4da582a1f3d598a3370996b70eaed928a9df991de5e726ef3a3c2523f97eaf79a9ba44c29cee782f3d4764
SSDEEP 1536:pLsF2Kerc64sTiX2IV0DhuD8OKFVG9WGW4:pLy2Kerc64CiGImVuD8OKFE9WB4
TLSH
T1CD4319263AE61CD3C15364F0EAE49B308078FD7219279023E794BB9815BEC92DF7199D
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/2872-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c000000011377-5.dat	family_juko
behavioral2/memory/2872-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/2416-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001100000001c528-13.dat	family_juko
behavioral2/memory/2584-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/2584-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2416	WINWORD.exe
2584	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
5104	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-23_b1b43fd1c043f6f071f0e6ecb4508416_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

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
4204	PING.EXE
5104	cmd.exe
2204	PING.EXE
4880	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2204	PING.EXE
4880	PING.EXE
4204	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2872 wrote to memory of 2416	2872	2026-08-23_b1b43fd1c043f6f071f0e6ecb4508416_elex_wannacry.exe	89
PID 2416 wrote to memory of 5104	2416	WINWORD.exe	90
PID 5104 wrote to memory of 2204	5104	cmd.exe	92
PID 5104 wrote to memory of 4880	5104	cmd.exe	93
PID 5104 wrote to memory of 4204	5104	cmd.exe	94
PID 5104 wrote to memory of 2584	5104	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-23_b1b43fd1c043f6f071f0e6ecb4508416_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_b1b43fd1c043f6f071f0e6ecb4508416_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2872
- 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:2416
- - 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\00004BFB" 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:5104
  - - 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:2204
  - - 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:4880
  - - 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:4204
  - - 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:2584

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

00004BFB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004BFB
Size 56KB
SHA256 e819cd675255f79cf1decb37ece1a07b5bba5e6c0fddcc246de102120c685963
MD5 8f159757b867e5bbb3b453982a12da8a
SHA1 a83d932ddb3edf285a4739a22bb5f0bd6854457a
SHA512 f8182e0dee660dc003d7d21e2f088ae970c5f78555f8c9c952045737ffc6ba4f986309171b74afbf919cd807abc54a731d80f55820b429cb4e61eef8ce53917d
SSDEEP 1536:pLsF2Kerc64sTiX2IV0DhuD8OKFVG9WGWC:pLy2Kerc64CiGImVuD8OKFE9WBC
TLSH
T13B4319263AE61CD3C15364F0EAE49B308078FD7219279023E794BB9815BEC92DF7199D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 c490dc573a60f49cd668b150e697aefffdfbf15f1abf8ae211d0cbeeaf0f3669
MD5 b1b43fd1c043f6f071f0e6ecb4508416
SHA1 054548512dac624fa8d887274abe0393308e9bc9
SHA512 1136d98c4afc8c8aee4cc6aac236190872278a823f4da582a1f3d598a3370996b70eaed928a9df991de5e726ef3a3c2523f97eaf79a9ba44c29cee782f3d4764
SSDEEP 1536:pLsF2Kerc64sTiX2IV0DhuD8OKFVG9WGW4:pLy2Kerc64CiGImVuD8OKFE9WB4
TLSH
T1CD4319263AE61CD3C15364F0EAE49B308078FD7219279023E794BB9815BEC92DF7199D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2416-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2584-15-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/2584-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2872-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2872-10-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads