juko | 545151a048068b1d27f3cd554f0de94ddbadab7635ceda5a7f846448c5f1dca0

General

Target
2026-08-24_25b10d68747d95e499862992923dd821_elex_wannacry.exe
Size 53KB
Sample260825-vlflnacn2v
SHA256 545151a048068b1d27f3cd554f0de94ddbadab7635ceda5a7f846448c5f1dca0
MD5 25b10d68747d95e499862992923dd821
SHA1 dced91de3087d262c1a1ab9c4d4039029668f8db
SHA512 5b7f8a46ef44b13acfd86bdf8e15ff6f27bf5563a2b1e7d957ecce5c78ff3016e3688b0c106dff788ad3682b8d330575de24ad2022117f82f84bd32c97f96eb8
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq27:3Ly2Kerc64CiGIm1tcBMUOOF7
TLSH
T1AB335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000e000000019cd9-4.dat	family_juko
behavioral2/files/0x000d00000001c5ca-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4848	WINWORD.exe
5992	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-1-5-21-552508041-2681165170-3229858294-1000\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
4120	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	2026-08-24_25b10d68747d95e499862992923dd821_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
2276	PING.EXE
2140	PING.EXE
4120	cmd.exe
2092	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2092	PING.EXE
2276	PING.EXE
2140	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2440 wrote to memory of 4848	2440	2026-08-24_25b10d68747d95e499862992923dd821_elex_wannacry.exe	89
PID 4848 wrote to memory of 4120	4848	WINWORD.exe	90
PID 4120 wrote to memory of 2092	4120	cmd.exe	92
PID 4120 wrote to memory of 2276	4120	cmd.exe	93
PID 4120 wrote to memory of 2140	4120	cmd.exe	94
PID 4120 wrote to memory of 5992	4120	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_25b10d68747d95e499862992923dd821_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_25b10d68747d95e499862992923dd821_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2440
- 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:4848
- - 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\000052D4" 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:4120
  - - 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:2092
  - - 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:2276
  - - 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:2140
  - - 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:5992

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

000052D4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000052D4
Size 53KB
SHA256 13c09bd18fc9d66b4a542d6d30ad67ccd1f72885454814f96d009200cb2bf3dc
MD5 25d6a6cc8a22179654c381c39d8768fb
SHA1 8417031c28b2ebea965315cedffa4c64261bc800
SHA512 b388bca4dab947fbcfe5c5c27f8760f9fcb3295e74f660720eb5ed5d178808a0c9b6a99fb5c722f6e357592d0e7e3e6c7b3dc9145cc3aeb000699231eea2165b
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq20:3Ly2Kerc64CiGIm1tcBMUOOF0
TLSH
T119335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 545151a048068b1d27f3cd554f0de94ddbadab7635ceda5a7f846448c5f1dca0
MD5 25b10d68747d95e499862992923dd821
SHA1 dced91de3087d262c1a1ab9c4d4039029668f8db
SHA512 5b7f8a46ef44b13acfd86bdf8e15ff6f27bf5563a2b1e7d957ecce5c78ff3016e3688b0c106dff788ad3682b8d330575de24ad2022117f82f84bd32c97f96eb8
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq27:3Ly2Kerc64CiGIm1tcBMUOOF7
TLSH
T1AB335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads