juko | 334c3126b7c953bd8cad69842555d112b86cf512d4e3960f3aef79ff11460490

General

Target
2026-08-09_bbd3226faa31d60d8532dff90bb46e1c_elex_wannacry.exe
Size 49KB
Sample260809-emqj9azdmg
SHA256 334c3126b7c953bd8cad69842555d112b86cf512d4e3960f3aef79ff11460490
MD5 bbd3226faa31d60d8532dff90bb46e1c
SHA1 096106fd54007b82173bb7f84d6ac768928b511c
SHA512 1dafbbcca0ae9cb0f7de8b602592b6b43adb85008710cd164494ff131a8ad7b6d57c0e5084934ff94fdfc29a440ff4ad251b339c790097b5f23ed6023387cb5c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2g:4Ly2Kerc64CiGImVu8p4kojWh2g
TLSH
T134334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2832-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/2832-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5596-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/4276-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4276-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5596	WINWORD.exe
4276	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-1-5-21-1738198120-2966725515-3980530802-1000\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
2484	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	2026-08-09_bbd3226faa31d60d8532dff90bb46e1c_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
1808	PING.EXE
4460	PING.EXE
2484	cmd.exe
1664	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4460	PING.EXE
1664	PING.EXE
1808	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2832 wrote to memory of 5596	2832	2026-08-09_bbd3226faa31d60d8532dff90bb46e1c_elex_wannacry.exe	90
PID 5596 wrote to memory of 2484	5596	WINWORD.exe	91
PID 2484 wrote to memory of 1664	2484	cmd.exe	93
PID 2484 wrote to memory of 1808	2484	cmd.exe	94
PID 2484 wrote to memory of 4460	2484	cmd.exe	95
PID 2484 wrote to memory of 4276	2484	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-09_bbd3226faa31d60d8532dff90bb46e1c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_bbd3226faa31d60d8532dff90bb46e1c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2832
- 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:5596
- - 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\00000C33" 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:2484
  - - 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:1664
  - - 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:1808
  - - 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:4460
  - - 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:4276

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

00000C33

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000C33
Size 49KB
SHA256 a597af52c5ce4e8ee91167ec75cd19e88d1598630bde898df7f717c4291aefe2
MD5 17c4045eab4f1a7beb587b81615ecfe0
SHA1 9fced68b63e04909d7eaf006d44750b955e2d12d
SHA512 4872b84bbe7148931a00f7fab5610a8d0db443c4617ad5b65c9ed346e21f9a939abd0ed08b29f8ac71e9fb3a0744eabc0ef2ce46a751976bed33e44a80e6024e
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2E:4Ly2Kerc64CiGImVu8p4kojWh2E
TLSH
T155334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 334c3126b7c953bd8cad69842555d112b86cf512d4e3960f3aef79ff11460490
MD5 bbd3226faa31d60d8532dff90bb46e1c
SHA1 096106fd54007b82173bb7f84d6ac768928b511c
SHA512 1dafbbcca0ae9cb0f7de8b602592b6b43adb85008710cd164494ff131a8ad7b6d57c0e5084934ff94fdfc29a440ff4ad251b339c790097b5f23ed6023387cb5c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2g:4Ly2Kerc64CiGImVu8p4kojWh2g
TLSH
T134334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2832-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2832-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4276-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4276-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5596-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads