juko | 72f2df76e965a571c8fdc8bb98057d1932f4b7375af66a6d1cd8c188093cfa8a

General

Target
2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe
Size 95KB
Sample260802-ejadvssycv
SHA256 72f2df76e965a571c8fdc8bb98057d1932f4b7375af66a6d1cd8c188093cfa8a
MD5 c39c68b4626fc1b3450c8a5e7f1f9244
SHA1 dd74f6535f41ecf386cf59bbb721d71254eca28b
SHA512 902a50493272dbac79f911b08f828cd1a1f8a0dfb7fabaecb032fab4085cdbbe505b136323328935f12fafd6986d3323ff996e23783159eb2b92ee5acec7a3b0
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNX:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAr
TLSH
T1F093CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/3368-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cc9-5.dat	family_juko
behavioral2/memory/3368-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/444-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c466-13.dat	family_juko
behavioral2/memory/2532-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2532-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
444	WINWORD.exe
2532	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
5624	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	2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_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
5624	cmd.exe
4620	PING.EXE
1272	PING.EXE
1984	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4620	PING.EXE
1272	PING.EXE
1984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 444	3368	2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe	89
PID 444 wrote to memory of 5624	444	WINWORD.exe	90
PID 5624 wrote to memory of 4620	5624	cmd.exe	92
PID 5624 wrote to memory of 1272	5624	cmd.exe	93
PID 5624 wrote to memory of 1984	5624	cmd.exe	94
PID 5624 wrote to memory of 2532	5624	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_c39c68b4626fc1b3450c8a5e7f1f9244_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3368
- 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:444
- - 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\00006261" 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:5624
  - - 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:4620
  - - 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:1272
  - - 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:1984
  - - 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:2532

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

00006261

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006261
Size 95KB
SHA256 1b642e3d316aa5cc69468453d6f37904591737da9fa0bba37b60c15e43228966
MD5 a6f007f3e9b0811da974c20057841d35
SHA1 5e1f839076debb616a87071e54538920de6b8bf2
SHA512 37706f96e3375210c340de439cc5b1f0db832d545472d99b6cbcf45214dcd04d883dca265c4dc5d0a6881d907cab7dcaa45624f18a0e76882de9a2d0f7959ecd
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNF:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAh
TLSH
T15993CF167B986051D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 72f2df76e965a571c8fdc8bb98057d1932f4b7375af66a6d1cd8c188093cfa8a
MD5 c39c68b4626fc1b3450c8a5e7f1f9244
SHA1 dd74f6535f41ecf386cf59bbb721d71254eca28b
SHA512 902a50493272dbac79f911b08f828cd1a1f8a0dfb7fabaecb032fab4085cdbbe505b136323328935f12fafd6986d3323ff996e23783159eb2b92ee5acec7a3b0
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNX:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAr
TLSH
T1F093CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/444-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2532-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2532-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3368-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3368-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads