juko | a69b2a9a9b938e6a7df1ed4a52a5a2fbb7cfef1276b5fc5a8014af38ad1c977b

General

Target
2026-08-09_957bb24143b03f64cf4c9281312e20ac_elex_wannacry.exe
Size 87KB
Sample260809-rbl4xastdw
SHA256 a69b2a9a9b938e6a7df1ed4a52a5a2fbb7cfef1276b5fc5a8014af38ad1c977b
MD5 957bb24143b03f64cf4c9281312e20ac
SHA1 a9a1613b17ae5fef504ef5bf379bfdcc8b4b4a9f
SHA512 5b2f20a2d4b54851b367c853509c3bb324eed16c74c5ec1cdcdd4c9d1baa5b44650b0675aef43e75e6457b8e7bf37beb4dc01c2136daddb40c925868d55da612
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T15393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/6076-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/6076-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1928-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0005000000016cbe-13.dat	family_juko
behavioral2/memory/2196-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2196-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1928	WINWORD.exe
2196	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
4524	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_957bb24143b03f64cf4c9281312e20ac_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

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
2872	PING.EXE
4852	PING.EXE
2212	PING.EXE
4524	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2872	PING.EXE
4852	PING.EXE
2212	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6076 wrote to memory of 1928	6076	2026-08-09_957bb24143b03f64cf4c9281312e20ac_elex_wannacry.exe	90
PID 1928 wrote to memory of 4524	1928	WINWORD.exe	91
PID 4524 wrote to memory of 2872	4524	cmd.exe	93
PID 4524 wrote to memory of 4852	4524	cmd.exe	94
PID 4524 wrote to memory of 2212	4524	cmd.exe	95
PID 4524 wrote to memory of 2196	4524	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-09_957bb24143b03f64cf4c9281312e20ac_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_957bb24143b03f64cf4c9281312e20ac_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6076
- 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:1928
- - 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\00000BFF" 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:4524
  - - 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:2872
  - - 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:4852
  - - 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:2212
  - - 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:2196

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

00000BFF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000BFF
Size 87KB
SHA256 fedd1001525095ed3e23f84d4749588f174eeb77645fdb9414705c590cac2a7a
MD5 007f04fe9ceffe01f717ea02b6a96eeb
SHA1 d703a218f6f120bde7197e59e59928d3de267d2c
SHA512 bc146a98f5683603057918d9a0eafbbaf41997b87ee000311ebd05fcef1fd9e4b3b668814a1fc1acf6f6bdcb8e28287d7164adb3e61fd5d89914c7cc5d1a4446
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpY:2Ly2Kerc64CiGIm1K851YO6EQkwpY
TLSH
T1E693A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 a69b2a9a9b938e6a7df1ed4a52a5a2fbb7cfef1276b5fc5a8014af38ad1c977b
MD5 957bb24143b03f64cf4c9281312e20ac
SHA1 a9a1613b17ae5fef504ef5bf379bfdcc8b4b4a9f
SHA512 5b2f20a2d4b54851b367c853509c3bb324eed16c74c5ec1cdcdd4c9d1baa5b44650b0675aef43e75e6457b8e7bf37beb4dc01c2136daddb40c925868d55da612
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T15393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1928-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2196-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2196-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6076-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6076-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads