juko | a8f7a53e798bf456f3f220390c50644fb3bb683d7ff54ae8ee48861d186ee527

General

Target
2026-10-27_efaed104d3d5180230cd0087b76a6c6f_elex_wannacry.exe
Size 36KB
Sample261027-2fb5lsvy5k
SHA256 a8f7a53e798bf456f3f220390c50644fb3bb683d7ff54ae8ee48861d186ee527
MD5 efaed104d3d5180230cd0087b76a6c6f
SHA1 7f12d3972fcc4810a1467d5c5175d5c6c2c079aa
SHA512 058dba7a8ef9bc67e5b96ec6148e8a0acfcabbc0c044feba1e7d0b9eb20939113de2de14c0be497dee24d9428633b0c78464f4e49b9225a58847dd5aa8403c93
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpi:OLsF2Kerc64sTiX2IV0Dhui
TLSH
T1D9F23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DDE
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/0x00090000000068e2-3.dat	family_juko
behavioral2/files/0x001100000001c4d8-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4032	WINWORD.exe
2544	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-1-5-21-4057491610-3392471755-192832105-1000\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
5036	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-10-27_efaed104d3d5180230cd0087b76a6c6f_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
5036	cmd.exe
2208	PING.EXE
3000	PING.EXE
3664	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2208	PING.EXE
3000	PING.EXE
3664	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5688 wrote to memory of 4032	5688	2026-10-27_efaed104d3d5180230cd0087b76a6c6f_elex_wannacry.exe	90
PID 4032 wrote to memory of 5036	4032	WINWORD.exe	91
PID 5036 wrote to memory of 2208	5036	cmd.exe	93
PID 5036 wrote to memory of 3000	5036	cmd.exe	94
PID 5036 wrote to memory of 3664	5036	cmd.exe	95
PID 5036 wrote to memory of 2544	5036	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-27_efaed104d3d5180230cd0087b76a6c6f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-27_efaed104d3d5180230cd0087b76a6c6f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5688
- 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:4032
- - 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\0000042F" 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:5036
  - - 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:2208
  - - 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:3000
  - - 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:3664
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2544

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000042F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000042F
Size 36KB
SHA256 84eb7ec5e2cdf2a76f4aa0ed6475ec1d98280a5892502c1b6121ee089fb33ceb
MD5 22991fb66dd1a79f8c98004e8c7d1be8
SHA1 0c52e5b89942357af74f5c1081e4e01e537ebaa8
SHA512 53a936f946928ed9ad8b72357b4d73fe49d5eb17d9b76847bbe68217b50c155cb4b8de9f16933a0dc9e0c7164098844634e837772d082898c533fa84dbbdc818
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp1:OLsF2Kerc64sTiX2IV0Dhu1
TLSH
T150F23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 36KB
SHA256 a8f7a53e798bf456f3f220390c50644fb3bb683d7ff54ae8ee48861d186ee527
MD5 efaed104d3d5180230cd0087b76a6c6f
SHA1 7f12d3972fcc4810a1467d5c5175d5c6c2c079aa
SHA512 058dba7a8ef9bc67e5b96ec6148e8a0acfcabbc0c044feba1e7d0b9eb20939113de2de14c0be497dee24d9428633b0c78464f4e49b9225a58847dd5aa8403c93
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpi:OLsF2Kerc64sTiX2IV0Dhui
TLSH
T1D9F23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DDE
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