juko | b2d305478428927f0f38d45efc74bf7f4a56d8e1d2270866b2e0ff5e764e4127

General

Target
2026-11-13_c1045a257ed9e47713691fd2fc082bf2_elex_wannacry.exe
Size 54KB
Sample261113-3qs2jsas21
SHA256 b2d305478428927f0f38d45efc74bf7f4a56d8e1d2270866b2e0ff5e764e4127
MD5 c1045a257ed9e47713691fd2fc082bf2
SHA1 e449fb9f569bdcac67a87d53aa4af79c1c9b2d79
SHA512 70e4cdcc667070e2684f49d0be5b41782cbeb60dec6573e23b8227eb3fa16b01dc21d7b025f2443fdca0963b724f7b93487576903a07f3bb698b68da08726a5c
SSDEEP 1536:LLsF2Kerc64sTiX2IV0DHu6Qz9Kf8pOOq2A:LLy2Kerc64CiGImbu6QBMUOOFA
TLSH
T17D435C176A559052C0BB52B0FC484F30823AACB405B7B213B389B65D1CB2E52DFB1DBE
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/0x00040000000170d5-3.dat	family_juko
behavioral2/files/0x000e00000001c5a3-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
680	WINWORD.exe
5192	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-1-5-21-2251218687-1689653882-3767565116-1000\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

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-13_c1045a257ed9e47713691fd2fc082bf2_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
5624	cmd.exe
4240	PING.EXE
3896	PING.EXE
3028	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4240	PING.EXE
3896	PING.EXE
3028	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4128 wrote to memory of 680	4128	2026-11-13_c1045a257ed9e47713691fd2fc082bf2_elex_wannacry.exe	89
PID 680 wrote to memory of 5624	680	WINWORD.exe	90
PID 5624 wrote to memory of 4240	5624	cmd.exe	92
PID 5624 wrote to memory of 3896	5624	cmd.exe	93
PID 5624 wrote to memory of 3028	5624	cmd.exe	94
PID 5624 wrote to memory of 5192	5624	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-13_c1045a257ed9e47713691fd2fc082bf2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-13_c1045a257ed9e47713691fd2fc082bf2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4128
- 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:680
- - 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\0000476F" 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:4240
  - - 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:3896
  - - 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:3028
  - - 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:5192

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

Replay Monitor

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Downloads

0000476F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000476F
Size 54KB
SHA256 9ecb74409b508036a0a6dc44a326ba0df2befa14cc025101ed9685a355b88fe0
MD5 dcb58ebf86af52ca06f33edf0bb0f9e9
SHA1 e93737656b78b1e29e664586d164ed816ac93cb4
SHA512 58464100884714a798a30b515457f4f1a9733603e176c660619fb8c8423fb86047c9c5a4dd5c69012bca892d0d88cb89adde0b2825320545f66e63836619217e
SSDEEP 1536:LLsF2Kerc64sTiX2IV0DHu6Qz9Kf8pOOq2X:LLy2Kerc64CiGImbu6QBMUOOFX
TLSH
T163435C176A559052C0BB52B0FC484F30823AADB405B7B213B389B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 54KB
SHA256 b2d305478428927f0f38d45efc74bf7f4a56d8e1d2270866b2e0ff5e764e4127
MD5 c1045a257ed9e47713691fd2fc082bf2
SHA1 e449fb9f569bdcac67a87d53aa4af79c1c9b2d79
SHA512 70e4cdcc667070e2684f49d0be5b41782cbeb60dec6573e23b8227eb3fa16b01dc21d7b025f2443fdca0963b724f7b93487576903a07f3bb698b68da08726a5c
SSDEEP 1536:LLsF2Kerc64sTiX2IV0DHu6Qz9Kf8pOOq2A:LLy2Kerc64CiGImbu6QBMUOOFA
TLSH
T17D435C176A559052C0BB52B0FC484F30823AACB405B7B213B389B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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