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
behavioral1/files/0x00090000000233f1-3.dat	family_juko
behavioral1/files/0x0008000000024553-12.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-681733028-2344970462-962213935-1000\Control Panel\International\Geo\Nation	2026-11-13_c1045a257ed9e47713691fd2fc082bf2_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-681733028-2344970462-962213935-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5776	WINWORD.exe
1608	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-1-5-21-681733028-2344970462-962213935-1000\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
5800	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	2026-11-13_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

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
4304	PING.EXE
5508	PING.EXE
5800	cmd.exe
3712	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3712	PING.EXE
4304	PING.EXE
5508	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4216 wrote to memory of 5776	4216	2026-11-13_c1045a257ed9e47713691fd2fc082bf2_elex_wannacry.exe	85
PID 5776 wrote to memory of 5800	5776	WINWORD.exe	86
PID 5800 wrote to memory of 3712	5800	cmd.exe	88
PID 5800 wrote to memory of 4304	5800	cmd.exe	89
PID 5800 wrote to memory of 5508	5800	cmd.exe	91
PID 5800 wrote to memory of 1608	5800	cmd.exe	92

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4216
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5776
- - 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\00007A74" 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:5800
  - - 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:3712
  - - 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:4304
  - - 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:5508
  - - 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:1608

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00007A74

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A74
Size 54KB
SHA256 ec228b56e86100366d0be36985f5ad3ae597dd4974a6c33614f6139bf0515e99
MD5 15e76a7af9f69aec85f2b3c61c371b8b
SHA1 2d19731d81fc38533490b172b9942235c868f84b
SHA512 21eeaf4c362d8c310061597aadd75b98c8b7a7804b74eb6ebc4df274fcdcf22b5c2e0dde11da581f1a1ad898574a58ee9f5fbc82d193122c915b800feacff76a
SSDEEP 1536:LLsF2Kerc64sTiX2IV0DHu6Qz9Kf8pOOq2A:LLy2Kerc64CiGImbu6QBMUOOFA
TLSH
T1D0435C176A559052C0BB52B0FC484F30823AACB405B7B213B389B65D1CB2E52DFB1DBE
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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Downloads