juko | 8cb17428806faff62d6bcc97d65b1bcd3bb50e6047d80b71a6da15c9420cefa0

General

Target
2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe
Size 94KB
Sample260802-exdcnsvbkb
SHA256 8cb17428806faff62d6bcc97d65b1bcd3bb50e6047d80b71a6da15c9420cefa0
MD5 2f8c76ccdd3d74b08a5f5544ca55efb9
SHA1 1e40f4ff21c24f304d9596596f0540f540d95f4d
SHA512 2b3d41c0815d958e12805b9553c287b3d97b62b95256175cd88f993877d520a3751288b41ba3d00570447810b7de01ddc6f5b728feb8e50788abedf82de0c5c9
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/No:RLy2Kerc64CiGImFYgUBWTb4/No
TLSH
T142937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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 8 IoCs

resource	yara_rule
behavioral1/memory/4956-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00100000000231f3-5.dat	family_juko
behavioral1/memory/3536-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4956-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/3536-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00090000000245f8-16.dat	family_juko
behavioral1/memory/1616-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/1616-19-0x0000000000400000-0x000000000042B000-memory.dmp	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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3536	WINWORD.exe
1616	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-1-5-21-3053180483-1881419501-3594244048-1000\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
4232	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	2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_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
4232	cmd.exe
4952	PING.EXE
4464	PING.EXE
1660	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4952	PING.EXE
4464	PING.EXE
1660	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4956 wrote to memory of 3536	4956	2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe	84
PID 3536 wrote to memory of 4232	3536	WINWORD.exe	85
PID 4232 wrote to memory of 4952	4232	cmd.exe	87
PID 4232 wrote to memory of 4464	4232	cmd.exe	89
PID 4232 wrote to memory of 1660	4232	cmd.exe	90
PID 4232 wrote to memory of 1616	4232	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_2f8c76ccdd3d74b08a5f5544ca55efb9_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4956
- 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:3536
- - 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\00003BDF" 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:4232
  - - 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:4952
  - - 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:4464
  - - 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:1660
  - - 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:1616

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003BDF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BDF
Size 94KB
SHA256 f32a16d4c03fda78614bbebb424da148a9ebb3500004d992e32df87b42f00fe4
MD5 6bc6a7185e4f325fcd07c9c3e0f626ef
SHA1 5dbc2c628873166951bc9663e6011a2ee7e7d903
SHA512 336218032c420ca0a0cb8c306a8c441b20fbc6eace8a418e72ebb0d0d7937e3b98b02d4fa489d8d4b5ac03938ffa08f423b23bfcacd7096d3e0fa44054758b36
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nt:RLy2Kerc64CiGImFYgUBWTb4/Nt
TLSH
T1C7937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 8cb17428806faff62d6bcc97d65b1bcd3bb50e6047d80b71a6da15c9420cefa0
MD5 2f8c76ccdd3d74b08a5f5544ca55efb9
SHA1 1e40f4ff21c24f304d9596596f0540f540d95f4d
SHA512 2b3d41c0815d958e12805b9553c287b3d97b62b95256175cd88f993877d520a3751288b41ba3d00570447810b7de01ddc6f5b728feb8e50788abedf82de0c5c9
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/No:RLy2Kerc64CiGImFYgUBWTb4/No
TLSH
T142937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1616-18-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/1616-19-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/3536-12-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/3536-15-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/4956-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4956-13-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads