juko | bece531db850d676f54f1ece11ca0bd92a21cd1d5e0756e9a6a6e99e7fdf5719

General

Target
2026-08-10_8a0b211235a7fd99813250fb5ed3eae4_elex_wannacry.exe
Size 40KB
Sample260810-l7ertaweqf
SHA256 bece531db850d676f54f1ece11ca0bd92a21cd1d5e0756e9a6a6e99e7fdf5719
MD5 8a0b211235a7fd99813250fb5ed3eae4
SHA1 315267a45020b9f55f3b9ed8e79dcaea5f7ac170
SHA512 f5d86bcb370438f1bb20c5da1ccf15d46258a7b9e29958dcd3d3eaac136858776f07a1a4fcdc8952a278c1be0d3f5a341e2c587f0cae91f5168835a3912f3f88
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7tos:rLsF2Kerc64sTiX2IV0DRGs
TLSH
T1EA032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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/0x000e00000001c466-4.dat	family_juko
behavioral2/files/0x000f00000001c467-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3300	WINWORD.exe
6032	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
5400	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_8a0b211235a7fd99813250fb5ed3eae4_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

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
5400	cmd.exe
4536	PING.EXE
4916	PING.EXE
800	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4536	PING.EXE
4916	PING.EXE
800	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2808 wrote to memory of 3300	2808	2026-08-10_8a0b211235a7fd99813250fb5ed3eae4_elex_wannacry.exe	89
PID 3300 wrote to memory of 5400	3300	WINWORD.exe	90
PID 5400 wrote to memory of 4536	5400	cmd.exe	92
PID 5400 wrote to memory of 4916	5400	cmd.exe	93
PID 5400 wrote to memory of 800	5400	cmd.exe	94
PID 5400 wrote to memory of 6032	5400	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_8a0b211235a7fd99813250fb5ed3eae4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_8a0b211235a7fd99813250fb5ed3eae4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2808
- 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:3300
- - 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\00007101" 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:5400
  - - 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:4536
  - - 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:4916
  - - 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:800
  - - 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:6032

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

00007101

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007101
Size 40KB
SHA256 5fa5ff7c16058739e2c266c2e197c627a807d1b3e6b5351345a541af00cacc93
MD5 edc6825bddca605a26d7139300cda85f
SHA1 c2f01c64a1cfce647b8a880c73570a80a2a239f8
SHA512 84822b67825036625ab5331796587090267263543b221b7e8211fc6d52b9ce69bc1261175d00a6ceac1e494ca2e2de670203e45cd6af317cf5a7443db45b8ddb
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7to0:rLsF2Kerc64sTiX2IV0DRG0
TLSH
T180032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 40KB
SHA256 bece531db850d676f54f1ece11ca0bd92a21cd1d5e0756e9a6a6e99e7fdf5719
MD5 8a0b211235a7fd99813250fb5ed3eae4
SHA1 315267a45020b9f55f3b9ed8e79dcaea5f7ac170
SHA512 f5d86bcb370438f1bb20c5da1ccf15d46258a7b9e29958dcd3d3eaac136858776f07a1a4fcdc8952a278c1be0d3f5a341e2c587f0cae91f5168835a3912f3f88
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7tos:rLsF2Kerc64sTiX2IV0DRGs
TLSH
T1EA032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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