juko | b63040ce8bf0a0c2e3fa36fc1ffe9301e4741f6eede1d7ac22242bb0f4756857

General

Target
2026-08-04_285566570a445030d9766ee5e926e69b_elex_wannacry.exe
Size 153KB
Sample260804-jt2cjsff84
SHA256 b63040ce8bf0a0c2e3fa36fc1ffe9301e4741f6eede1d7ac22242bb0f4756857
MD5 285566570a445030d9766ee5e926e69b
SHA1 5dbee8dbf643bcc3dde4b4d205470d8334ac3abb
SHA512 6af69cc42d335db5e69bb0555c77c8c07c25ba224a463d6247052a447dac63d1169f5e7e566be16db86b24850bcdeda0309c884bd6a16ebff81c482c8b6e7d3a
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gE:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZi
TLSH
T155E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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 7 IoCs

resource	yara_rule
behavioral2/memory/3156-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x001200000001b671-5.dat	family_juko
behavioral2/memory/3156-10-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/5956-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c549-13.dat	family_juko
behavioral2/memory/1352-15-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/1352-16-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5956	WINWORD.exe
1352	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-1-5-21-3611646547-550105268-947503007-1000\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
3896	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	2026-08-04_285566570a445030d9766ee5e926e69b_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
2440	PING.EXE
3160	PING.EXE
3896	cmd.exe
5728	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5728	PING.EXE
2440	PING.EXE
3160	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3156 wrote to memory of 5956	3156	2026-08-04_285566570a445030d9766ee5e926e69b_elex_wannacry.exe	89
PID 5956 wrote to memory of 3896	5956	WINWORD.exe	90
PID 3896 wrote to memory of 5728	3896	cmd.exe	92
PID 3896 wrote to memory of 2440	3896	cmd.exe	93
PID 3896 wrote to memory of 3160	3896	cmd.exe	94
PID 3896 wrote to memory of 1352	3896	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_285566570a445030d9766ee5e926e69b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_285566570a445030d9766ee5e926e69b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3156
- 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:5956
- - 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\00003493" 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: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:5728
  - - 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:2440
  - - 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:3160
  - - 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:1352

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

00003493

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003493
Size 153KB
SHA256 9062b692354aad2ae8e7d32ac70da3ae0d685d2657396ea71287f71d371e5d5f
MD5 f7425a751ede195087f4f233a7d22357
SHA1 94a134e7e5001f25821a2dcfd59ad8f06a6f359c
SHA512 942206cc35e60651edd8c7c6af88d53cdaa9d8a14f3db61534ebfb267a12d8b3c1a14fba4ae63ee2e7b04d590b8f2e41e532492284ac4fe2c9ed372bc8195910
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2g8:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZu
TLSH
T1AEE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 b63040ce8bf0a0c2e3fa36fc1ffe9301e4741f6eede1d7ac22242bb0f4756857
MD5 285566570a445030d9766ee5e926e69b
SHA1 5dbee8dbf643bcc3dde4b4d205470d8334ac3abb
SHA512 6af69cc42d335db5e69bb0555c77c8c07c25ba224a463d6247052a447dac63d1169f5e7e566be16db86b24850bcdeda0309c884bd6a16ebff81c482c8b6e7d3a
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gE:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZi
TLSH
T155E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1352-15-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/1352-16-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3156-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3156-10-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/5956-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads