juko | 8cb376783194fc857fcab17f2807ff44f7a59b7bf2b51e279df0f8ba7dd9c8c7

General

Target
2026-08-04_4f915b9f8507e9e74e637a81739b031b_elex_wannacry.exe
Size 153KB
Sample260804-h6dxcafb65
SHA256 8cb376783194fc857fcab17f2807ff44f7a59b7bf2b51e279df0f8ba7dd9c8c7
MD5 4f915b9f8507e9e74e637a81739b031b
SHA1 d952dbec86874bb810076c0f1f83fd36b4e4a87a
SHA512 b712f24423302c3e359a51b2e286928b5431304cfbff0400d23adb478056f32773293885f9400a969a9286ba094f3610ea67bf0a784365c72cfe14d67578e9c3
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2g5:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZf
TLSH
T11DE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/4880-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b3a-5.dat	family_juko
behavioral2/memory/4880-9-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/936-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x001100000001c545-13.dat	family_juko
behavioral2/memory/1132-15-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/1132-16-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
936	WINWORD.exe
1132	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-1-5-21-3797332335-34111092-3597280141-1000\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
2628	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-04_4f915b9f8507e9e74e637a81739b031b_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
2628	cmd.exe
3180	PING.EXE
2560	PING.EXE
1296	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1296	PING.EXE
3180	PING.EXE
2560	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4880 wrote to memory of 936	4880	2026-08-04_4f915b9f8507e9e74e637a81739b031b_elex_wannacry.exe	89
PID 936 wrote to memory of 2628	936	WINWORD.exe	90
PID 2628 wrote to memory of 3180	2628	cmd.exe	92
PID 2628 wrote to memory of 2560	2628	cmd.exe	93
PID 2628 wrote to memory of 1296	2628	cmd.exe	94
PID 2628 wrote to memory of 1132	2628	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_4f915b9f8507e9e74e637a81739b031b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_4f915b9f8507e9e74e637a81739b031b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4880
- 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:936
- - 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\000029E6" 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:2628
  - - 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:3180
  - - 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:2560
  - - 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:1296
  - - 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:1132

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

000029E6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000029E6
Size 153KB
SHA256 2ce738be680e41e9e510a63ad99d307683d90f3650d8e8c939fd5b27b27c6238
MD5 99ae18c1464759b0789dc0eac2ed1433
SHA1 5d6d9a63cb5fdcab6cb23e335ea1d3313eba9613
SHA512 016289b45826cbe2f382bf180861e60c11288eaeadfa98e253f2c189563977f29ea74ab95695d0eb747ab3da490e09e9f5e1b448dde79b0c19bc45045bfd1c82
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gV:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZ7
TLSH
T1E3E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 8cb376783194fc857fcab17f2807ff44f7a59b7bf2b51e279df0f8ba7dd9c8c7
MD5 4f915b9f8507e9e74e637a81739b031b
SHA1 d952dbec86874bb810076c0f1f83fd36b4e4a87a
SHA512 b712f24423302c3e359a51b2e286928b5431304cfbff0400d23adb478056f32773293885f9400a969a9286ba094f3610ea67bf0a784365c72cfe14d67578e9c3
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2g5:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZf
TLSH
T11DE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/936-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/1132-15-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/1132-16-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4880-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4880-9-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads