juko | 8a6ac5048691e41ad47c72b12c2dd1349a77d82d7a7a912a019990dcb63cfe44

General

Target
2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe
Size 95KB
Sample261027-qasdvsdf29
SHA256 8a6ac5048691e41ad47c72b12c2dd1349a77d82d7a7a912a019990dcb63cfe44
MD5 83c2a8f50f37678d55d89ef7caaf6ba3
SHA1 5cd083121537b0a9ce0f078948b0b8138b88744d
SHA512 03fdd6f42690040b003314df980c27dd23a96c549b2ef6dd5dc8fbc019fdf0774d8bb22fea03c612e0bc46d9f4956b896e5968c9d6abf6a9a66f3016aedf1725
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNy:ELy2Kerc64CiGImqRJshIPFJRAhP2EAe
TLSH
T19593BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
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/912-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001200000001b8aa-4.dat	family_juko
behavioral2/memory/912-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4912-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c583-13.dat	family_juko
behavioral2/memory/2700-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2700-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4912	WINWORD.exe
2700	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-1-5-21-4057491610-3392471755-192832105-1000\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
4308	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.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
4620	PING.EXE
4308	cmd.exe
1920	PING.EXE
5420	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1920	PING.EXE
5420	PING.EXE
4620	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 912 wrote to memory of 4912	912	2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe	90
PID 4912 wrote to memory of 4308	4912	WINWORD.exe	91
PID 4308 wrote to memory of 1920	4308	cmd.exe	93
PID 4308 wrote to memory of 5420	4308	cmd.exe	94
PID 4308 wrote to memory of 4620	4308	cmd.exe	95
PID 4308 wrote to memory of 2700	4308	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_83c2a8f50f37678d55d89ef7caaf6ba3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:912
- 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:4912
- - 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\00005E13" 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:4308
  - - 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:1920
  - - 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:5420
  - - 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:4620
  - - 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:2700

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005E13

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005E13
Size 95KB
SHA256 7ebe4438861f41bb6261c4ced38fc6d93f79cb672abfa934d29abccafe59c44f
MD5 b6704a4c12d4a16e36d3c2f4c02c3411
SHA1 c43032b82546d202b35ea2eb4b3b7d55ea4b95af
SHA512 97f8c4b35991c34a4208f4793743ec5c41bb04dd83cd9e8ba6f038129000e256278630bbd41b7067ca72f5bc0393395b8007087d1571d452044c9d15f6b9a192
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNA:ELy2Kerc64CiGImqRJshIPFJRAhP2EAE
TLSH
T1F393BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 8a6ac5048691e41ad47c72b12c2dd1349a77d82d7a7a912a019990dcb63cfe44
MD5 83c2a8f50f37678d55d89ef7caaf6ba3
SHA1 5cd083121537b0a9ce0f078948b0b8138b88744d
SHA512 03fdd6f42690040b003314df980c27dd23a96c549b2ef6dd5dc8fbc019fdf0774d8bb22fea03c612e0bc46d9f4956b896e5968c9d6abf6a9a66f3016aedf1725
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNy:ELy2Kerc64CiGImqRJshIPFJRAhP2EAe
TLSH
T19593BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/912-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/912-9-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/2700-16-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/2700-17-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/4912-12-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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