juko | e3b5c5f33d8cfedfcee43d6e966c5964397e0e7cbc3cbe0d602b81ba7b1791ec

General

Target
2026-11-12_5fe8d155ce6819b04a6ecaac8da2b0c4_elex_wannacry.exe
Size 133KB
Sample261113-cd2vtayy2m
SHA256 e3b5c5f33d8cfedfcee43d6e966c5964397e0e7cbc3cbe0d602b81ba7b1791ec
MD5 5fe8d155ce6819b04a6ecaac8da2b0c4
SHA1 b7911cf3c1494c621b811418f7927e32840a01a9
SHA512 ada8cd3e78d68dc367919dc26e1e2d276fb53f8a033495ac039b32a731f05c3575d9c44521d541c46dd37725603cf2192615f978b456fc33e4d835d10edbec37
SSDEEP 3072:bLy2Kerc64CiGImIX9UQpx7NQ/zc2cQgVB:bLy2Kwc64YIF3gkX
TLSH
T185D32818A7F40135EAB74B70FDF1145286B3BD172E26DA6C1A85378D0933B41CA72B6B
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/0x000800000001b85a-3.dat	family_juko
behavioral2/files/0x000f00000001c4f1-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3864	WINWORD.exe
3332	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-1-5-21-1404337215-1550464601-2805570857-1000\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
4660	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\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	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	2026-11-12_5fe8d155ce6819b04a6ecaac8da2b0c4_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
3544	PING.EXE
4660	cmd.exe
1752	PING.EXE
6092	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1752	PING.EXE
6092	PING.EXE
3544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4848 wrote to memory of 3864	4848	2026-11-12_5fe8d155ce6819b04a6ecaac8da2b0c4_elex_wannacry.exe	88
PID 3864 wrote to memory of 4660	3864	WINWORD.exe	89
PID 4660 wrote to memory of 1752	4660	cmd.exe	91
PID 4660 wrote to memory of 6092	4660	cmd.exe	92
PID 4660 wrote to memory of 3544	4660	cmd.exe	93
PID 4660 wrote to memory of 3332	4660	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-11-12_5fe8d155ce6819b04a6ecaac8da2b0c4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-12_5fe8d155ce6819b04a6ecaac8da2b0c4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4848
- 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:3864
- - 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\000002F2" 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:4660
  - - 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:1752
  - - 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:6092
  - - 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:3544
  - - 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:3332

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

000002F2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000002F2
Size 133KB
SHA256 66df07f3784dcc18051fddf12520007d4362a0a3d00809dc5f802488e62ad3b9
MD5 581a9384b500f5af75aad0ca28936cc0
SHA1 e8e972c0902b955f287dc27e09f685ed793865f3
SHA512 ede86fb71a2edda1baf4d8bc30fd3cfb3e181be16bd6668b7b7df33f427f7d9286e207f89b6ff9685b34f0b9c7128efa71c901907272e89c7e3ad38a13fb66de
SSDEEP 3072:bLy2Kerc64CiGImIX9UQpx7NQ/zc2cQgVY:bLy2Kwc64YIF3gkW
TLSH
T1CFD32818A7F40135EAB74B70FDF1145286B3BD172E26DA6C1A85378D0933B41CA72B6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 133KB
SHA256 e3b5c5f33d8cfedfcee43d6e966c5964397e0e7cbc3cbe0d602b81ba7b1791ec
MD5 5fe8d155ce6819b04a6ecaac8da2b0c4
SHA1 b7911cf3c1494c621b811418f7927e32840a01a9
SHA512 ada8cd3e78d68dc367919dc26e1e2d276fb53f8a033495ac039b32a731f05c3575d9c44521d541c46dd37725603cf2192615f978b456fc33e4d835d10edbec37
SSDEEP 3072:bLy2Kerc64CiGImIX9UQpx7NQ/zc2cQgVB:bLy2Kwc64YIF3gkX
TLSH
T185D32818A7F40135EAB74B70FDF1145286B3BD172E26DA6C1A85378D0933B41CA72B6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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