juko | 6c840dd0f0237a607afd47c4b86a875ada98e884304804a3b96fa5ccc0ad2546

General

Target
2026-10-26_72c8d7dd4da9dcb1bcb52aefe49e4a20_elex_wannacry.exe
Size 32KB
Sample261027-ryencady4t
SHA256 6c840dd0f0237a607afd47c4b86a875ada98e884304804a3b96fa5ccc0ad2546
MD5 72c8d7dd4da9dcb1bcb52aefe49e4a20
SHA1 a4c246f54ec3bd14830ce3212b0933921c819436
SHA512 eee870a574feaa68b4c18cad40fe6cf1c4c3e1ec5826d6b39120ffacb4d94d950183dea79655879159624a588ca32dd2d3edc23d31863695737b0cdae94c1001
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfS:tLsF2Kerc64sTiX2IV0DYQq
TLSH
T166E23B2B6AA17052C59320F0F9592F34C43D9DB5116BB062F7417B6928B2D63CF71ACE
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/0x0008000000011392-3.dat	family_juko
behavioral2/files/0x000c00000001b872-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1872	WINWORD.exe
4572	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-1-5-21-461973139-3212354679-1508698038-1000\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
5796	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	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_72c8d7dd4da9dcb1bcb52aefe49e4a20_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

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
4640	PING.EXE
5600	PING.EXE
6088	PING.EXE
5796	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5600	PING.EXE
6088	PING.EXE
4640	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5588 wrote to memory of 1872	5588	2026-10-26_72c8d7dd4da9dcb1bcb52aefe49e4a20_elex_wannacry.exe	89
PID 1872 wrote to memory of 5796	1872	WINWORD.exe	90
PID 5796 wrote to memory of 4640	5796	cmd.exe	92
PID 5796 wrote to memory of 5600	5796	cmd.exe	93
PID 5796 wrote to memory of 6088	5796	cmd.exe	94
PID 5796 wrote to memory of 4572	5796	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_72c8d7dd4da9dcb1bcb52aefe49e4a20_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_72c8d7dd4da9dcb1bcb52aefe49e4a20_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5588
- 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:1872
- - 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\00006521" 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:5796
  - - 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:4640
  - - 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:5600
  - - 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:6088
  - - 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:4572

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

00006521

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006521
Size 32KB
SHA256 a231637c867893f79264d502b6287e3e8e476bdb2ffc22b82440f3fbdaed51e9
MD5 b5d230f4c039579116541e1f78a604ac
SHA1 d1b938dc2f102d7cf12e8659551313cb8121bf53
SHA512 e25aa8045590c57ec51109a9ead98e4810ad4eac2f6fb6228bffe5237722ffb4bac28608aa730cb88a3d95fc6600539a2cd33de8f497144cf056bfb0ea1cb346
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfC:tLsF2Kerc64sTiX2IV0DYQ6
TLSH
T10DE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 6c840dd0f0237a607afd47c4b86a875ada98e884304804a3b96fa5ccc0ad2546
MD5 72c8d7dd4da9dcb1bcb52aefe49e4a20
SHA1 a4c246f54ec3bd14830ce3212b0933921c819436
SHA512 eee870a574feaa68b4c18cad40fe6cf1c4c3e1ec5826d6b39120ffacb4d94d950183dea79655879159624a588ca32dd2d3edc23d31863695737b0cdae94c1001
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfS:tLsF2Kerc64sTiX2IV0DYQq
TLSH
T166E23B2B6AA17052C59320F0F9592F34C43D9DB5116BB062F7417B6928B2D63CF71ACE
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