juko | 6d1713b387148afc7eafce69cb8f2696d3e0e65fc0bc28da49c844479e4ed3a5

General

Target
2026-10-26_7a4ae6deb0640b3b0b154b8ee88ce682_elex_wannacry.exe
Size 86KB
Sample261027-rap46sss5r
SHA256 6d1713b387148afc7eafce69cb8f2696d3e0e65fc0bc28da49c844479e4ed3a5
MD5 7a4ae6deb0640b3b0b154b8ee88ce682
SHA1 5d17880f2dc7405cb39c8acac308722a11e5f644
SHA512 fe3a41a06a29494e90b8889823a6bd9d6097152805c043692f9d7c32d9ad1a35d1dda13ae7a91c81901f0ebf17c7bd6f6f5ed926727beb8d266e353173907aa7
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpe:vLy2Kerc64CiGImMPu/ouEQkwpe
TLSH
T1B583C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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/4580-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f000000016a66-4.dat	family_juko
behavioral2/memory/4580-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2588-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0003000000000434-13.dat	family_juko
behavioral2/memory/6080-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/6080-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2588	WINWORD.exe
6080	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-1-5-21-696679853-3915825385-3233721679-1000\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
4604	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	2026-10-26_7a4ae6deb0640b3b0b154b8ee88ce682_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
4604	cmd.exe
5256	PING.EXE
4780	PING.EXE
2936	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2936	PING.EXE
5256	PING.EXE
4780	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4580 wrote to memory of 2588	4580	2026-10-26_7a4ae6deb0640b3b0b154b8ee88ce682_elex_wannacry.exe	90
PID 2588 wrote to memory of 4604	2588	WINWORD.exe	91
PID 4604 wrote to memory of 5256	4604	cmd.exe	93
PID 4604 wrote to memory of 4780	4604	cmd.exe	94
PID 4604 wrote to memory of 2936	4604	cmd.exe	95
PID 4604 wrote to memory of 6080	4604	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-26_7a4ae6deb0640b3b0b154b8ee88ce682_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_7a4ae6deb0640b3b0b154b8ee88ce682_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4580
- 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:2588
- - 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\00006126" 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:4604
  - - 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:5256
  - - 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:4780
  - - 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:2936
  - - 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:6080

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

Replay Monitor

Loading Replay Monitor...

Downloads

00006126

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006126
Size 86KB
SHA256 ab352a2a1bfd8a14545dcc1956cb5fe16842c70a13a2fab0226cc8047215a866
MD5 e0e84b2adc3da5a1fe2f9f95f6a82209
SHA1 abccca74f40a8b0c71fbf2c86b13b5acda3bf636
SHA512 9eb5203c0d168cf1741cba2e4c99cb7d6be0d6bc562917ee83c0c6dfe9262fafc5821b2c756cd630d58807336733d34972b0e41c006658eb5d8c8780b969724f
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp2:vLy2Kerc64CiGImMPu/ouEQkwp2
TLSH
T17283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 6d1713b387148afc7eafce69cb8f2696d3e0e65fc0bc28da49c844479e4ed3a5
MD5 7a4ae6deb0640b3b0b154b8ee88ce682
SHA1 5d17880f2dc7405cb39c8acac308722a11e5f644
SHA512 fe3a41a06a29494e90b8889823a6bd9d6097152805c043692f9d7c32d9ad1a35d1dda13ae7a91c81901f0ebf17c7bd6f6f5ed926727beb8d266e353173907aa7
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpe:vLy2Kerc64CiGImMPu/ouEQkwpe
TLSH
T1B583C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2588-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4580-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4580-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6080-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6080-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads