juko | 2a50a8b30ce8c6e73a1bb8b7aad6bc1c4a44cf9c80b8a41bfe32af72da24c3df

General

Target
2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe
Size 42KB
Sample261023-ef52cswthv
SHA256 2a50a8b30ce8c6e73a1bb8b7aad6bc1c4a44cf9c80b8a41bfe32af72da24c3df
MD5 ec5a644aa3b3795fe9234e20555add8c
SHA1 c2dd65a1bcc490a885156542645de4468cd74bfd
SHA512 a87fc188a64e68c958e51793696a6d736e4645640fef139e42965e801ed541a8f28aa65169efb7440bf342ea9d2c8b38c16e7c13f883cedef3eebd7101a221f7
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41Y:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+f
TLSH
T19D13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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/0x000700000001b857-3.dat	family_juko
behavioral2/files/0x000e00000001c4b9-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2428	WINWORD.exe
2232	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
4304	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	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	2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.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
4304	cmd.exe
4856	PING.EXE
5936	PING.EXE
1812	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4856	PING.EXE
5936	PING.EXE
1812	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5100 wrote to memory of 2428	5100	2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe	89
PID 2428 wrote to memory of 4304	2428	WINWORD.exe	90
PID 4304 wrote to memory of 4856	4304	cmd.exe	92
PID 4304 wrote to memory of 5936	4304	cmd.exe	93
PID 4304 wrote to memory of 1812	4304	cmd.exe	94
PID 4304 wrote to memory of 2232	4304	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_ec5a644aa3b3795fe9234e20555add8c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5100
- 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:2428
- - 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\0000173F" 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:4304
  - - 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:4856
  - - 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:5936
  - - 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:1812
  - - 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:2232

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

0000173F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000173F
Size 42KB
SHA256 3d2a4cbb011e51715909dc44a8a546341553711c846849d7a3319047f236041e
MD5 2717172ca87792427b26d75f850f0b28
SHA1 28d20ec386e464d792098c8d5eacaf510d83bea9
SHA512 8e750993ce91814ae4cc99fea44ec191d4d29b29a10cfa615c5aa59a000cd41eb5cd03d9392839e07c6f95f6d76547a282505591b6c4ac2dd210cff9b5660f34
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41g:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+3
TLSH
T1AE13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 2a50a8b30ce8c6e73a1bb8b7aad6bc1c4a44cf9c80b8a41bfe32af72da24c3df
MD5 ec5a644aa3b3795fe9234e20555add8c
SHA1 c2dd65a1bcc490a885156542645de4468cd74bfd
SHA512 a87fc188a64e68c958e51793696a6d736e4645640fef139e42965e801ed541a8f28aa65169efb7440bf342ea9d2c8b38c16e7c13f883cedef3eebd7101a221f7
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41Y:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+f
TLSH
T19D13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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