juko | 98c78ee5f152501a34be88e463e51e2b11d86e2fa6655beb28ec175b237213ae

General

Target
2026-10-28_cdcf176de0568e3050fe9a0a74e932a7_elex_wannacry.exe
Size 216KB
Sample261029-wsehls119q
SHA256 98c78ee5f152501a34be88e463e51e2b11d86e2fa6655beb28ec175b237213ae
MD5 cdcf176de0568e3050fe9a0a74e932a7
SHA1 10085a27f6d80028936e85652233d8dc14f819a1
SHA512 02e30f1e92b497d4f4307614b85fb949b16de5a3b36de8a00290607b826159f403130ec1ba0f404164f750e3329f73e32ca4e8e83450dad26376cb9f0af85eb2
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgA:uLy2Kwc64YIcyjIDLCSiDaQ3
TLSH
T17B240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/1960-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b82c-4.dat	family_juko
behavioral2/memory/1960-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/1800-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x001200000001c43e-13.dat	family_juko
behavioral2/memory/2448-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/2448-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1800	WINWORD.exe
2448	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-1-5-21-4280978039-528710165-233981602-1000\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
4264	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-28_cdcf176de0568e3050fe9a0a74e932a7_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

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
4264	cmd.exe
1348	PING.EXE
2788	PING.EXE
1312	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2788	PING.EXE
1312	PING.EXE
1348	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1800	1960	2026-10-28_cdcf176de0568e3050fe9a0a74e932a7_elex_wannacry.exe	89
PID 1800 wrote to memory of 4264	1800	WINWORD.exe	90
PID 4264 wrote to memory of 1348	4264	cmd.exe	92
PID 4264 wrote to memory of 2788	4264	cmd.exe	93
PID 4264 wrote to memory of 1312	4264	cmd.exe	94
PID 4264 wrote to memory of 2448	4264	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-28_cdcf176de0568e3050fe9a0a74e932a7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_cdcf176de0568e3050fe9a0a74e932a7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1960
- 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:1800
- - 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\00005227" 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:4264
  - - 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:1348
  - - 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:2788
  - - 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:1312
  - - 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:2448

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

00005227

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005227
Size 216KB
SHA256 dc6ce0f40bab81fb3b666b02c52b0fd836eebad21d162dddcf285f02756442df
MD5 7086a1f596c6c094863aa1c788dc2c68
SHA1 f1dca61d791c9fd4cd483cf86cf4f7a5a5e82964
SHA512 5b82a8c2a29e805335f89d41e5ebfeed5253c5e12526c480be8a1db676f1253340414842236a2606b04360a41b51d0080dd9786ea2b813f773b8bd9f0ff45355
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgE:uLy2Kwc64YIcyjIDLCSiDaQf
TLSH
T1A8240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 216KB
SHA256 98c78ee5f152501a34be88e463e51e2b11d86e2fa6655beb28ec175b237213ae
MD5 cdcf176de0568e3050fe9a0a74e932a7
SHA1 10085a27f6d80028936e85652233d8dc14f819a1
SHA512 02e30f1e92b497d4f4307614b85fb949b16de5a3b36de8a00290607b826159f403130ec1ba0f404164f750e3329f73e32ca4e8e83450dad26376cb9f0af85eb2
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgA:uLy2Kwc64YIcyjIDLCSiDaQ3
TLSH
T17B240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1800-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1960-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1960-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2448-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2448-17-0x0000000000400000-0x0000000000436000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads