juko | 5e0445392f2125f09c87b911f26cc56808b0e5428189235e5f0084cdfb43bb70

General

Target
2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe
Size 117KB
Sample261018-ybcc2acd45
SHA256 5e0445392f2125f09c87b911f26cc56808b0e5428189235e5f0084cdfb43bb70
MD5 c6d5ac42a1f788de4759acaa56617afe
SHA1 a11c8ee2cc71c007f52f97aa29cbcb20dde26eb1
SHA512 ce3c3023879ca44ec43b82058dfdc23e94b99a59219a4d2cac46e4f1a26ae1b824a931896fa0061d33a32661986df41385df6e1492a504ccae64bc0c0b584fbd
SSDEEP 1536:oLsF2Kerc64sTiX2IV0DA1cr2jaFBZ0/v82:oLy2Kerc64CiGImU1m2j0u
TLSH
T1A0C34B2EB5A26068C55290B4E9EA3F31D4317C75012B752AA700BF252E76E23CF77D8D
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 8 IoCs

resource	yara_rule
behavioral1/memory/2076-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x001c000000023883-4.dat	family_juko
behavioral1/memory/5256-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2076-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5256-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024552-16.dat	family_juko
behavioral1/memory/1048-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1048-20-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5256	WINWORD.exe
1048	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-1-5-21-2091445952-3649787497-104050984-1000\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
5928	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	2026-10-17_c6d5ac42a1f788de4759acaa56617afe_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
1272	PING.EXE
5828	PING.EXE
3064	PING.EXE
5928	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3064	PING.EXE
1272	PING.EXE
5828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2076 wrote to memory of 5256	2076	2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe	86
PID 5256 wrote to memory of 5928	5256	WINWORD.exe	87
PID 5928 wrote to memory of 1272	5928	cmd.exe	89
PID 5928 wrote to memory of 5828	5928	cmd.exe	90
PID 5928 wrote to memory of 3064	5928	cmd.exe	93
PID 5928 wrote to memory of 1048	5928	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-17_c6d5ac42a1f788de4759acaa56617afe_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2076
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5256
- - 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\00000D08" 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:5928
  - - 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:1272
  - - 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:5828
  - - 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:3064
  - - 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:1048

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00000D08

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D08
Size 117KB
SHA256 8def045039c7cfd59a181dabe2ef3f8a6c2b7d5b9394b6a5daf92a7e3e783766
MD5 913cdc0c915669601a2b269c7e67578e
SHA1 892d592fa74f70bfb37328ef10fdf4d42c0ea92f
SHA512 bd1b8384e8de1c5fdca2999bd486fb38e02836ec2e0bc969ac27547f9aebb5c81e33387990b8176b5108b6d37632ac157117b5625760bd66c7b97326de8b4b21
SSDEEP 1536:oLsF2Kerc64sTiX2IV0DA1cr2jaFBZ0/v8P:oLy2Kerc64CiGImU1m2j0H
TLSH
T108C34B2EB5A26068C55290B4E9EA3F31D4317C75012B752AA700BF252D76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 117KB
SHA256 5e0445392f2125f09c87b911f26cc56808b0e5428189235e5f0084cdfb43bb70
MD5 c6d5ac42a1f788de4759acaa56617afe
SHA1 a11c8ee2cc71c007f52f97aa29cbcb20dde26eb1
SHA512 ce3c3023879ca44ec43b82058dfdc23e94b99a59219a4d2cac46e4f1a26ae1b824a931896fa0061d33a32661986df41385df6e1492a504ccae64bc0c0b584fbd
SSDEEP 1536:oLsF2Kerc64sTiX2IV0DA1cr2jaFBZ0/v82:oLy2Kerc64CiGImU1m2j0u
TLSH
T1A0C34B2EB5A26068C55290B4E9EA3F31D4317C75012B752AA700BF252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1048-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1048-20-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2076-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2076-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5256-11-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5256-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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