juko | 20b335d3812ccbaaf44ec98fa011d6dee4e6d2d6126e9450f1eb95a64fcd0016

General

Target
2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe
Size 49KB
Sample261026-rb7evabc42
SHA256 20b335d3812ccbaaf44ec98fa011d6dee4e6d2d6126e9450f1eb95a64fcd0016
MD5 bd93571979992fd4c762172999f9b7c4
SHA1 bbfa7f7daf4e79088c20f7879e7291a900b2ad7f
SHA512 1805ef2383183f6921b4bdbd2a5651563f76a90fdbb0a48939f70fc2d66e8a174c4d60f50a8abd807dc1e135305408477f4ab815bd78b42aed97622788156da2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:VLy2Kerc64CiGImVu8p4kojWh2I
TLSH
T163334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3292-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000600000000053e-4.dat	family_juko
behavioral2/memory/3292-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4424-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0008000000016b3a-13.dat	family_juko
behavioral2/memory/4372-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4372-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4424	WINWORD.exe
4372	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-1-5-21-4154726816-2055034831-2297277433-1000\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
5804	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	2026-10-25_bd93571979992fd4c762172999f9b7c4_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
6080	PING.EXE
1984	PING.EXE
5804	cmd.exe
4244	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4244	PING.EXE
6080	PING.EXE
1984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3292 wrote to memory of 4424	3292	2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe	89
PID 4424 wrote to memory of 5804	4424	WINWORD.exe	90
PID 5804 wrote to memory of 4244	5804	cmd.exe	92
PID 5804 wrote to memory of 6080	5804	cmd.exe	93
PID 5804 wrote to memory of 1984	5804	cmd.exe	94
PID 5804 wrote to memory of 4372	5804	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd93571979992fd4c762172999f9b7c4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3292
- 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:4424
- - 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\00001DD0" 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:5804
  - - 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:4244
  - - 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:6080
  - - 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:1984
  - - 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:4372

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

00001DD0

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001DD0
Size 49KB
SHA256 59f1d58d6c394982dc4a3076236caf9729d763de4ffa8106a19bfb4f47dc85f4
MD5 8070bd2bfbd5f7babfe57b4912478803
SHA1 a0c9d760a247c3770fa638e99d0d9f475d73288d
SHA512 b42bb1319e673cbd4cc1f22770ee761c2251ea2b4b89ae0289beacc68cfb0609251e2a9261a5571c1973ba80f454d1fda99f809e1f1ca9d4f0e1cb7c23f30a8e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2h:VLy2Kerc64CiGImVu8p4kojWh2h
TLSH
T199334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 20b335d3812ccbaaf44ec98fa011d6dee4e6d2d6126e9450f1eb95a64fcd0016
MD5 bd93571979992fd4c762172999f9b7c4
SHA1 bbfa7f7daf4e79088c20f7879e7291a900b2ad7f
SHA512 1805ef2383183f6921b4bdbd2a5651563f76a90fdbb0a48939f70fc2d66e8a174c4d60f50a8abd807dc1e135305408477f4ab815bd78b42aed97622788156da2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:VLy2Kerc64CiGImVu8p4kojWh2I
TLSH
T163334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3292-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3292-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4372-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4372-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4424-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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