juko | 1c43ff247df1ce0184aa523cbea5de409b83edea77159c604ed02d74bb0c46f3

Analysis

max time kernel
149s
max time network
140s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
06/05/2026, 07:51

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
2026-05-06_d6f1f91812f9a40b9513148cb04c7354_elex_wannacry.exe
Size 49KB
Sample260506-jp8aasds3t
SHA256 1c43ff247df1ce0184aa523cbea5de409b83edea77159c604ed02d74bb0c46f3
MD5 d6f1f91812f9a40b9513148cb04c7354
SHA1 761b895476efb49e5b0cfa8d670dedb9a3a140c8
SHA512 6150423ea76cabe33fa723daca508bd3a3ca69c2939d0d75978f0449c9cdd42c685bf3d162428eb0ff1d81ee1e1ce632355b1a25a388a413a56d9cac456ea3f6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:4Ly2Kerc64CiGImVu8p4kojWh2P
TLSH
T170334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/3680-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d0000000259a4-5.dat	family_juko
behavioral2/memory/3680-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4384-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3cf-17.dat	family_juko
behavioral2/memory/4548-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4548-21-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4384	WINWORD.exe
4548	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-1-5-21-3119821332-640943685-2562343641-1000\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

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	2026-05-06_d6f1f91812f9a40b9513148cb04c7354_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
2960	cmd.exe
3516	PING.EXE
3016	PING.EXE
3672	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3516	PING.EXE
3016	PING.EXE
3672	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 4384	3680	2026-05-06_d6f1f91812f9a40b9513148cb04c7354_elex_wannacry.exe	79
PID 4384 wrote to memory of 2960	4384	WINWORD.exe	80
PID 2960 wrote to memory of 3516	2960	cmd.exe	82
PID 2960 wrote to memory of 3016	2960	cmd.exe	83
PID 2960 wrote to memory of 3672	2960	cmd.exe	84
PID 2960 wrote to memory of 4548	2960	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-06_d6f1f91812f9a40b9513148cb04c7354_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-06_d6f1f91812f9a40b9513148cb04c7354_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3680
- 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:4384
- - 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\00002550" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2960
  - - 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:3516
  - - 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:3016
  - - 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:3672
  - - 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
      System Location Discovery: System Language Discovery
      PID:4548

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

00002550

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002550
Size 49KB
SHA256 e8fa9da9ebdcb43143af62cf4639df80f4a59490e7df2a71c41f5ae035c6f7a5
MD5 fd20f59e66d318e60a556f67a9619e23
SHA1 0b561149fb78381d7792c28fa68e6497fd2521a1
SHA512 70350dcd72387ec6a3a7bad58ecd988899b49ed217226abbf1a43f23bb67ba616dc80501651460c9bc2d28d7b76aed2db02633ad6cc8adeddfca4e0021c79e03
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2l:4Ly2Kerc64CiGImVu8p4kojWh2l
TLSH
T157334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1c43ff247df1ce0184aa523cbea5de409b83edea77159c604ed02d74bb0c46f3
MD5 d6f1f91812f9a40b9513148cb04c7354
SHA1 761b895476efb49e5b0cfa8d670dedb9a3a140c8
SHA512 6150423ea76cabe33fa723daca508bd3a3ca69c2939d0d75978f0449c9cdd42c685bf3d162428eb0ff1d81ee1e1ce632355b1a25a388a413a56d9cac456ea3f6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:4Ly2Kerc64CiGImVu8p4kojWh2P
TLSH
T170334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3680-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3680-12-0x00000000009B0000-0x0000000000A2B000-memory.dmp

Download

memory/3680-13-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4384-15-0x0000000000670000-0x00000000006EB000-memory.dmp

Download

memory/4384-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4548-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4548-21-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4548-20-0x0000000000640000-0x00000000006BB000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads