juko | e10d39092574cb12e164e523f4e20f091979be032d904700d7c4b80cf157e757

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
21/04/2026, 03:38

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General

Target
2026-04-21_516f34b0b78af2f9b3030a40679e1968_elex_wannacry.exe
Size 87KB
Sample260421-d65ylsa19x
SHA256 e10d39092574cb12e164e523f4e20f091979be032d904700d7c4b80cf157e757
MD5 516f34b0b78af2f9b3030a40679e1968
SHA1 890d7320916d120168f7185b9271a3eba5f53a1d
SHA512 88170359ac8358950dee77889a49cbb31648e3721a0e6b5051bac73821c2fbc6cc7e468f367da1efa4c382faa8ba1b02708868d1c054e6099d76500ea9664269
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpi:2Ly2Kerc64CiGIm1K851YO6EQkwpi
TLSH
T1A893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/2564-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000a00000002a94d-5.dat	family_juko
behavioral2/memory/2564-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4332-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b4ab-17.dat	family_juko
behavioral2/memory/4112-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4112-21-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4332	WINWORD.exe
4112	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-1-5-21-2397528088-2630719772-1129911217-1000\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	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	2026-04-21_516f34b0b78af2f9b3030a40679e1968_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

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
3716	cmd.exe
5596	PING.EXE
5644	PING.EXE
1092	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5596	PING.EXE
5644	PING.EXE
1092	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2564 wrote to memory of 4332	2564	2026-04-21_516f34b0b78af2f9b3030a40679e1968_elex_wannacry.exe	79
PID 4332 wrote to memory of 3716	4332	WINWORD.exe	80
PID 3716 wrote to memory of 5596	3716	cmd.exe	82
PID 3716 wrote to memory of 5644	3716	cmd.exe	83
PID 3716 wrote to memory of 1092	3716	cmd.exe	84
PID 3716 wrote to memory of 4112	3716	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-21_516f34b0b78af2f9b3030a40679e1968_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-21_516f34b0b78af2f9b3030a40679e1968_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2564
- 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:4332
- - 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\00003CE9" 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:3716
  - - 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:5596
  - - 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:5644
  - - 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:1092
  - - 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:4112

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

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Downloads

00003CE9

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003CE9
Size 87KB
SHA256 661ba0f7bc8322817fda36d074222f0cb30280a07777b7f5a1daca628eb48467
MD5 747e2a82d4cce7eb133036b9d9b1dffe
SHA1 6cb3229fed23e94bae5169975afd4843f40c6c84
SHA512 9e2bdca0e31dc34efcd2ff8363dcf6692fcee1e0706648d38916412d4e11d45e7629218e862eab612f48d65b466ef2d0185beb4decf419e719eb7a236e86294c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp9:2Ly2Kerc64CiGIm1K851YO6EQkwp9
TLSH
T1F693A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 e10d39092574cb12e164e523f4e20f091979be032d904700d7c4b80cf157e757
MD5 516f34b0b78af2f9b3030a40679e1968
SHA1 890d7320916d120168f7185b9271a3eba5f53a1d
SHA512 88170359ac8358950dee77889a49cbb31648e3721a0e6b5051bac73821c2fbc6cc7e468f367da1efa4c382faa8ba1b02708868d1c054e6099d76500ea9664269
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpi:2Ly2Kerc64CiGIm1K851YO6EQkwpi
TLSH
T1A893A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2564-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2564-12-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/2564-11-0x0000000000890000-0x000000000090C000-memory.dmp

Download

memory/4112-19-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4112-20-0x0000000000990000-0x0000000000A0C000-memory.dmp

Download

memory/4112-21-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4332-16-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4332-15-0x00000000009E0000-0x0000000000A5C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads