juko | 407aa614b00eb980b4bd47fadb76c35abfb9faa5a1ad9d1c928c29a9ce55f7fa

Analysis

max time kernel
149s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
22/04/2026, 02:58

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General

Target
2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe
Size 87KB
Sample260422-dgd4labx71
SHA256 407aa614b00eb980b4bd47fadb76c35abfb9faa5a1ad9d1c928c29a9ce55f7fa
MD5 5c1d9fbcffb0b0a0ba45966d49bbfe39
SHA1 baa1cbb5306654b30d26d05d3a23c12052a3a0ed
SHA512 301504b9c19f44e8e2c31b1a3926ee6288df6f1cecd3eda8c583c7a50c22d6ad3451b33e519b3cba12d3601a2528e6850a7358114ca379fa449c2f79ef90b09d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpT:2Ly2Kerc64CiGIm1K851YO6EQkwpT
TLSH
T16793A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4924-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000800000000d3ef-5.dat	family_juko
behavioral2/memory/4924-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/416-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3a6-17.dat	family_juko
behavioral2/memory/996-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/996-20-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
416	WINWORD.exe
996	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-1-5-21-1383858298-2057492509-1726743289-1000\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	2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_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
2392	PING.EXE
2036	PING.EXE
5068	PING.EXE
2744	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2392	PING.EXE
2036	PING.EXE
5068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4924 wrote to memory of 416	4924	2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe	80
PID 416 wrote to memory of 2744	416	WINWORD.exe	81
PID 2744 wrote to memory of 2392	2744	cmd.exe	83
PID 2744 wrote to memory of 2036	2744	cmd.exe	84
PID 2744 wrote to memory of 5068	2744	cmd.exe	85
PID 2744 wrote to memory of 996	2744	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4924
- 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:416
- - 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\00000BC2" 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:2744
  - - 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:2392
  - - 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:2036
  - - 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:5068
  - - 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:996

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

00000BC2

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000BC2
Size 87KB
SHA256 7bbd9a4aa06cf2fe69632e4b262d48382829fb0c42cbceba56c2d15bf5eb79de
MD5 5005d3c5ce2082d6c9d5142c7a970a13
SHA1 977d6bd8020a0680b7bfed3acc61b9a537d5b910
SHA512 fc7f0309ec3594f0f7d3536bb64e11609ebf06391fc5cae5f192bfc370eeb174ecbd922014aa4a81ae9aa4c4d7eba3b701f6b1763220413aa8bc177d479fabb1
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp2:2Ly2Kerc64CiGIm1K851YO6EQkwp2
TLSH
T1F993A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 407aa614b00eb980b4bd47fadb76c35abfb9faa5a1ad9d1c928c29a9ce55f7fa
MD5 5c1d9fbcffb0b0a0ba45966d49bbfe39
SHA1 baa1cbb5306654b30d26d05d3a23c12052a3a0ed
SHA512 301504b9c19f44e8e2c31b1a3926ee6288df6f1cecd3eda8c583c7a50c22d6ad3451b33e519b3cba12d3601a2528e6850a7358114ca379fa449c2f79ef90b09d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpT:2Ly2Kerc64CiGIm1K851YO6EQkwpT
TLSH
T16793A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/416-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/416-15-0x0000000002660000-0x00000000027AD000-memory.dmp

Download

memory/996-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/996-20-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4924-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4924-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4924-11-0x00000000025E0000-0x000000000272D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads