juko | 832d0551db44d7641c1deafb03d9bd761f970caba3f9d5452b4cfff89082767f

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
10/05/2026, 00:29

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General

Target
2026-05-09_f37eb1b161242f79fd413a760a89c535_elex_wannacry.exe
Size 88KB
Sample260510-as9svsft2x
SHA256 832d0551db44d7641c1deafb03d9bd761f970caba3f9d5452b4cfff89082767f
MD5 f37eb1b161242f79fd413a760a89c535
SHA1 248d6cca65e397934e0b7a243877b1793754d4a4
SHA512 de2746b615c2d2bbdfdb4c11ca76cc79b3a2c584c919c9a17ced5f64eab64fe66e416518a44738bad848354e409ec0604a3de18f9f66a05b36ff4fee52d9242b
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsk:zLy2Kerc64CiGImHc/28wzCBlycJWee/
TLSH
T10D933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4808-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000a00000002a117-5.dat	family_juko
behavioral2/memory/4808-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5908-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b3ed-17.dat	family_juko
behavioral2/memory/5176-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5176-28-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5908	WINWORD.exe
5176	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-1-5-21-1456842261-3464001825-2855069093-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-09_f37eb1b161242f79fd413a760a89c535_elex_wannacry.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
4380	cmd.exe
1124	PING.EXE
4184	PING.EXE
4372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1124	PING.EXE
4184	PING.EXE
4372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 5908	4808	2026-05-09_f37eb1b161242f79fd413a760a89c535_elex_wannacry.exe	79
PID 5908 wrote to memory of 4380	5908	WINWORD.exe	80
PID 4380 wrote to memory of 1124	4380	cmd.exe	82
PID 4380 wrote to memory of 4184	4380	cmd.exe	83
PID 4380 wrote to memory of 4372	4380	cmd.exe	84
PID 4380 wrote to memory of 5176	4380	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-09_f37eb1b161242f79fd413a760a89c535_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-09_f37eb1b161242f79fd413a760a89c535_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4808
- 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:5908
- - 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\000042C3" 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:4380
  - - 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:1124
  - - 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:4184
  - - 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:4372
  - - 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:5176

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

000042C3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000042C3
Size 88KB
SHA256 ef1a04a71f27076674f54222333a747b9c72313f6396d74202dde8981b857ee8
MD5 40010338e9b83e5e2d6d967af7b6d2ca
SHA1 674269272d9369950f00345050c05a605b07b0c3
SHA512 848cfc63044397dd04076d245e21ce3705d473bd6b092921159b92e7e9dfa44d77edcb7c6494c4314cecc7fdef54575793f07e1dcdec2efb83da6ce091f3a214
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrst:zLy2Kerc64CiGImHc/28wzCBlycJWeeK
TLSH
T1AC933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 832d0551db44d7641c1deafb03d9bd761f970caba3f9d5452b4cfff89082767f
MD5 f37eb1b161242f79fd413a760a89c535
SHA1 248d6cca65e397934e0b7a243877b1793754d4a4
SHA512 de2746b615c2d2bbdfdb4c11ca76cc79b3a2c584c919c9a17ced5f64eab64fe66e416518a44738bad848354e409ec0604a3de18f9f66a05b36ff4fee52d9242b
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsk:zLy2Kerc64CiGImHc/28wzCBlycJWee/
TLSH
T10D933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4808-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4808-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4808-11-0x00000000009C0000-0x0000000000FC2000-memory.dmp

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memory/5176-19-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/5176-20-0x0000000000860000-0x0000000000E62000-memory.dmp

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memory/5176-28-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/5908-16-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/5908-15-0x00000000008B0000-0x0000000000EB2000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads