juko | 324c8eb7b19cf467f6f772e3dd01fc71f38902cc66c4a94815404c011ee41e7a

General

Target
2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.exe
Size 87KB
Sample260727-jwp3asycre
SHA256 324c8eb7b19cf467f6f772e3dd01fc71f38902cc66c4a94815404c011ee41e7a
MD5 b96c7e086be8d58672e33d95b29b469f
SHA1 fb18ae6369c02b651c0fecff337825d75c9c8323
SHA512 4f37a918537dcc7ba36526154ec47dba2a1f6b64d4ce56911518b0a16c22f63416f4a25dd4f6715984520b9fa1926d52c9d64b213c8ed13c21d0b6e80459f5ba
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpD:2Ly2Kerc64CiGIm1K851YO6EQkwpD
TLSH
T1C093A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4288-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000c000000016ce7-5.dat	family_juko
behavioral2/memory/4288-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3272-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c519-13.dat	family_juko
behavioral2/memory/2496-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2496-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3272	WINWORD.exe
2496	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-1-5-21-2115213192-531537726-3295841909-1000\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
3968	cmd.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.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
3968	cmd.exe
3396	PING.EXE
4004	PING.EXE
4836	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4836	PING.EXE
3396	PING.EXE
4004	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4288 wrote to memory of 3272	4288	2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.exe	88
PID 3272 wrote to memory of 3968	3272	WINWORD.exe	89
PID 3968 wrote to memory of 3396	3968	cmd.exe	91
PID 3968 wrote to memory of 4004	3968	cmd.exe	92
PID 3968 wrote to memory of 4836	3968	cmd.exe	93
PID 3968 wrote to memory of 2496	3968	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4288
- 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:3272
- - 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\000072F8" 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:3968
  - - 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:3396
  - - 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:4004
  - - 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:4836
  - - 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:2496

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000072F8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000072F8
Size 87KB
SHA256 9dfda84e93c7fb05f8bbc9bb7ce7455668318d0b53063b2887f41b24999d5efe
MD5 4475f7c0f733808ba8ae24b2c38f6eab
SHA1 e6d29638a37d339670d8d5e8b567740037290bc2
SHA512 4850f9222012c6c2fb0b1e5eb93360f077a72cee5feb7ec0dd0cd780d301ca38eb4c775549242eef627de428b90cff119666e2296d270d0bceb45d7cf8c9f955
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpt:2Ly2Kerc64CiGIm1K851YO6EQkwpt
TLSH
T19293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 324c8eb7b19cf467f6f772e3dd01fc71f38902cc66c4a94815404c011ee41e7a
MD5 b96c7e086be8d58672e33d95b29b469f
SHA1 fb18ae6369c02b651c0fecff337825d75c9c8323
SHA512 4f37a918537dcc7ba36526154ec47dba2a1f6b64d4ce56911518b0a16c22f63416f4a25dd4f6715984520b9fa1926d52c9d64b213c8ed13c21d0b6e80459f5ba
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpD:2Ly2Kerc64CiGIm1K851YO6EQkwpD
TLSH
T1C093A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2496-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2496-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3272-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4288-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4288-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads