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
behavioral1/memory/1760-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00080000000231e6-5.dat	family_juko
behavioral1/memory/1760-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4960-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0009000000024479-15.dat	family_juko
behavioral1/memory/4932-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4932-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4960	WINWORD.exe
4932	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-1-5-21-540052884-2969440504-464782435-1000\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
972	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	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
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

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
3272	PING.EXE
972	cmd.exe
3324	PING.EXE
4820	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3324	PING.EXE
4820	PING.EXE
3272	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1760 wrote to memory of 4960	1760	2026-07-27_b96c7e086be8d58672e33d95b29b469f_elex_wannacry.exe	83
PID 4960 wrote to memory of 972	4960	WINWORD.exe	84
PID 972 wrote to memory of 3324	972	cmd.exe	86
PID 972 wrote to memory of 4820	972	cmd.exe	87
PID 972 wrote to memory of 3272	972	cmd.exe	90
PID 972 wrote to memory of 4932	972	cmd.exe	93

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1760
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4960
- - 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\00000892" 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:972
  - - 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:3324
  - - 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:4820
  - - 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:3272
  - - 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:4932

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00000892

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000892
Size 87KB
SHA256 d7adf757a8f3919c46e8cf3dc9a92aa7d726b86f75e29cef4be5a065782ad5b2
MD5 7ff97f8445bcb7ba3fa6c8aeb9fe196d
SHA1 20cae8804aaa7019d0e619b795d8214eabc64b2e
SHA512 a831dd22c3a87064e0ad4748d34f6e8adf64a4956f231c6f4cca07839e1567363b63e8116cf608594825f2139df3e1f62d0663aeebfe51df4c1821f51a8d2441
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpf:2Ly2Kerc64CiGIm1K851YO6EQkwpf
TLSH
T1D393A1763A259190C48BD138E8155AA0B932DCF52FF75303E7417AAC59B1E13CFAE8C6
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/1760-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1760-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4932-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4932-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4960-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads