juko | 0363b73ef863be17a9cf009093d39876a0dded5cd3deec947c70d707462c5a7c

General

Target
2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe
Size 39KB
Sample260730-pry3ashf89
SHA256 0363b73ef863be17a9cf009093d39876a0dded5cd3deec947c70d707462c5a7c
MD5 0021886d8adb6e3f31fa022f3a831128
SHA1 d510cfda38b21b71cb2b5e326cab1757849b22c0
SHA512 96657fdd83c62bd0a71c17a4dcbd3c213959feb457835a415712327de532ae76a994e285b1e72b0d0c583b3d0d6c6f889854632b0d3e83ad6ff5de063a2fb1a4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB6:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1D5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
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/3444-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b315-5.dat	family_juko
behavioral2/memory/3444-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3480-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4e6-13.dat	family_juko
behavioral2/memory/5432-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5432-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3480	WINWORD.exe
5432	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-1-5-21-1875162379-3804078649-638427191-1000\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
2072	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	2026-07-30_0021886d8adb6e3f31fa022f3a831128_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
2072	cmd.exe
3448	PING.EXE
5224	PING.EXE
3208	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3448	PING.EXE
5224	PING.EXE
3208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3444 wrote to memory of 3480	3444	2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe	89
PID 3480 wrote to memory of 2072	3480	WINWORD.exe	90
PID 2072 wrote to memory of 3448	2072	cmd.exe	92
PID 2072 wrote to memory of 5224	2072	cmd.exe	93
PID 2072 wrote to memory of 3208	2072	cmd.exe	94
PID 2072 wrote to memory of 5432	2072	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3444
- 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:3480
- - 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\0000649D" 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:2072
  - - 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:3448
  - - 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:5224
  - - 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:3208
  - - 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:5432

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

0000649D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000649D
Size 39KB
SHA256 a8d97f65223113adc2f4ee39820b58054f3b6a5c8d3cb5f1f170686652298f03
MD5 6a80664f7e26470e0b22d12d4747cb8c
SHA1 294b08a8342be53eca4804db38bd4e3212b8bd6e
SHA512 9ce24264ccc36f3c62ddf9194730414338f1388ebad5f358d1a671bc54c7c03061a9c1eb6e0cc54bc4fd05ede0cab1207e5a2d5ff7be4e093c9080e4f7ed29b3
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB/:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T101036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 0363b73ef863be17a9cf009093d39876a0dded5cd3deec947c70d707462c5a7c
MD5 0021886d8adb6e3f31fa022f3a831128
SHA1 d510cfda38b21b71cb2b5e326cab1757849b22c0
SHA512 96657fdd83c62bd0a71c17a4dcbd3c213959feb457835a415712327de532ae76a994e285b1e72b0d0c583b3d0d6c6f889854632b0d3e83ad6ff5de063a2fb1a4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB6:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1D5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3444-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3444-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3480-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5432-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5432-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads