juko | 75600dc830232b8ef52da717e6cf07ba6739f8efe02b480c80eb67de6a2c6b6c

General

Target
2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe
Size 39KB
Sample260723-ydvmdstyey
SHA256 75600dc830232b8ef52da717e6cf07ba6739f8efe02b480c80eb67de6a2c6b6c
MD5 f5b07309dd3c188454ebb0078a238443
SHA1 a70f0789d561c6a3982158411e81f37b3fec27e1
SHA512 d0a2ed64446463e4e676034729fbab35e41dada7a01edca32db4b4d18cb1aef364bfcc4bdff23c5af7934f8aa61fdc2313805f245c52bba555e6df770c0fbb21
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBP:aLsF2Kerc64sTiX2IV0DVyIGFE
TLSH
T10B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4680-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000c000000019cb8-5.dat	family_juko
behavioral2/memory/4680-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4692-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0003000000000432-13.dat	family_juko
behavioral2/memory/3096-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3096-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4692	WINWORD.exe
3096	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-1-5-21-3797332335-34111092-3597280141-1000\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
4116	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	2026-07-23_f5b07309dd3c188454ebb0078a238443_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
4116	cmd.exe
256	PING.EXE
1744	PING.EXE
4780	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
256	PING.EXE
1744	PING.EXE
4780	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4680 wrote to memory of 4692	4680	2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe	88
PID 4692 wrote to memory of 4116	4692	WINWORD.exe	89
PID 4116 wrote to memory of 256	4116	cmd.exe	91
PID 4116 wrote to memory of 1744	4116	cmd.exe	92
PID 4116 wrote to memory of 4780	4116	cmd.exe	93
PID 4116 wrote to memory of 3096	4116	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4680
- 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:4692
- - 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\00005D7B" 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:4116
  - - 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:256
  - - 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:1744
  - - 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:4780
  - - 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:3096

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

00005D7B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005D7B
Size 39KB
SHA256 bc45e5ca3dd69c1b7b8a4711daf79ba3bd48e8a42b0b5740984270d9cb5b2e39
MD5 289e6a4c7d97313eb279b2ce63080eb2
SHA1 4094a3d96668647e2366994285ac8862774a9df2
SHA512 d994dba1614a410bbe3960465e0e74b42c0f02180392ffda6d7c196bc7cff45f17912f55ca5824472adfef68de3f86d0f3f3900563a008485a778dceaacfa7b2
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBu:aLsF2Kerc64sTiX2IV0DVyIGFR
TLSH
T1F1036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 75600dc830232b8ef52da717e6cf07ba6739f8efe02b480c80eb67de6a2c6b6c
MD5 f5b07309dd3c188454ebb0078a238443
SHA1 a70f0789d561c6a3982158411e81f37b3fec27e1
SHA512 d0a2ed64446463e4e676034729fbab35e41dada7a01edca32db4b4d18cb1aef364bfcc4bdff23c5af7934f8aa61fdc2313805f245c52bba555e6df770c0fbb21
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBP:aLsF2Kerc64sTiX2IV0DVyIGFE
TLSH
T10B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3096-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3096-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4680-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4680-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4692-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads