juko | a4a2bc450f3e38ca101672b5bac45566064bc71ce6a5973bf9b5c494e5242c45

General

Target
2026-08-10_3102b07da8ec6f616ddeb3ab51f5deca_elex_wannacry.exe
Size 39KB
Sample260810-phw7caybmg
SHA256 a4a2bc450f3e38ca101672b5bac45566064bc71ce6a5973bf9b5c494e5242c45
MD5 3102b07da8ec6f616ddeb3ab51f5deca
SHA1 31b7ce29cf836ab882e17d945a42dcdf4498fe8b
SHA512 da58c61714562d866cc0612106d53d6c973fdb9d3ac61880a33287f7438bc69693d0fce10cc9f566ef21471df5b5329107ef3add6ec208e97b7f136c0171dbbe
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGF/
TLSH
T16F036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3500-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0009000000019cc1-5.dat	family_juko
behavioral2/memory/3500-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5740-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c516-13.dat	family_juko
behavioral2/memory/2756-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2756-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5740	WINWORD.exe
2756	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
1320	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	2026-08-10_3102b07da8ec6f616ddeb3ab51f5deca_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
2496	PING.EXE
1320	cmd.exe
5164	PING.EXE
5960	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5164	PING.EXE
5960	PING.EXE
2496	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3500 wrote to memory of 5740	3500	2026-08-10_3102b07da8ec6f616ddeb3ab51f5deca_elex_wannacry.exe	89
PID 5740 wrote to memory of 1320	5740	WINWORD.exe	90
PID 1320 wrote to memory of 5164	1320	cmd.exe	92
PID 1320 wrote to memory of 5960	1320	cmd.exe	93
PID 1320 wrote to memory of 2496	1320	cmd.exe	94
PID 1320 wrote to memory of 2756	1320	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_3102b07da8ec6f616ddeb3ab51f5deca_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_3102b07da8ec6f616ddeb3ab51f5deca_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3500
- 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:5740
- - 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\00000FDC" 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:1320
  - - 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:5164
  - - 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:5960
  - - 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:2496
  - - 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:2756

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

00000FDC

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000FDC
Size 39KB
SHA256 a937d68c787abb6094cd2199ed8963141cd0be9bda57187e2691dc301cb4bc38
MD5 87f5fe9a56be7c818b118f4f1b11a139
SHA1 0f1a4bc65a4fd8d447686e61e6a90b56b896e47d
SHA512 40d48986a4c3109996edd5b6507182a5668e206e20a739b26d70459fc6d5a2788854b5333df4683795c045b1f89a01e56c5d1480867f142a6bd7df3a2c0336c8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBD:aLsF2Kerc64sTiX2IV0DVyIGFs
TLSH
T1FC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 a4a2bc450f3e38ca101672b5bac45566064bc71ce6a5973bf9b5c494e5242c45
MD5 3102b07da8ec6f616ddeb3ab51f5deca
SHA1 31b7ce29cf836ab882e17d945a42dcdf4498fe8b
SHA512 da58c61714562d866cc0612106d53d6c973fdb9d3ac61880a33287f7438bc69693d0fce10cc9f566ef21471df5b5329107ef3add6ec208e97b7f136c0171dbbe
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGF/
TLSH
T16F036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2756-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2756-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3500-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3500-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5740-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads