juko | 1c20ca3b3997870d0393e8526d574ed5e5b9f1017c42e731d60fe4802ae633ae

General

Target
2026-07-20_6211fe2358c15aa22faed875d7a59a4a_elex_wannacry.exe
Size 39KB
Sample260720-145ldshw9s
SHA256 1c20ca3b3997870d0393e8526d574ed5e5b9f1017c42e731d60fe4802ae633ae
MD5 6211fe2358c15aa22faed875d7a59a4a
SHA1 4787d388f5d31a2493d05d7fc6bfa39e17a030d8
SHA512 cd645591b0043877625cd5ecff107557214b834e30450198664c007407650b00f3ab9214322f9c701cd6c9f5aa77413675b4aa2f97016c2a12ebf7b3f6c87f43
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGFr
TLSH
T1F2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2560-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e000000019cd9-5.dat	family_juko
behavioral2/memory/2560-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4848-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5ca-13.dat	family_juko
behavioral2/memory/2248-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2248-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4848	WINWORD.exe
2248	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-1-5-21-552508041-2681165170-3229858294-1000\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
1800	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	2026-07-20_6211fe2358c15aa22faed875d7a59a4a_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
2644	PING.EXE
4652	PING.EXE
1800	cmd.exe
5492	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5492	PING.EXE
2644	PING.EXE
4652	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2560 wrote to memory of 4848	2560	2026-07-20_6211fe2358c15aa22faed875d7a59a4a_elex_wannacry.exe	89
PID 4848 wrote to memory of 1800	4848	WINWORD.exe	90
PID 1800 wrote to memory of 5492	1800	cmd.exe	92
PID 1800 wrote to memory of 2644	1800	cmd.exe	93
PID 1800 wrote to memory of 4652	1800	cmd.exe	94
PID 1800 wrote to memory of 2248	1800	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_6211fe2358c15aa22faed875d7a59a4a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_6211fe2358c15aa22faed875d7a59a4a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2560
- 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:4848
- - 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\0000520A" 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:1800
  - - 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:5492
  - - 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:2644
  - - 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:4652
  - - 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:2248

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

0000520A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000520A
Size 39KB
SHA256 6023081a830bd286bece5a99cf08ecba88d1ac9357efeb27aa98705807e50253
MD5 91aa7c931f8e394cd91eebcfaad2b3cd
SHA1 6e32f499307a095a0ee8d2be246984c1963b57b9
SHA512 105c9951864d076c7404b0e0ca9b542ad8f9ca5a644e496da530f58c06abf511fafbe09fe26187519c63aad25391d419343bbe6de127a49e454b4997f3f71187
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T172036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 1c20ca3b3997870d0393e8526d574ed5e5b9f1017c42e731d60fe4802ae633ae
MD5 6211fe2358c15aa22faed875d7a59a4a
SHA1 4787d388f5d31a2493d05d7fc6bfa39e17a030d8
SHA512 cd645591b0043877625cd5ecff107557214b834e30450198664c007407650b00f3ab9214322f9c701cd6c9f5aa77413675b4aa2f97016c2a12ebf7b3f6c87f43
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGFr
TLSH
T1F2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2248-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2248-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2560-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2560-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4848-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads