juko | 7db6a62e519598035d6fcbe23913994aba31fdddfb0df281302510e9f70dd3cd

General

Target
2026-08-14_f6b489fe1c87f47d25ce88d646228498_elex_wannacry.exe
Size 39KB
Sample260814-2nf4jatana
SHA256 7db6a62e519598035d6fcbe23913994aba31fdddfb0df281302510e9f70dd3cd
MD5 f6b489fe1c87f47d25ce88d646228498
SHA1 2372547708dc4ce8838bc68f49e657558f6ee5c1
SHA512 b0634a2079809ed5bbb9dbebc6e1826020aa2bddb3c8a0b4f6187676a3496a67551a5bc723369b06e6abc155f681a33be181c5cc05b604199be998ad40b1b370
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBL:aLsF2Kerc64sTiX2IV0DVyIGFA
TLSH
T109035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2300-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/2300-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3812-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c520-13.dat	family_juko
behavioral2/memory/3088-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3088-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3812	WINWORD.exe
3088	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
1132	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	2026-08-14_f6b489fe1c87f47d25ce88d646228498_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
1132	cmd.exe
5036	PING.EXE
1852	PING.EXE
2512	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5036	PING.EXE
1852	PING.EXE
2512	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2300 wrote to memory of 3812	2300	2026-08-14_f6b489fe1c87f47d25ce88d646228498_elex_wannacry.exe	90
PID 3812 wrote to memory of 1132	3812	WINWORD.exe	91
PID 1132 wrote to memory of 5036	1132	cmd.exe	93
PID 1132 wrote to memory of 1852	1132	cmd.exe	94
PID 1132 wrote to memory of 2512	1132	cmd.exe	95
PID 1132 wrote to memory of 3088	1132	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-14_f6b489fe1c87f47d25ce88d646228498_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-14_f6b489fe1c87f47d25ce88d646228498_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2300
- 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:3812
- - 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\000026C0" 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:1132
  - - 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:5036
  - - 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:1852
  - - 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:2512
  - - 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:3088

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

000026C0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000026C0
Size 39KB
SHA256 4c0d6623e88e0acbcb00e41b8379deaaf30ff4cef9d1b5c614373c91c6ee032d
MD5 d6d1eb51bcddf3d268cd2e61ce249d1c
SHA1 1e47eb78006cc8bbca3f8dc224db66e75eb81dac
SHA512 b9b0b1ca9513ddbd3283369082eaa28d9a5b33e6957a3352bb68b1e204f2a056766a07bb93c093e17e47206b83a857ac976b776b9470c09eb5cfe97242e79206
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBS:aLsF2Kerc64sTiX2IV0DVyIGFt
TLSH
T183036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 7db6a62e519598035d6fcbe23913994aba31fdddfb0df281302510e9f70dd3cd
MD5 f6b489fe1c87f47d25ce88d646228498
SHA1 2372547708dc4ce8838bc68f49e657558f6ee5c1
SHA512 b0634a2079809ed5bbb9dbebc6e1826020aa2bddb3c8a0b4f6187676a3496a67551a5bc723369b06e6abc155f681a33be181c5cc05b604199be998ad40b1b370
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBL:aLsF2Kerc64sTiX2IV0DVyIGFA
TLSH
T109035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2300-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2300-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3088-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3088-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3812-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads