juko | e700dfb1da02c76f16e91b351ee44936d9fab9a5254a09c4cb96c16f16460f21

General

Target
2026-08-05_6765deafc0647494045b856f491410d5_elex_wannacry.exe
Size 39KB
Sample260805-l385vsvdlf
SHA256 e700dfb1da02c76f16e91b351ee44936d9fab9a5254a09c4cb96c16f16460f21
MD5 6765deafc0647494045b856f491410d5
SHA1 6149ae9f44cb634281bf3b4b94ca5d19f9d268bd
SHA512 9b0771be0232bb313c0c7f38609cabb89e90248979a83b400639c8c027e75bfacc8b82d9f5f3cfa0ea116062f7727117a38232517e8ea7b3c20da951250d6095
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBg:aLsF2Kerc64sTiX2IV0DVyIGFD
TLSH
T1F7036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4384-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001b847-5.dat	family_juko
behavioral2/memory/4384-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/720-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c584-13.dat	family_juko
behavioral2/memory/4664-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4664-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
720	WINWORD.exe
4664	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
3212	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	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	2026-08-05_6765deafc0647494045b856f491410d5_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

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
3212	cmd.exe
1280	PING.EXE
2576	PING.EXE
4596	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1280	PING.EXE
2576	PING.EXE
4596	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4384 wrote to memory of 720	4384	2026-08-05_6765deafc0647494045b856f491410d5_elex_wannacry.exe	89
PID 720 wrote to memory of 3212	720	WINWORD.exe	90
PID 3212 wrote to memory of 1280	3212	cmd.exe	92
PID 3212 wrote to memory of 2576	3212	cmd.exe	93
PID 3212 wrote to memory of 4596	3212	cmd.exe	94
PID 3212 wrote to memory of 4664	3212	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_6765deafc0647494045b856f491410d5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_6765deafc0647494045b856f491410d5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4384
- 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:720
- - 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\00007583" 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:3212
  - - 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:1280
  - - 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:2576
  - - 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:4596
  - - 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:4664

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

00007583

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007583
Size 39KB
SHA256 36a20401dae4a0083a80eb2b2d2f25abf845e0130a8f86af041eba8c8ca63ec4
MD5 afc74e1146f08a16b62f47c0270a5372
SHA1 bb6d62503ad7a63e32df9ba18853683f3273b652
SHA512 1deb62b9afbc8b2e2d1757811ce363690173df63624b2e19b8f64d5d1319ce17b8b97ef1aee82f0e9c8af8b69962079b81d046126fca5fe31c7d242147454b79
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBz:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T119036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 e700dfb1da02c76f16e91b351ee44936d9fab9a5254a09c4cb96c16f16460f21
MD5 6765deafc0647494045b856f491410d5
SHA1 6149ae9f44cb634281bf3b4b94ca5d19f9d268bd
SHA512 9b0771be0232bb313c0c7f38609cabb89e90248979a83b400639c8c027e75bfacc8b82d9f5f3cfa0ea116062f7727117a38232517e8ea7b3c20da951250d6095
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBg:aLsF2Kerc64sTiX2IV0DVyIGFD
TLSH
T1F7036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/720-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4384-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4384-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4664-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4664-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads