juko | e9467458b5e75e147eafcd3b9cc3396f63ddc4d47d8aa83b85fe8e32b966ce76

General

Target
2026-08-22_9fe23d4ec986c352e9bde5e3f632c17d_elex_wannacry.exe
Size 39KB
Sample260823-eabkkahc34
SHA256 e9467458b5e75e147eafcd3b9cc3396f63ddc4d47d8aa83b85fe8e32b966ce76
MD5 9fe23d4ec986c352e9bde5e3f632c17d
SHA1 42c1f21f194b20f1eb8fcd956cf1d5a08a4604ca
SHA512 565f3297aa38a7dbcd4ac8c635c04585994dfc9d3b31fb6b27fa50574f95e0583643e5eaf3159d85c78c99fecc7391ccc2a0ed1f20e0a6dc80827055842d60ff
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB7:aLsF2Kerc64sTiX2IV0DVyIGFY
TLSH
T1A8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4636-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001b847-5.dat	family_juko
behavioral2/memory/4636-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/720-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c584-13.dat	family_juko
behavioral2/memory/1292-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1292-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
720	WINWORD.exe
1292	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
3952	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	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	2026-08-22_9fe23d4ec986c352e9bde5e3f632c17d_elex_wannacry.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
3952	cmd.exe
2712	PING.EXE
2576	PING.EXE
5980	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2712	PING.EXE
2576	PING.EXE
5980	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4636 wrote to memory of 720	4636	2026-08-22_9fe23d4ec986c352e9bde5e3f632c17d_elex_wannacry.exe	89
PID 720 wrote to memory of 3952	720	WINWORD.exe	90
PID 3952 wrote to memory of 2712	3952	cmd.exe	92
PID 3952 wrote to memory of 2576	3952	cmd.exe	93
PID 3952 wrote to memory of 5980	3952	cmd.exe	94
PID 3952 wrote to memory of 1292	3952	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-22_9fe23d4ec986c352e9bde5e3f632c17d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_9fe23d4ec986c352e9bde5e3f632c17d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4636
- 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\00006F57" 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:3952
  - - 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:2712
  - - 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:5980
  - - 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:1292

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

Replay Monitor

Loading Replay Monitor...

Downloads

00006F57

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006F57
Size 39KB
SHA256 4bef5a21a193ba8e01d39e5105c97ba321be0f6ca16e3b5f843799f9b1d3bfc7
MD5 92ef1dec015440bfc8356c2771d633e1
SHA1 ce416a81ddd0cb0ba117b07866626ce982ad2f7a
SHA512 8003bd94c9173d5e1de0fc3fa3e3cdbc6b316f04126fdd36bd82fd42446b0321aeb22a60b5862b5bc194840735f877331680b449e64bf4bfe49227c4df7c450a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB1:aLsF2Kerc64sTiX2IV0DVyIGFK
TLSH
T1CC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 e9467458b5e75e147eafcd3b9cc3396f63ddc4d47d8aa83b85fe8e32b966ce76
MD5 9fe23d4ec986c352e9bde5e3f632c17d
SHA1 42c1f21f194b20f1eb8fcd956cf1d5a08a4604ca
SHA512 565f3297aa38a7dbcd4ac8c635c04585994dfc9d3b31fb6b27fa50574f95e0583643e5eaf3159d85c78c99fecc7391ccc2a0ed1f20e0a6dc80827055842d60ff
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB7:aLsF2Kerc64sTiX2IV0DVyIGFY
TLSH
T1A8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

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

Download

memory/1292-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1292-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4636-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4636-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads