juko | 32756d41601377b59afaa3f6075c2a9fbd42b212935a69912570d6d0ab66b8d0

General

Target
2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe
Size 222KB
Sample260515-1a1eksgs8x
SHA256 32756d41601377b59afaa3f6075c2a9fbd42b212935a69912570d6d0ab66b8d0
MD5 e72b752a76d6364e4a7f95560f2b6ad4
SHA1 81dd8b2e1c20cba76542973914048a92b1bc3bc3
SHA512 709521cf6af9c7d276419e7a5c05cbddfa269cdade5362639d1124c5fd707c6202059c34844bfd9805cc64bbda35f03c9d7a405df5e7b2434afa18f332c6862b
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokY:WkwcERoA28wzmJje7RsHcUTY
TLSH
T187245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/2592-0-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x002100000002b2a3-5.dat	family_juko
behavioral2/memory/3504-12-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/memory/2592-13-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/memory/3504-15-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3b4-16.dat	family_juko
behavioral2/memory/3540-18-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3504	WINWORD.exe
3540	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-1-5-21-125073035-2952146151-721812867-1000\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

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	2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_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

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
4800	cmd.exe
2604	PING.EXE
2964	PING.EXE
4464	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4464	PING.EXE
2604	PING.EXE
2964	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2592 wrote to memory of 3504	2592	2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe	80
PID 3504 wrote to memory of 4800	3504	WINWORD.exe	81
PID 4800 wrote to memory of 2604	4800	cmd.exe	83
PID 4800 wrote to memory of 2964	4800	cmd.exe	84
PID 4800 wrote to memory of 4464	4800	cmd.exe	85
PID 4800 wrote to memory of 3540	4800	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2592
- 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:3504
- - 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\000031C0" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4800
  - - 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:2604
  - - 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:2964
  - - 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:4464
  - - 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:3540

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

000031C0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000031C0
Size 222KB
SHA256 448504f840dfa905792c1b319126baa1367b543a9d285f4987b81014b15ec6b4
MD5 00e51882f680df35a11e75591e8eb451
SHA1 453998031bc3b40623f77471f6a6c5d0cc479482
SHA512 12c9dd1df4f2eea30381b0a47185f79b8c5967464bc6ed59909e0bc37d6dbff940a1a04776591334fa26b15f160fa7a6b60339f593fded5b306e02ac6b58bad4
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUok9:WkwcERoA28wzmJje7RsHcUT9
TLSH
T159245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 222KB
SHA256 32756d41601377b59afaa3f6075c2a9fbd42b212935a69912570d6d0ab66b8d0
MD5 e72b752a76d6364e4a7f95560f2b6ad4
SHA1 81dd8b2e1c20cba76542973914048a92b1bc3bc3
SHA512 709521cf6af9c7d276419e7a5c05cbddfa269cdade5362639d1124c5fd707c6202059c34844bfd9805cc64bbda35f03c9d7a405df5e7b2434afa18f332c6862b
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokY:WkwcERoA28wzmJje7RsHcUTY
TLSH
T187245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2592-0-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/2592-13-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3504-12-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3504-15-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/3540-18-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads