juko | 54f86c1b2e4f1a2228823d34cad5470bd0ad8f5233f4138685d8f5fc8ce37460

General

Target
2026-09-20_60935d99e7cbafb1e3f360a94445e46f_elex_wannacry.exe
Size 94KB
Sample260921-kn67aaef72
SHA256 54f86c1b2e4f1a2228823d34cad5470bd0ad8f5233f4138685d8f5fc8ce37460
MD5 60935d99e7cbafb1e3f360a94445e46f
SHA1 a4ebfb74099b74a6058881d10b1074ccc70ac736
SHA512 b9aad4a83ed408ae4358fda1220291fd0e807a037f1fb8a12c8e9b1d279470768218cfc37c02ac78ccb0eaaddc2feea6bed810e8286145210b6f027881b5d680
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NV:RLy2Kerc64CiGImFYgUBWTb4/NV
TLSH
T18A937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/5092-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x00170000000115b9-5.dat	family_juko
behavioral2/memory/5092-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4300-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001100000001b89d-13.dat	family_juko
behavioral2/memory/4656-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4656-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4300	WINWORD.exe
4656	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-1-5-21-2714045687-1127350534-2056456672-1000\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
4444	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-20_60935d99e7cbafb1e3f360a94445e46f_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

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
4444	cmd.exe
2544	PING.EXE
468	PING.EXE
4520	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2544	PING.EXE
468	PING.EXE
4520	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5092 wrote to memory of 4300	5092	2026-09-20_60935d99e7cbafb1e3f360a94445e46f_elex_wannacry.exe	90
PID 4300 wrote to memory of 4444	4300	WINWORD.exe	91
PID 4444 wrote to memory of 2544	4444	cmd.exe	93
PID 4444 wrote to memory of 468	4444	cmd.exe	94
PID 4444 wrote to memory of 4520	4444	cmd.exe	95
PID 4444 wrote to memory of 4656	4444	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-09-20_60935d99e7cbafb1e3f360a94445e46f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-20_60935d99e7cbafb1e3f360a94445e46f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5092
- 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:4300
- - 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\00006908" 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:4444
  - - 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:2544
  - - 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:468
  - - 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:4520
  - - 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:4656

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

00006908

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006908
Size 94KB
SHA256 a5b8fe97e709fd211e3062778d7216bca41c90c3ca798b94f33737505c802f73
MD5 2e69bdaf5e5dfd833928a339d1c242ce
SHA1 036dbe94c1b06911f726f874a2613ddd122e901c
SHA512 3a8c8768423e4238072528bcd42aa618aa233f0ee4c3a462f28008f6cca1c811b3c0970c18ffbbe35ffac297467de000a3cd43e344ddea4e0dfdab1d9815e291
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nl:RLy2Kerc64CiGImFYgUBWTb4/Nl
TLSH
T12E937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 54f86c1b2e4f1a2228823d34cad5470bd0ad8f5233f4138685d8f5fc8ce37460
MD5 60935d99e7cbafb1e3f360a94445e46f
SHA1 a4ebfb74099b74a6058881d10b1074ccc70ac736
SHA512 b9aad4a83ed408ae4358fda1220291fd0e807a037f1fb8a12c8e9b1d279470768218cfc37c02ac78ccb0eaaddc2feea6bed810e8286145210b6f027881b5d680
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NV:RLy2Kerc64CiGImFYgUBWTb4/NV
TLSH
T18A937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4300-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4656-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4656-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5092-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5092-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads