juko | 9c3cd3c77d90280a7e2bc0973549e139a2ce7d94fde6d3bedcf6b0119ceffdde

General

Target
2026-08-28_cade533faf0c556c45953c06536d7ee5_elex_wannacry.exe
Size 124KB
Sample260828-kmh33avycv
SHA256 9c3cd3c77d90280a7e2bc0973549e139a2ce7d94fde6d3bedcf6b0119ceffdde
MD5 cade533faf0c556c45953c06536d7ee5
SHA1 97569367f2dd8e7f81f88bc394d700b3a61e3549
SHA512 1418d7b11341bfd5cd575b3abdf221767de2ff764ca26555a385145eed2f3107a436413448b33cc2acd3536309ec40b003c6aa6fb0a8bcd9152b94300391311b
SSDEEP 768:6ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFE1CaW+99DmggwaY:eLsF2Kerc64sTiX2IV0DpKED9DmqaY
TLSH
T177C34B2B2A642051C1862174A8556B398D74BDB4013BE031B7817E9E18BBDE7CF7CBDE
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/5076-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000a00000001138e-5.dat	family_juko
behavioral2/memory/5076-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/3524-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x0007000000016cc0-13.dat	family_juko
behavioral2/memory/712-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/712-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3524	WINWORD.exe
712	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-1-5-21-1079202589-886135813-2527035092-1000\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
5900	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-28_cade533faf0c556c45953c06536d7ee5_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

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
3224	PING.EXE
3192	PING.EXE
4360	PING.EXE
5900	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3224	PING.EXE
3192	PING.EXE
4360	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5076 wrote to memory of 3524	5076	2026-08-28_cade533faf0c556c45953c06536d7ee5_elex_wannacry.exe	89
PID 3524 wrote to memory of 5900	3524	WINWORD.exe	90
PID 5900 wrote to memory of 3224	5900	cmd.exe	92
PID 5900 wrote to memory of 3192	5900	cmd.exe	93
PID 5900 wrote to memory of 4360	5900	cmd.exe	94
PID 5900 wrote to memory of 712	5900	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-28_cade533faf0c556c45953c06536d7ee5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-28_cade533faf0c556c45953c06536d7ee5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5076
- 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:3524
- - 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\00007450" 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:5900
  - - 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:3224
  - - 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:3192
  - - 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:4360
  - - 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:712

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

00007450

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007450
Size 124KB
SHA256 54ccff339fbf748a4af663dd8c7b56b0f7b2e2f3fb2f6c207689cdf5a07659fa
MD5 d739e54fd9554aef199666b5d98287b0
SHA1 e82f9fb39b30982dca57ab082a285d4828d7ee3c
SHA512 63604e3bec1d7320e76c7cda5c4ef69c3bf0405b895fb63f8bbac0edb4aa654006b22d55628555b313173b9da8d406663e1d856ab99f245c8fb971dafa7e882f
SSDEEP 768:6ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFE1CaW+99Dmggwap:eLsF2Kerc64sTiX2IV0DpKED9Dmqap
TLSH
T13BC34B2B2A642051C1862174A8556B398D74BDB4013BA031B7817E9E18BBDE7CF7CBDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 124KB
SHA256 9c3cd3c77d90280a7e2bc0973549e139a2ce7d94fde6d3bedcf6b0119ceffdde
MD5 cade533faf0c556c45953c06536d7ee5
SHA1 97569367f2dd8e7f81f88bc394d700b3a61e3549
SHA512 1418d7b11341bfd5cd575b3abdf221767de2ff764ca26555a385145eed2f3107a436413448b33cc2acd3536309ec40b003c6aa6fb0a8bcd9152b94300391311b
SSDEEP 768:6ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFE1CaW+99DmggwaY:eLsF2Kerc64sTiX2IV0DpKED9DmqaY
TLSH
T177C34B2B2A642051C1862174A8556B398D74BDB4013BE031B7817E9E18BBDE7CF7CBDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/712-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/712-16-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3524-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5076-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5076-9-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads