juko | 0430e6e6b1892d1ce61282e5f50c5579fb1e2e153a4724ea6498b0734d25b669

General

Target
2026-08-02_5022dc21189513b4ea7f2170880a34e3_elex_wannacry.exe
Size 49KB
Sample260802-nt5geshr51
SHA256 0430e6e6b1892d1ce61282e5f50c5579fb1e2e153a4724ea6498b0734d25b669
MD5 5022dc21189513b4ea7f2170880a34e3
SHA1 02a24e20ec3afd74a832ca87bb9961b25169b0e7
SHA512 9e40757e27756f6ca71195f4eb64d626fbadb75acf9010b77e42f237886f3b263bd4f74ab87c442fde0f706126bdef42756f473e3c62f2ff270c8f1a53da3bfe
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2F:VLy2Kerc64CiGImVucp4kojWh2F
TLSH
T13F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/3436-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b89b-5.dat	family_juko
behavioral2/memory/3436-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4860-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c495-13.dat	family_juko
behavioral2/memory/2556-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2556-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4860	WINWORD.exe
2556	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
3472	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	2026-08-02_5022dc21189513b4ea7f2170880a34e3_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
3064	PING.EXE
5748	PING.EXE
3472	cmd.exe
3684	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3684	PING.EXE
3064	PING.EXE
5748	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3436 wrote to memory of 4860	3436	2026-08-02_5022dc21189513b4ea7f2170880a34e3_elex_wannacry.exe	89
PID 4860 wrote to memory of 3472	4860	WINWORD.exe	90
PID 3472 wrote to memory of 3684	3472	cmd.exe	92
PID 3472 wrote to memory of 3064	3472	cmd.exe	93
PID 3472 wrote to memory of 5748	3472	cmd.exe	94
PID 3472 wrote to memory of 2556	3472	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_5022dc21189513b4ea7f2170880a34e3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_5022dc21189513b4ea7f2170880a34e3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3436
- 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:4860
- - 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\00000C5C" 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:3472
  - - 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:3684
  - - 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:3064
  - - 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:5748
  - - 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:2556

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

00000C5C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000C5C
Size 49KB
SHA256 75e114c8223bbe3ef35aff3337efc6043d4655a8295cca44828b357da256b2c9
MD5 ef629955cca92648ce2f5fb2c0145e4f
SHA1 fb2883b408a8b01c2908ceeb052781adee613978
SHA512 2c3675c4846da26bfa3a70dc202acd2a4b50c9dbf56deebd622d396bd361985ef0c6e2ec90bcecc8b5ad9a6adfe51d91cada699a251207fd804c925af3d94b81
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2j:VLy2Kerc64CiGImVucp4kojWh2j
TLSH
T1CD334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 0430e6e6b1892d1ce61282e5f50c5579fb1e2e153a4724ea6498b0734d25b669
MD5 5022dc21189513b4ea7f2170880a34e3
SHA1 02a24e20ec3afd74a832ca87bb9961b25169b0e7
SHA512 9e40757e27756f6ca71195f4eb64d626fbadb75acf9010b77e42f237886f3b263bd4f74ab87c442fde0f706126bdef42756f473e3c62f2ff270c8f1a53da3bfe
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2F:VLy2Kerc64CiGImVucp4kojWh2F
TLSH
T13F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2556-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2556-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3436-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3436-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4860-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads