juko | d28afbe4903884c42d8c115eb8d54c88ab408c4f59669132dd874de677a6ede0

General

Target
2026-07-20_511cb5040dfbd564308e9a4334b378cc_elex_wannacry.exe
Size 48KB
Sample260720-dn5j5ags7s
SHA256 d28afbe4903884c42d8c115eb8d54c88ab408c4f59669132dd874de677a6ede0
MD5 511cb5040dfbd564308e9a4334b378cc
SHA1 84e5d8432cf8c612188c45af0226bf444e8e935c
SHA512 efdc5b51127488f7dcdf624961639c7aeb35638f55b573b6f7a086e2924fb805c5b17b5c5a21952b9bf3f5fa9c558bb17e7903902c70772ba50c0a4567551b8d
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8a:bLy2Kerc64CiGImav42j0C
TLSH
T1FF234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/5576-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b87d-5.dat	family_juko
behavioral2/memory/5576-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2332-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4c8-13.dat	family_juko
behavioral2/memory/3816-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3816-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2332	WINWORD.exe
3816	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
4920	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	2026-07-20_511cb5040dfbd564308e9a4334b378cc_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
5384	PING.EXE
4212	PING.EXE
4396	PING.EXE
4920	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4396	PING.EXE
5384	PING.EXE
4212	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5576 wrote to memory of 2332	5576	2026-07-20_511cb5040dfbd564308e9a4334b378cc_elex_wannacry.exe	89
PID 2332 wrote to memory of 4920	2332	WINWORD.exe	90
PID 4920 wrote to memory of 5384	4920	cmd.exe	92
PID 4920 wrote to memory of 4212	4920	cmd.exe	93
PID 4920 wrote to memory of 4396	4920	cmd.exe	94
PID 4920 wrote to memory of 3816	4920	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_511cb5040dfbd564308e9a4334b378cc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_511cb5040dfbd564308e9a4334b378cc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5576
- 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:2332
- - 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\00004A6B" 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:4920
  - - 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:5384
  - - 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:4212
  - - 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:4396
  - - 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:3816

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

00004A6B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004A6B
Size 48KB
SHA256 073fbfa06be35f82a18d7cc4bacebcdfccd72f8de0b96b1f77eba3d362cac51c
MD5 72c7e903e289c23c2e5931e90f8445ba
SHA1 c756c26170b2e3f3f92bfec9fe76a572c337a6fa
SHA512 f57a3adc89c5e50c07cc01ecc818a728cec01f8ef0f82b835c68861a5ec724459800a97a0a655fb225617fefe6085c2e17b2f6b24da9ab07ba276292f28432b9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8D:bLy2Kerc64CiGImav42j0L
TLSH
T1CD234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 d28afbe4903884c42d8c115eb8d54c88ab408c4f59669132dd874de677a6ede0
MD5 511cb5040dfbd564308e9a4334b378cc
SHA1 84e5d8432cf8c612188c45af0226bf444e8e935c
SHA512 efdc5b51127488f7dcdf624961639c7aeb35638f55b573b6f7a086e2924fb805c5b17b5c5a21952b9bf3f5fa9c558bb17e7903902c70772ba50c0a4567551b8d
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8a:bLy2Kerc64CiGImav42j0C
TLSH
T1FF234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2332-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3816-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3816-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5576-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5576-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads