juko | 4d898bcec801ba5123d70f798d93d7f0bcde5ba044c1ae491a3c1e48cbb4bb0a

General

Target
2026-08-28_d6cc32f28391f282fa9a40b8151f79bb_elex_wannacry.exe
Size 49KB
Sample260828-jv136scc49
SHA256 4d898bcec801ba5123d70f798d93d7f0bcde5ba044c1ae491a3c1e48cbb4bb0a
MD5 d6cc32f28391f282fa9a40b8151f79bb
SHA1 a9877a9154ccbaabd3243a6dda697725b828098d
SHA512 984dee3a8fa61e887f593b50c842ccaac093b5a272597a530a37ebd5f409abb79e69a97ca1fd1f15543b556659a6f4c7a163feec6b296c1a07b29357890409f8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:VLy2Kerc64CiGImVu8p4kojWh29
TLSH
T19F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/1744-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b840-5.dat	family_juko
behavioral2/memory/1744-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3404-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c518-13.dat	family_juko
behavioral2/memory/708-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/708-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3404	WINWORD.exe
708	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-1-5-21-3989226554-2204910950-1522900112-1000\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
2900	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	2026-08-28_d6cc32f28391f282fa9a40b8151f79bb_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
1072	PING.EXE
5696	PING.EXE
2900	cmd.exe
2160	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2160	PING.EXE
1072	PING.EXE
5696	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 3404	1744	2026-08-28_d6cc32f28391f282fa9a40b8151f79bb_elex_wannacry.exe	89
PID 3404 wrote to memory of 2900	3404	WINWORD.exe	90
PID 2900 wrote to memory of 2160	2900	cmd.exe	92
PID 2900 wrote to memory of 1072	2900	cmd.exe	93
PID 2900 wrote to memory of 5696	2900	cmd.exe	94
PID 2900 wrote to memory of 708	2900	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-28_d6cc32f28391f282fa9a40b8151f79bb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-28_d6cc32f28391f282fa9a40b8151f79bb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1744
- 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:3404
- - 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\000033F2" 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:2900
  - - 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:2160
  - - 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:1072
  - - 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:5696
  - - 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:708

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

Replay Monitor

Loading Replay Monitor...

Downloads

000033F2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000033F2
Size 49KB
SHA256 edf44be14dad4f06d3276afc43cc373c12bd97df81b5466df7c0471a0f188ebc
MD5 76330a2d31f6fab9b9fb9da85877d9b6
SHA1 6e0d5b1a29b9a8b306b65dc86ee66fdb60686c71
SHA512 7b6ae8d4434a03ba17f39dfc6e441f0bd6c7e36fa7ade98623a40a5e503d874ef79d57e35b1a6dae77f5d3c9c74f6b0e123600dfba7961ffd4ef6dea0360c12a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:VLy2Kerc64CiGImVu8p4kojWh2P
TLSH
T11C334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 4d898bcec801ba5123d70f798d93d7f0bcde5ba044c1ae491a3c1e48cbb4bb0a
MD5 d6cc32f28391f282fa9a40b8151f79bb
SHA1 a9877a9154ccbaabd3243a6dda697725b828098d
SHA512 984dee3a8fa61e887f593b50c842ccaac093b5a272597a530a37ebd5f409abb79e69a97ca1fd1f15543b556659a6f4c7a163feec6b296c1a07b29357890409f8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h29:VLy2Kerc64CiGImVu8p4kojWh29
TLSH
T19F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/708-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/708-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1744-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1744-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3404-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads