juko | d51c050040271e6d4b26b20781a9a4132c09b16c9c0e3c1b46c6c4450c16484b

General

Target
2026-05-27_304a0108b64cf1389df9feab6b725387_elex_wannacry.exe
Size 49KB
Sample260527-e3be9se17m
SHA256 d51c050040271e6d4b26b20781a9a4132c09b16c9c0e3c1b46c6c4450c16484b
MD5 304a0108b64cf1389df9feab6b725387
SHA1 fbdbc2773b1e6446bc84e71c99fc0963ade1fdcd
SHA512 44d245a4ad04db448d5a6666f3a375e11574e3ba9b0f2fe3e2a7b6f3176a1bc476d21927b0a1d5f1f7ebfd8c53f1f71721f8481d2a1df5466b0a1ba5dd26b26f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2Q:VLy2Kerc64CiGImVu8p4kojWh2Q
TLSH
T12D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/4900-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d000000026fd3-5.dat	family_juko
behavioral2/memory/4900-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3100-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b6b4-15.dat	family_juko
behavioral2/memory/3496-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3496-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3100	WINWORD.exe
3496	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-1-5-21-226940941-599731907-2645636698-1000\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

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	2026-05-27_304a0108b64cf1389df9feab6b725387_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
3504	PING.EXE
2404	PING.EXE
4240	PING.EXE
4860	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2404	PING.EXE
4240	PING.EXE
3504	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 3100	4900	2026-05-27_304a0108b64cf1389df9feab6b725387_elex_wannacry.exe	80
PID 3100 wrote to memory of 4860	3100	WINWORD.exe	81
PID 4860 wrote to memory of 3504	4860	cmd.exe	83
PID 4860 wrote to memory of 2404	4860	cmd.exe	84
PID 4860 wrote to memory of 4240	4860	cmd.exe	85
PID 4860 wrote to memory of 3496	4860	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-27_304a0108b64cf1389df9feab6b725387_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_304a0108b64cf1389df9feab6b725387_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4900
- 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:3100
- - 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\00000DF4" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4860
  - - 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:3504
  - - 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:2404
  - - 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:4240
  - - 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:3496

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00000DF4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000DF4
Size 49KB
SHA256 401cd1ae9e8cfc067747b4850cde243f1ae9c6e476e98eb077f1e2ceb45b27eb
MD5 4e7d569589127c563f58e096a7733826
SHA1 58ac3f95fcd952ff25448b3731be7fe9bd0892a7
SHA512 8a53e549b20ff2d3b9f8624c5cadbb2c09eed26855276f922fedbd3101cf18d2c52608bb9bcefba85df0c461d131913432789a8911ee9cc7c325522a5d8f5a48
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T189334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 d51c050040271e6d4b26b20781a9a4132c09b16c9c0e3c1b46c6c4450c16484b
MD5 304a0108b64cf1389df9feab6b725387
SHA1 fbdbc2773b1e6446bc84e71c99fc0963ade1fdcd
SHA512 44d245a4ad04db448d5a6666f3a375e11574e3ba9b0f2fe3e2a7b6f3176a1bc476d21927b0a1d5f1f7ebfd8c53f1f71721f8481d2a1df5466b0a1ba5dd26b26f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2Q:VLy2Kerc64CiGImVu8p4kojWh2Q
TLSH
T12D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3100-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3496-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3496-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4900-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4900-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads