juko | 5aeadbf4c10e9ea141c5bf18aba3663fe9a300b0e6eb0835dae1d97675bcc8e1

General

Target
2026-08-24_83ffe45b558b44010ce211319e95e6ca_elex_wannacry.exe
Size 49KB
Sample260825-ktnbcsge23
SHA256 5aeadbf4c10e9ea141c5bf18aba3663fe9a300b0e6eb0835dae1d97675bcc8e1
MD5 83ffe45b558b44010ce211319e95e6ca
SHA1 887cb2d6aeb4a6d8ed99de6d0ea4888f80b655bb
SHA512 18863a5275118170f1d050ec49febd37b6026010800609db7b65b2e340e7655a88400cf54ce652a6422bb45af58d7bea230817d6da1f9ee3960e965489cfdfd4
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2R:4Ly2Kerc64CiGImVu8p4kojWh2R
TLSH
T19D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2324-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000900000001b83c-5.dat	family_juko
behavioral2/memory/2324-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1380-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c539-13.dat	family_juko
behavioral2/memory/4696-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4696-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1380	WINWORD.exe
4696	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
5024	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	cmd.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-24_83ffe45b558b44010ce211319e95e6ca_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
5024	cmd.exe
5948	PING.EXE
2352	PING.EXE
108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5948	PING.EXE
2352	PING.EXE
108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2324 wrote to memory of 1380	2324	2026-08-24_83ffe45b558b44010ce211319e95e6ca_elex_wannacry.exe	89
PID 1380 wrote to memory of 5024	1380	WINWORD.exe	90
PID 5024 wrote to memory of 5948	5024	cmd.exe	92
PID 5024 wrote to memory of 2352	5024	cmd.exe	93
PID 5024 wrote to memory of 108	5024	cmd.exe	94
PID 5024 wrote to memory of 4696	5024	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_83ffe45b558b44010ce211319e95e6ca_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_83ffe45b558b44010ce211319e95e6ca_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2324
- 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:1380
- - 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\00002D52" 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:5024
  - - 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:5948
  - - 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:2352
  - - 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:108
  - - 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:4696

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:1988

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

00002D52

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002D52
Size 49KB
SHA256 21e26a4a5ad2e786113802443ccd6b3c658224a13bf5826ad7272f4be7256c77
MD5 6498233ee8599b353c01da6470aaa954
SHA1 380fa5b8b2b4e57dd1d832b748583abb6ee7a245
SHA512 4541d17b048fed648ee4b7bc03273965f2ce3f6b885612cdbaf970ddfca249ccfcf9920071c42fa783fd9e2499b84a410dbf4c7a03ee340686e9b80ba2eee259
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:4Ly2Kerc64CiGImVu8p4kojWh2X
TLSH
T1E6334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5aeadbf4c10e9ea141c5bf18aba3663fe9a300b0e6eb0835dae1d97675bcc8e1
MD5 83ffe45b558b44010ce211319e95e6ca
SHA1 887cb2d6aeb4a6d8ed99de6d0ea4888f80b655bb
SHA512 18863a5275118170f1d050ec49febd37b6026010800609db7b65b2e340e7655a88400cf54ce652a6422bb45af58d7bea230817d6da1f9ee3960e965489cfdfd4
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2R:4Ly2Kerc64CiGImVu8p4kojWh2R
TLSH
T19D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1380-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2324-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2324-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4696-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4696-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads