juko | 1e521e2e736f1b02ee89e26ccdc8e9e7f75b10a7ab0b042673633120f0c170e7

General

Target
2026-08-01_f194ddc057b4d30d52307d7fda7c4fec_elex_wannacry.exe
Size 30KB
Sample260801-fbxpvsdg84
SHA256 1e521e2e736f1b02ee89e26ccdc8e9e7f75b10a7ab0b042673633120f0c170e7
MD5 f194ddc057b4d30d52307d7fda7c4fec
SHA1 06c631bd44824fa3111a9e59a633dcade67b4db2
SHA512 0e364e89306fd0adef35f511619770d6f367da8d10a9014089a49197651919b4ee1195eb38408e41a04c78787def223bf3b50848e06e2b4bad83ca23c4e0e7d5
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXs:tLsF2Kerc64sTiX2IV0Dzlos
TLSH
T13CE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x00160000000118ee-4.dat	family_juko
behavioral2/files/0x000d00000001c56a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
7096	WINWORD.exe
6312	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-1-5-21-1014449518-1831897916-4205727055-1000\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
916	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	2026-08-01_f194ddc057b4d30d52307d7fda7c4fec_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
916	cmd.exe
6224	PING.EXE
3816	PING.EXE
6256	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6224	PING.EXE
3816	PING.EXE
6256	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5452 wrote to memory of 7096	5452	2026-08-01_f194ddc057b4d30d52307d7fda7c4fec_elex_wannacry.exe	90
PID 7096 wrote to memory of 916	7096	WINWORD.exe	91
PID 916 wrote to memory of 6224	916	cmd.exe	93
PID 916 wrote to memory of 3816	916	cmd.exe	94
PID 916 wrote to memory of 6256	916	cmd.exe	95
PID 916 wrote to memory of 6312	916	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-01_f194ddc057b4d30d52307d7fda7c4fec_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_f194ddc057b4d30d52307d7fda7c4fec_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5452
- 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:7096
- - 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\000035C6" 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:916
  - - 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:6224
  - - 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:3816
  - - 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:6256
  - - 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:6312

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

000035C6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000035C6
Size 30KB
SHA256 34b13e99a1604000193f4b7d8e44f52e33b3bec41dc2ce68fc9015d417e046a7
MD5 4c2c5d8da49517213c38702a7c4d34e1
SHA1 665fe0999384faa21846fac9930cd904ccae7962
SHA512 05882cd271eb40674f61d92272e8eaba094a9493d7f16048da3e273c942dd30ea823aa2bd51876cd905bb1af2988ce491a2e66d5271c46da6145ee0d941f4633
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXu:tLsF2Kerc64sTiX2IV0Dzlou
TLSH
T1C5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 1e521e2e736f1b02ee89e26ccdc8e9e7f75b10a7ab0b042673633120f0c170e7
MD5 f194ddc057b4d30d52307d7fda7c4fec
SHA1 06c631bd44824fa3111a9e59a633dcade67b4db2
SHA512 0e364e89306fd0adef35f511619770d6f367da8d10a9014089a49197651919b4ee1195eb38408e41a04c78787def223bf3b50848e06e2b4bad83ca23c4e0e7d5
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXs:tLsF2Kerc64sTiX2IV0Dzlos
TLSH
T13CE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads