juko | 593117e86ace6a51d6d5211105f53fc1872a55e976a7a516e1d26267eabbe40c

General

Target
2026-08-31_f9b42e574a35607534f58d6981f5c635_elex_wannacry.exe
Size 30KB
Sample260831-prwl6ssarg
SHA256 593117e86ace6a51d6d5211105f53fc1872a55e976a7a516e1d26267eabbe40c
MD5 f9b42e574a35607534f58d6981f5c635
SHA1 576831b37f31a611a9d955a00e943417291d83dc
SHA512 74063ba4a257a3881f157713efc6f527e38f754c8259e182f910911e5fd85919956cbd3d72dc90933910e9876b18c93da894cd794703a01cf1a3f69a965d860f
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXt:tLsF2Kerc64sTiX2IV0Dzlot
TLSH
T1B3E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x000800000001b871-4.dat	family_juko
behavioral2/files/0x000f00000001c467-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4528	WINWORD.exe
800	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4500	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 6 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	2026-08-31_f9b42e574a35607534f58d6981f5c635_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
5780	PING.EXE
4384	PING.EXE
4884	PING.EXE
4500	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5780	PING.EXE
4384	PING.EXE
4884	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2808 wrote to memory of 4528	2808	2026-08-31_f9b42e574a35607534f58d6981f5c635_elex_wannacry.exe	89
PID 4528 wrote to memory of 4500	4528	WINWORD.exe	90
PID 4500 wrote to memory of 5780	4500	cmd.exe	92
PID 4500 wrote to memory of 4384	4500	cmd.exe	93
PID 4500 wrote to memory of 4884	4500	cmd.exe	94
PID 4500 wrote to memory of 800	4500	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_f9b42e574a35607534f58d6981f5c635_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_f9b42e574a35607534f58d6981f5c635_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2808
- 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:4528
- - 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\00007136" 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:4500
  - - 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:5780
  - - 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:4384
  - - 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:4884
  - - 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
      PID:800

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

00007136

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007136
Size 30KB
SHA256 66c06f4d1b113bc6566cb9415cdfbebf9f45a14a22cf1071690b584ac9cdace1
MD5 11f887caccea577ff3b87f7879bc4ee7
SHA1 5a70d9a3b9e3f11658df19e0f1260549b8e3821e
SHA512 155995c85fd3e762465e61888d2d87f2001153ea31133e1bf52ff0af3752ff60d631960a7865bf0e05ce74df02e50c973b1ea66e6c6e84f7222ae6a3516522f3
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXN:tLsF2Kerc64sTiX2IV0DzloN
TLSH
T1D7E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 593117e86ace6a51d6d5211105f53fc1872a55e976a7a516e1d26267eabbe40c
MD5 f9b42e574a35607534f58d6981f5c635
SHA1 576831b37f31a611a9d955a00e943417291d83dc
SHA512 74063ba4a257a3881f157713efc6f527e38f754c8259e182f910911e5fd85919956cbd3d72dc90933910e9876b18c93da894cd794703a01cf1a3f69a965d860f
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXt:tLsF2Kerc64sTiX2IV0Dzlot
TLSH
T1B3E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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