juko | 20364aec7a05b8ecf1a9bcf956e6e0992ba3a7bc073a710385e3e23f8aa1a3db

General

Target
2026-08-03_a74dce816c5af4bc1142936adb7b2726_elex_wannacry.exe
Size 30KB
Sample260804-meef1she47
SHA256 20364aec7a05b8ecf1a9bcf956e6e0992ba3a7bc073a710385e3e23f8aa1a3db
MD5 a74dce816c5af4bc1142936adb7b2726
SHA1 318f5c8938e7d5690197cf537ce5917c02f5b40a
SHA512 5679f62a11207279f72954ce7b1b81595bd160ace5ec9948208bb601f5f317c6e12951ac93ea9c749dbee0ff4bc009754a0f5d3eeebcaf0d18bbfbca5f521275
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrG:OLsF2Kerc64sTiX2IV0DkFMG
TLSH
T11FE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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/0x000800000001b853-4.dat	family_juko
behavioral2/files/0x000e00000001c50d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4500	WINWORD.exe
4136	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-1-5-21-4046655672-1449839301-2197395821-1000\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
2136	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	2026-08-03_a74dce816c5af4bc1142936adb7b2726_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
2136	cmd.exe
4112	PING.EXE
3340	PING.EXE
2840	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2840	PING.EXE
4112	PING.EXE
3340	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4960 wrote to memory of 4500	4960	2026-08-03_a74dce816c5af4bc1142936adb7b2726_elex_wannacry.exe	89
PID 4500 wrote to memory of 2136	4500	WINWORD.exe	90
PID 2136 wrote to memory of 4112	2136	cmd.exe	92
PID 2136 wrote to memory of 3340	2136	cmd.exe	93
PID 2136 wrote to memory of 2840	2136	cmd.exe	94
PID 2136 wrote to memory of 4136	2136	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_a74dce816c5af4bc1142936adb7b2726_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_a74dce816c5af4bc1142936adb7b2726_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4960
- 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:4500
- - 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\00001CBF" 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:2136
  - - 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:4112
  - - 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:3340
  - - 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:2840
  - - 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:4136

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

00001CBF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001CBF
Size 30KB
SHA256 24fcf647d296750a4846f9adc0b659f99f474767b7b38dc41220c3f966ea6997
MD5 8350360a2cdd2602de6685a483ad629f
SHA1 bd78bc976ceed8d46da15a44fef3e34b6dcdcb8e
SHA512 845797ed406e76df5bc51dfc64059c8ca07f5a0a878ca2903a2610167f9e630062d9eefdeb1b3851ee4dd5b8d9bad0e2f9b15846dd235bb69653a92505de9aa4
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHri:OLsF2Kerc64sTiX2IV0DkFMi
TLSH
T1F6E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 20364aec7a05b8ecf1a9bcf956e6e0992ba3a7bc073a710385e3e23f8aa1a3db
MD5 a74dce816c5af4bc1142936adb7b2726
SHA1 318f5c8938e7d5690197cf537ce5917c02f5b40a
SHA512 5679f62a11207279f72954ce7b1b81595bd160ace5ec9948208bb601f5f317c6e12951ac93ea9c749dbee0ff4bc009754a0f5d3eeebcaf0d18bbfbca5f521275
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrG:OLsF2Kerc64sTiX2IV0DkFMG
TLSH
T11FE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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