juko | 5069db75306596175c0bcce6a9c74d9eca6c7926d39af2dd37bf7501ff46654c

General

Target
2026-09-04_39d279ebc73aaf3700440b5b96a31f15_elex_wannacry.exe
Size 42KB
Sample260905-q7xpvawcnf
SHA256 5069db75306596175c0bcce6a9c74d9eca6c7926d39af2dd37bf7501ff46654c
MD5 39d279ebc73aaf3700440b5b96a31f15
SHA1 698398b077900012d97ba429c6f194a004ab4b50
SHA512 720ccd2f23a6ef3f7fb93c36bdb1594eb7c036af336e68e7ff4022d49bcaae5a86155f3f35e3b4471d1ea761045c8b81859cdb7a6c9d439d2b7ba27f3fe6ee91
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41t:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+C
TLSH
T1DD13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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/0x000b000000011390-4.dat	family_juko
behavioral2/files/0x001100000001c4c3-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2276	WINWORD.exe
1740	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
4104	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	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	2026-09-04_39d279ebc73aaf3700440b5b96a31f15_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

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
4104	cmd.exe
5956	PING.EXE
3896	PING.EXE
3172	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5956	PING.EXE
3896	PING.EXE
3172	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4200 wrote to memory of 2276	4200	2026-09-04_39d279ebc73aaf3700440b5b96a31f15_elex_wannacry.exe	89
PID 2276 wrote to memory of 4104	2276	WINWORD.exe	90
PID 4104 wrote to memory of 5956	4104	cmd.exe	92
PID 4104 wrote to memory of 3896	4104	cmd.exe	93
PID 4104 wrote to memory of 3172	4104	cmd.exe	94
PID 4104 wrote to memory of 1740	4104	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-04_39d279ebc73aaf3700440b5b96a31f15_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_39d279ebc73aaf3700440b5b96a31f15_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4200
- 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:2276
- - 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\00005BCF" 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:4104
  - - 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:5956
  - - 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:3896
  - - 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:3172
  - - 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:1740

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

00005BCF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005BCF
Size 42KB
SHA256 f5d8277bca8a869521245e8962f7a4a596e30452a4b6f07d5cbf65ae7257faa4
MD5 072d1138d8e22fedba2cc2c8bf85dc27
SHA1 589a80d8b5e9e6934155583ea40e875f2fb6b129
SHA512 80db4cd810902563e7ecb3ae4d42ed7878331c4f30f38541030cdce3000664dadd16a2afc9726e5cc9318f2c46471bc1f3143a7d0cdd8bd1edb1488bb2b13d88
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41W:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+h
TLSH
T13513171776A460D2CDB76074E51A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 5069db75306596175c0bcce6a9c74d9eca6c7926d39af2dd37bf7501ff46654c
MD5 39d279ebc73aaf3700440b5b96a31f15
SHA1 698398b077900012d97ba429c6f194a004ab4b50
SHA512 720ccd2f23a6ef3f7fb93c36bdb1594eb7c036af336e68e7ff4022d49bcaae5a86155f3f35e3b4471d1ea761045c8b81859cdb7a6c9d439d2b7ba27f3fe6ee91
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41t:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+C
TLSH
T1DD13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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