juko | b31b9124a3776ab20bd91e6bed38345ad82fa8b94e3665317131174561d9e335

General

Target
2026-08-31_94878a62f5165bccd3cacffa05deb711_elex_wannacry.exe
Size 48KB
Sample260831-vj6eashf46
SHA256 b31b9124a3776ab20bd91e6bed38345ad82fa8b94e3665317131174561d9e335
MD5 94878a62f5165bccd3cacffa05deb711
SHA1 64239928cdae2d24c7bf154f7c08489b8cfc94dc
SHA512 6b92ea6eeb2b2d024ff4ece9f50c543f5865b36d05c6df27f2d56708672f5a59e948e039152d0149aaa91a081e7a5c6b53587590d868e178e6f252aa0a3179e0
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8+:bLy2Kerc64CiGImav42j02
TLSH
T110234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/4068-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e000000016cd6-5.dat	family_juko
behavioral2/memory/4068-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3432-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ee-13.dat	family_juko
behavioral2/memory/356-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/356-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3432	WINWORD.exe
356	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-1-5-21-3989226554-2204910950-1522900112-1000\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
5916	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	2026-08-31_94878a62f5165bccd3cacffa05deb711_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
3864	PING.EXE
3208	PING.EXE
5916	cmd.exe
248	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
248	PING.EXE
3864	PING.EXE
3208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4068 wrote to memory of 3432	4068	2026-08-31_94878a62f5165bccd3cacffa05deb711_elex_wannacry.exe	89
PID 3432 wrote to memory of 5916	3432	WINWORD.exe	90
PID 5916 wrote to memory of 248	5916	cmd.exe	92
PID 5916 wrote to memory of 3864	5916	cmd.exe	93
PID 5916 wrote to memory of 3208	5916	cmd.exe	94
PID 5916 wrote to memory of 356	5916	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_94878a62f5165bccd3cacffa05deb711_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_94878a62f5165bccd3cacffa05deb711_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4068
- 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:3432
- - 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\0000624E" 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:5916
  - - 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:248
  - - 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:3864
  - - 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:3208
  - - 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:356

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

0000624E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000624E
Size 48KB
SHA256 7e014f5e6e2b536c19cd62f8c4e2e2ecef8b9c2b3b39bf408a64929b7672b147
MD5 4a802fabb13a4ab1ffd72ae497818988
SHA1 170699376c245c7ddc0f18e9f5f07e053441cf2f
SHA512 1a17d2af561888f533fa942555f0f16dbb30004b7669fcfe0510019c3343545b970d291c5536cf31cd4ca940c41bdb4e56d048b6b26c62c7c5f0873340ad7990
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8v:bLy2Kerc64CiGImav42j03
TLSH
T192234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 b31b9124a3776ab20bd91e6bed38345ad82fa8b94e3665317131174561d9e335
MD5 94878a62f5165bccd3cacffa05deb711
SHA1 64239928cdae2d24c7bf154f7c08489b8cfc94dc
SHA512 6b92ea6eeb2b2d024ff4ece9f50c543f5865b36d05c6df27f2d56708672f5a59e948e039152d0149aaa91a081e7a5c6b53587590d868e178e6f252aa0a3179e0
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8+:bLy2Kerc64CiGImav42j02
TLSH
T110234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/356-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/356-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3432-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4068-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4068-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads