juko | 1406ef27b082992aff37a63013fa00817b837fbe126d785f19fdc2bf5c71cf26

General

Target
2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe
Size 53KB
Sample260511-jbc71acx3w
SHA256 1406ef27b082992aff37a63013fa00817b837fbe126d785f19fdc2bf5c71cf26
MD5 385a91c809f23d4e71925272c86eca25
SHA1 c04a4dfe620addf80667e50dd2ec1dfc1a04f5f2
SHA512 def6a501a7427e7c5b37a40bf5a47875f48b88a32a274cd09c0e77682af7f6164f8921554b85e3b6d651b34219287b98a6ce6a9e197fe73b08873a034077ee47
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2q:3Ly2Kerc64CiGIm1tcBMUOOFq
TLSH
T1E3335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral1/files/0x000e00000001e6c9-4.dat	family_juko
behavioral1/files/0x000800000002441a-14.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4436	WINWORD.exe
460	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-1-5-21-914486190-3969805341-592249730-1000\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

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.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
5260	PING.EXE
4460	PING.EXE
3412	PING.EXE
1884	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5260	PING.EXE
4460	PING.EXE
3412	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 4436	4364	2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe	85
PID 4436 wrote to memory of 1884	4436	WINWORD.exe	86
PID 1884 wrote to memory of 5260	1884	cmd.exe	88
PID 1884 wrote to memory of 4460	1884	cmd.exe	89
PID 1884 wrote to memory of 3412	1884	cmd.exe	90
PID 1884 wrote to memory of 460	1884	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_385a91c809f23d4e71925272c86eca25_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4364
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4436
- - 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\00003BFD" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1884
  - - 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:5260
  - - 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:4460
  - - 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:3412
  - - 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:460

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00003BFD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BFD
Size 53KB
SHA256 e5982a82d9d9686d3dd0e2a91e6226a7e76622795605c006894bcc7105d410a4
MD5 8bc2b44b2bcc814baff4e2085bbe7cab
SHA1 3ad1ed8c43613f97987aa35a2b27bfb9a57c85ea
SHA512 b59e89eabb4ff1a3a5b8f0902ef3fccd9340a49fb248814c7ff7d695b178d1bbb61472884629287d7d20914e08375c89cc9239c062dd220ed43e69fd1f293bb5
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2r:3Ly2Kerc64CiGIm1tcBMUOOFr
TLSH
T1D4335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 1406ef27b082992aff37a63013fa00817b837fbe126d785f19fdc2bf5c71cf26
MD5 385a91c809f23d4e71925272c86eca25
SHA1 c04a4dfe620addf80667e50dd2ec1dfc1a04f5f2
SHA512 def6a501a7427e7c5b37a40bf5a47875f48b88a32a274cd09c0e77682af7f6164f8921554b85e3b6d651b34219287b98a6ce6a9e197fe73b08873a034077ee47
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2q:3Ly2Kerc64CiGIm1tcBMUOOFq
TLSH
T1E3335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/460-16-0x0000000002BB0000-0x0000000002C46000-memory.dmp

Download

memory/460-18-0x0000000002BB0000-0x0000000002C46000-memory.dmp

Download

memory/4364-11-0x00000000024D0000-0x0000000002566000-memory.dmp

Download

memory/4436-13-0x00000000024E0000-0x0000000002576000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads