juko | 2e40cfca4942832960b837272da7736449874429e0e2293565d6d0738eb37e1a

General

Target
2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe
Size 57KB
Sample260730-gp2fmsvsgs
SHA256 2e40cfca4942832960b837272da7736449874429e0e2293565d6d0738eb37e1a
MD5 0dc62f6db47590b6ce801b79dc1a0f5a
SHA1 6e05c7ede7d1a76696dbe34ee0220e6e3d9184cc
SHA512 46ad96863f84daae32cfef3a378fa2ddd6318c13b82d34fcda4e9ae56cb7da0fbe96f9cc7fec2b5743cf04f8e2ee9102649a82e97cde54a40e33920b940c24f5
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqab:wLy2Kerc64CiGImEsoDfab
TLSH
T192433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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
behavioral1/memory/4324-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x000b000000024328-5.dat	family_juko
behavioral1/memory/4324-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/4916-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x00090000000245a0-15.dat	family_juko
behavioral1/memory/4804-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/4804-18-0x0000000000400000-0x000000000041F000-memory.dmp	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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4916	WINWORD.exe
4804	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-1-5-21-1074038928-2032447174-945360078-1000\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
1616	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	2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_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
2212	PING.EXE
1616	cmd.exe
4100	PING.EXE
1524	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4100	PING.EXE
1524	PING.EXE
2212	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4324 wrote to memory of 4916	4324	2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe	85
PID 4916 wrote to memory of 1616	4916	WINWORD.exe	86
PID 1616 wrote to memory of 4100	1616	cmd.exe	88
PID 1616 wrote to memory of 1524	1616	cmd.exe	91
PID 1616 wrote to memory of 2212	1616	cmd.exe	94
PID 1616 wrote to memory of 4804	1616	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_0dc62f6db47590b6ce801b79dc1a0f5a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4324
- 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:4916
- - 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\00007ECC" 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:1616
  - - 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:4100
  - - 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:1524
  - - 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:2212
  - - 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:4804

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

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

00007ECC

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007ECC
Size 57KB
SHA256 bcc1b0e3c8eaffcc18f1026b306e04fc2608f9c8d7d4cae1912b9d0ad24c9db3
MD5 d5537009a19594c2a3720c4dc8f93cbc
SHA1 efc6228befc2a71d7245fb2b7fb5270093e9d6ab
SHA512 3549d0a43df5615a3724eed3926055304b8e530768c88d1bd515a4c76236cfcc9d2fcf9905cddd1d05fbcb6054435b240ecd507282b102acfb4affebfde92423
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqav:wLy2Kerc64CiGImEsoDfav
TLSH
T13D433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 2e40cfca4942832960b837272da7736449874429e0e2293565d6d0738eb37e1a
MD5 0dc62f6db47590b6ce801b79dc1a0f5a
SHA1 6e05c7ede7d1a76696dbe34ee0220e6e3d9184cc
SHA512 46ad96863f84daae32cfef3a378fa2ddd6318c13b82d34fcda4e9ae56cb7da0fbe96f9cc7fec2b5743cf04f8e2ee9102649a82e97cde54a40e33920b940c24f5
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqab:wLy2Kerc64CiGImEsoDfab
TLSH
T192433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4324-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4324-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4804-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4804-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4916-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads