juko | a05b414d2b2f44ebea882b5ae3e333d940d56ce904c4288349c95b7a41eea6f0

General

Target
2026-07-27_e44c345b925e3903d9db915f2aab13ba_elex_wannacry.exe
Size 87KB
Sample260727-2mlydssfjc
SHA256 a05b414d2b2f44ebea882b5ae3e333d940d56ce904c4288349c95b7a41eea6f0
MD5 e44c345b925e3903d9db915f2aab13ba
SHA1 1118505ac304f329ccc0ee470803c46c223c1f90
SHA512 2dbf6c3de779bd38072479b29f5d8b829606278e3db45213d47e2f93bae1fa599baa543bdfc2f1f1930817edf91adbe7db14d4407adbd7f0d97154e8995bb96b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpD:2Ly2Kerc64CiGIm1K851YO6EQkwpD
TLSH
T1D293A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
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 8 IoCs

resource	yara_rule
behavioral1/memory/4524-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00100000000243e0-5.dat	family_juko
behavioral1/memory/2228-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4524-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2228-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0009000000024492-16.dat	family_juko
behavioral1/memory/1468-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1468-19-0x0000000000400000-0x0000000000425000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-07-27_e44c345b925e3903d9db915f2aab13ba_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2228	WINWORD.exe
1468	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-1-5-21-2937465464-4167303362-2236413517-1000\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
1472	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	2026-07-27_e44c345b925e3903d9db915f2aab13ba_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
1472	cmd.exe
3492	PING.EXE
3016	PING.EXE
756	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3492	PING.EXE
3016	PING.EXE
756	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4524 wrote to memory of 2228	4524	2026-07-27_e44c345b925e3903d9db915f2aab13ba_elex_wannacry.exe	84
PID 2228 wrote to memory of 1472	2228	WINWORD.exe	85
PID 1472 wrote to memory of 3492	1472	cmd.exe	87
PID 1472 wrote to memory of 3016	1472	cmd.exe	88
PID 1472 wrote to memory of 756	1472	cmd.exe	91
PID 1472 wrote to memory of 1468	1472	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-27_e44c345b925e3903d9db915f2aab13ba_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_e44c345b925e3903d9db915f2aab13ba_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4524
- 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:2228
- - 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\00007FA2" 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:1472
  - - 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:3492
  - - 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:3016
  - - 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:756
  - - 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:1468

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

00007FA2

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007FA2
Size 87KB
SHA256 510d6deb986816d94e4b440a1c5ccdc8ad1940db6ea648b2eb424a740dcc744e
MD5 8aab2732d75eb281c86c539a689f1a79
SHA1 c07713aa01b86e9c66c61ca95067f096347efbf7
SHA512 71bedbb19db08559804a66f74a44ceea7a396402132332fae57d7d4924bec92b9abfac46614b32879b91c2b4b37b0b78bee83a9c734d2c415e972b07005af572
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpi:2Ly2Kerc64CiGIm1K851YO6EQkwpi
TLSH
T1DD93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 a05b414d2b2f44ebea882b5ae3e333d940d56ce904c4288349c95b7a41eea6f0
MD5 e44c345b925e3903d9db915f2aab13ba
SHA1 1118505ac304f329ccc0ee470803c46c223c1f90
SHA512 2dbf6c3de779bd38072479b29f5d8b829606278e3db45213d47e2f93bae1fa599baa543bdfc2f1f1930817edf91adbe7db14d4407adbd7f0d97154e8995bb96b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpD:2Ly2Kerc64CiGIm1K851YO6EQkwpD
TLSH
T1D293A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1468-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1468-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2228-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2228-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4524-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4524-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads