juko | 46828be7cddfb8bc4e6eb42cde06dca98327e60888145b460017296c4e086d8b

General

Target
2026-08-30_0cd77afc11383d6c92b0110c6940af4a_elex_wannacry.exe
Size 94KB
Sample260830-1stprasyfw
SHA256 46828be7cddfb8bc4e6eb42cde06dca98327e60888145b460017296c4e086d8b
MD5 0cd77afc11383d6c92b0110c6940af4a
SHA1 2b62d9de59025088c5859f0e0c209932493abfcd
SHA512 59c6052a5f1702ddff7c38def51aad3203361cc3cc32d856d1953624f7f06dec89bc755c69a974ab4b032aa678a8688626e8b20bc506d8367690c9dfb59773fc
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nj:RLy2Kerc64CiGImFYgUBWTb4/Nj
TLSH
T114937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/3376-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000d00000002434e-5.dat	family_juko
behavioral1/memory/2000-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/3376-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2000-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000900000002465a-16.dat	family_juko
behavioral1/memory/3780-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/3780-19-0x0000000000400000-0x000000000042B000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-30_0cd77afc11383d6c92b0110c6940af4a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2000	WINWORD.exe
3780	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-1-5-21-668679576-120646659-2289335452-1000\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
3860	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	2026-08-30_0cd77afc11383d6c92b0110c6940af4a_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
3860	cmd.exe
4056	PING.EXE
4696	PING.EXE
1696	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4056	PING.EXE
4696	PING.EXE
1696	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3376 wrote to memory of 2000	3376	2026-08-30_0cd77afc11383d6c92b0110c6940af4a_elex_wannacry.exe	85
PID 2000 wrote to memory of 3860	2000	WINWORD.exe	87
PID 3860 wrote to memory of 4056	3860	cmd.exe	89
PID 3860 wrote to memory of 4696	3860	cmd.exe	90
PID 3860 wrote to memory of 1696	3860	cmd.exe	91
PID 3860 wrote to memory of 3780	3860	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-30_0cd77afc11383d6c92b0110c6940af4a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_0cd77afc11383d6c92b0110c6940af4a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3376
- 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:2000
- - 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\00004D23" 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:3860
  - - 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:4056
  - - 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:4696
  - - 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:1696
  - - 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:3780

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

00004D23

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004D23
Size 94KB
SHA256 4f86266cc817e298479fb6ff66f0e80bc9d047b9673963db46c34cff0361712b
MD5 40e4309d80a19cd479f48a1a9c8dd5d4
SHA1 f5b69b9007c1adefc5da67d606ba08b94911f0f5
SHA512 d11d7c734b02113837f2776c20582f569b49c04a749f4dd0385c28b98c4bc3d81ace3a14fe05aa4cd0f549100cf8a410dfd65a56cc4063d7df56ee9596079f0c
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NL:RLy2Kerc64CiGImFYgUBWTb4/NL
TLSH
T191937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 46828be7cddfb8bc4e6eb42cde06dca98327e60888145b460017296c4e086d8b
MD5 0cd77afc11383d6c92b0110c6940af4a
SHA1 2b62d9de59025088c5859f0e0c209932493abfcd
SHA512 59c6052a5f1702ddff7c38def51aad3203361cc3cc32d856d1953624f7f06dec89bc755c69a974ab4b032aa678a8688626e8b20bc506d8367690c9dfb59773fc
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nj:RLy2Kerc64CiGImFYgUBWTb4/Nj
TLSH
T114937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2000-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2000-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3376-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3376-13-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3780-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3780-19-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads