juko | af3f789002694fc607910bc8c91d55057b873bd335f35c45e5aadefee2cdc26e

General

Target
2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe
Size 87KB
Sample260426-tx2gtsfs2m
SHA256 af3f789002694fc607910bc8c91d55057b873bd335f35c45e5aadefee2cdc26e
MD5 0dc5d591036dd3eeb3f9529bb6de6e28
SHA1 ab1b1fbf7b591e81011c923c29d33a26f1d75093
SHA512 cb98bbc691c6544386efc92ea192a259b66b46e492d5a7abb4e98cc1fe86aa2622b0bbe780abb691db9b32248f5d77ad06ef47ea680ad6b636d90f0db2d9f2d0
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpm:2Ly2Kerc64CiGIm1K851YO6EQkwpm
TLSH
T15493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/4408-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x002100000002b101-5.dat	family_juko
behavioral2/memory/4408-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2648-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001f00000002b28f-15.dat	family_juko
behavioral2/memory/2992-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2992-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2648	WINWORD.exe
2992	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-1-5-21-1383858298-2057492509-1726743289-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_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

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
4592	PING.EXE
3204	PING.EXE
4888	cmd.exe
2524	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2524	PING.EXE
4592	PING.EXE
3204	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4408 wrote to memory of 2648	4408	2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe	80
PID 2648 wrote to memory of 4888	2648	WINWORD.exe	81
PID 4888 wrote to memory of 2524	4888	cmd.exe	83
PID 4888 wrote to memory of 4592	4888	cmd.exe	84
PID 4888 wrote to memory of 3204	4888	cmd.exe	85
PID 4888 wrote to memory of 2992	4888	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4408
- 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:2648
- - 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\00005284" 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:4888
  - - 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:2524
  - - 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:4592
  - - 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:3204
  - - 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:2992

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

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

00005284

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005284
Size 87KB
SHA256 f9cbd69ea1f59fa5d9d75ca0593b2c7b36446af6de769ce910b52421efe1aeb9
MD5 c6b4191ed33cce95d297473f5d91d75d
SHA1 a8d0817ac7c0ae866265b213d299de3d779d10f8
SHA512 03ede0f138fd7c1917d41aa9a1ec63382ac2c577a86cc82c2d545fe5f8f9143a0ca9fe2386fa5af073f44c5c33fa660a6e169143ec779d04bc36fe864120f737
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T15493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 af3f789002694fc607910bc8c91d55057b873bd335f35c45e5aadefee2cdc26e
MD5 0dc5d591036dd3eeb3f9529bb6de6e28
SHA1 ab1b1fbf7b591e81011c923c29d33a26f1d75093
SHA512 cb98bbc691c6544386efc92ea192a259b66b46e492d5a7abb4e98cc1fe86aa2622b0bbe780abb691db9b32248f5d77ad06ef47ea680ad6b636d90f0db2d9f2d0
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpm:2Ly2Kerc64CiGIm1K851YO6EQkwpm
TLSH
T15493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2648-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2992-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2992-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4408-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4408-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads