juko | ffbe59fc42cef45a6c5bbb52d58f4c03e0a0a809b08840af4b84521d978e5421

General

Target
2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe
Size 48KB
Sample260802-egeksscg33
SHA256 ffbe59fc42cef45a6c5bbb52d58f4c03e0a0a809b08840af4b84521d978e5421
MD5 d8446e349cc1bd145f8c768fbe15fc08
SHA1 3eb53f8e85a0be21f41518591f7e35b658323a6f
SHA512 a2872269ef4d5fbc8775397de698c0aa9a3fef3e468db743dc03f0801632463e3d5b0249c8b676ebf501713debdba6bdb680694b0adbb36925fa606616179ce5
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8s:bLy2Kerc64CiGImav42j0k
TLSH
T1B8234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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
behavioral2/memory/6812-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00170000000118ee-5.dat	family_juko
behavioral2/memory/6812-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4828-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c00000001c6e6-13.dat	family_juko
behavioral2/memory/3880-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3880-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4828	WINWORD.exe
3880	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-1-5-21-1014449518-1831897916-4205727055-1000\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
3500	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_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
4916	PING.EXE
3500	cmd.exe
860	PING.EXE
828	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4916	PING.EXE
860	PING.EXE
828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6812 wrote to memory of 4828	6812	2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe	90
PID 4828 wrote to memory of 3500	4828	WINWORD.exe	91
PID 3500 wrote to memory of 860	3500	cmd.exe	93
PID 3500 wrote to memory of 828	3500	cmd.exe	94
PID 3500 wrote to memory of 4916	3500	cmd.exe	95
PID 3500 wrote to memory of 3880	3500	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_d8446e349cc1bd145f8c768fbe15fc08_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6812
- 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:4828
- - 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\00003ED1" 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:3500
  - - 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:860
  - - 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:828
  - - 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:4916
  - - 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:3880

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

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

00003ED1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003ED1
Size 48KB
SHA256 7b34f3e8e858467c768c6036bd4906bec3fe3e4b92df1f8c697d196336245f65
MD5 920f5898d663590d08d8a9cf69ef5767
SHA1 6d9595fe0b44331548fe6e58ae8356cd186a1c38
SHA512 f436c4d8e8263a59cb61c5ae7148e8ed6eb57435d537c03a56766c196f4de0bc8cab0a724d26d909b3e933c42141f7fd1e1a139c2d00029709e9ded5fefea694
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0f
TLSH
T195234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252D76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 ffbe59fc42cef45a6c5bbb52d58f4c03e0a0a809b08840af4b84521d978e5421
MD5 d8446e349cc1bd145f8c768fbe15fc08
SHA1 3eb53f8e85a0be21f41518591f7e35b658323a6f
SHA512 a2872269ef4d5fbc8775397de698c0aa9a3fef3e468db743dc03f0801632463e3d5b0249c8b676ebf501713debdba6bdb680694b0adbb36925fa606616179ce5
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8s:bLy2Kerc64CiGImav42j0k
TLSH
T1B8234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3880-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3880-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4828-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6812-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6812-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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