juko | 075ddef2b8457cf4670ed13825b0b1fa6157b99b3714849feb0778130e26428c

General

Target
2026-08-03_59f690f7e159789957777d4303668547_elex_wannacry.exe
Size 37KB
Sample260804-nztbcaygrg
SHA256 075ddef2b8457cf4670ed13825b0b1fa6157b99b3714849feb0778130e26428c
MD5 59f690f7e159789957777d4303668547
SHA1 b2e89887c24efbdf519fbece6ff88b4c1fcb8748
SHA512 094e6830ab4522c96cfa9eb7d4b3f7d1b7237ec5b205dec888a78cf273a8fd3cb892c26c8c0f86777593d0002d15e74db1b1ea2ef8340f75854caa430d3e937c
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaK:3LsF2Kerc64sTiX2IV0DhuogwV
TLSH
T103035C1A299160A2D55310B0E9D82FB4C53D8C76106BB066F740BE59A8B3CD7DF72BCE
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/4192-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000a000000011374-5.dat	family_juko
behavioral2/memory/4192-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5808-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c48b-13.dat	family_juko
behavioral2/memory/3792-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3792-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5808	WINWORD.exe
3792	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-1-5-21-2115213192-531537726-3295841909-1000\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
4348	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-03_59f690f7e159789957777d4303668547_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

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
1208	PING.EXE
4348	cmd.exe
5296	PING.EXE
3384	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5296	PING.EXE
3384	PING.EXE
1208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4192 wrote to memory of 5808	4192	2026-08-03_59f690f7e159789957777d4303668547_elex_wannacry.exe	89
PID 5808 wrote to memory of 4348	5808	WINWORD.exe	90
PID 4348 wrote to memory of 5296	4348	cmd.exe	92
PID 4348 wrote to memory of 3384	4348	cmd.exe	93
PID 4348 wrote to memory of 1208	4348	cmd.exe	94
PID 4348 wrote to memory of 3792	4348	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_59f690f7e159789957777d4303668547_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_59f690f7e159789957777d4303668547_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4192
- 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:5808
- - 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\00004ABD" 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:4348
  - - 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:5296
  - - 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:3384
  - - 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:1208
  - - 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:3792

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

00004ABD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004ABD
Size 37KB
SHA256 2513529225041b9c7c075b958653bbe2c9760f1e23b48445fce9d10dd8722ac1
MD5 c5e3968cf1853c378039f1aa8a369787
SHA1 2653f2f35cbaf7b141910b6c97b334b4f6ff90ac
SHA512 ecd2ce3116571893c9340d8cf5c783adf1c6c234f623148dfbaf7042d19d99906a703ced5ac27d835ae881e71441c0345c065f8719f0d44f8d6ebdbcb8546073
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywao:3LsF2Kerc64sTiX2IV0DhuogwL
TLSH
T1B5035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 075ddef2b8457cf4670ed13825b0b1fa6157b99b3714849feb0778130e26428c
MD5 59f690f7e159789957777d4303668547
SHA1 b2e89887c24efbdf519fbece6ff88b4c1fcb8748
SHA512 094e6830ab4522c96cfa9eb7d4b3f7d1b7237ec5b205dec888a78cf273a8fd3cb892c26c8c0f86777593d0002d15e74db1b1ea2ef8340f75854caa430d3e937c
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaK:3LsF2Kerc64sTiX2IV0DhuogwV
TLSH
T103035C1A299160A2D55310B0E9D82FB4C53D8C76106BB066F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3792-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3792-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4192-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4192-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5808-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads